6/2002 WIND BLATT 1
The ENERCON Magazine
Inspection clause dropped
Pages 2/3: Under stress
E-112 blade on the test stand
Pages 4/5: In the bath
New impregnation for generators
Pages 8/9: Under discussion
E.ON grid expert on connection rules
2 WIND BLATT 6/2002
With the national election behind us,
we face a new situation, and we must
again focus clearly on the future.
The election has shown us all that
wind power, as the principal dynamo
of the renewable energy sector, has
grown into an industry that no political
party can afford to ignore. There are
many reasons for this: innovative re-
search trends, permanent jobs, a
comeback for the old economy, thriving
small and medium-sized supplier The test stand on the banks of the Weser.
companies, and the worldwide
admiration for German technology.
Of course, there are still weak points,
such as shady investment funds and
commercially dubious companies and 260 tonne test stand built at SAM
projects. But these undesirable develop-
ments are also an opportunity to learn
a lot, a point of particular relevance to An E-112 rotor blade is over 52 m ver’s eye. At one end a rotor blade is
the discussion surrounding insurance flanged, tilted up at an angle of 10 de-
long and weighs 20 t, and its
(see the article on pages 6/7). grees to the ground, raising its tip to-
test stand is an equally impressive wards the sky.
When I look back over the closing year, structure. It weighs 260 t and
I think of these things: catastrophic The root of the E-112 blade is firmly
represents a huge investment,
floods, drought, climate change and clamped, and the blade itself is pulled
Johannesburg. This underlines to me contributing to the maintenance towards the ground at six locations,
that there is no future without the looking more and more like a loaded
of ENERCON’s high quality
environment. Renewable energy sources
catapult. The tension gradually becomes
are facing a great challenge. They bear standards.
visible, and a slight curve can be seen.
a huge responsibility, as an energy
The stress is now 150 percent of the
supply system capable of satisfying
the needs of the future is developed.
Let us seize this opportunity!
With these thoughts I wish you a joyful
T he August sunshine beats down
on the remote airfield at the ASL
site on the banks of the Weser. A heavy,
maximum load to be expected in opera-
tion. The stress test described here is
one of four tests to which the blade
Christmas and a happy and healthy white steel structure catches the obser- was subjected before it was allowed to
new year. travel by ship to the
prototype wind energy
Yours, converter at Egeln. All
three blades were put
through the stress test.
For ENERCON develop-
ment engineer Rolf
Rohden this is a matter
of ENERCON GmbH
of course. “We simply
want to ensure that
Cover photograph: Timmeler Kampen Results of the blade deflection measurements, showing a minimal devia- every blade is absolute-
tion between the measured (points) and calculated (line) values. ly faultless, because it is
6/2002 WIND BLATT 3
Photomontage showing the loaded and unloaded E-112 blade on the test stand.
on the test stand
one of the most safety-critical compo- characteristics were analysed at Lem- Dr. Dieter Jahn, responsible for special
nents in a wind energy converter”, he werder. wind sector projects at SAM in Magde-
says, adding that, after all, an aircraft’s burg, manufactured the test stand, de-
wings are subjected to a long series To investigate the resonant frequency, the veloped by ENERCON engineers, using
of tests before they are first used. blade on the test stand was made to principles derived from bridge con-
Apart from the stress test, the deforma- oscillate. The ENERCON engineers were struction. He also developed the mighty
tion, resonant frequency and elongation pleased with the result: the data returned steel substructure of the E-112 nacelle
by the vibration sensors for the trial set-up at the Sket factory.
agreed with the calcu- Dr. Jahn explains the benefits of the blade
lated values. Nor did the test stand: “The whole installation is
other results differ sig- neither fixed to the ground nor welded,
nificantly from those de-
but is entirely bolted. It can therefore
easily be dismantled and reassembled.”
the blades withstood the
It is also possible to use a pitch motor
stress test without any
to turn a rotor blade by up to 180
damage, and the defor-
degrees. In this way the blade can be
mation of the E-112
turned on both sides for testing, and can
blade was found to be
be brought into exactly the desired
within the usual tole-
rance of one or two
percent of the calcula-
ted values. Wire strain The operating behaviour of the E-112
gauges were attached rotor blades is at present being investi-
at the relevant points of gated on the converter in Egeln. The re-
the internal structure of sults of this and other tests being carried
the blade to analyse the out on the prototype will be published
elongation. The results in a forthcoming issue of WINDBLATT. In
of this investigation will the meantime, the E-112 has demon-
be utilised for the con- strated its rated power of 4.5 megawatts
tinuing development of under suitable wind conditions several
Resonant frequency measurements:
time curve (above), frequency amplitudes (below). the blade structure. times.
4 WIND BLATT 6/2002
Resin like honey
New impregnation process for generator manufacture
he generator is impregnated with East Frisian town of Aurich. The air is preliminary heating oven to the resin
T a resin in a specially manufac-
tured vacuum impregnation plant. The air
fresh, and contains no solvent vapours.
And instead of the five generators, con-
bath. Thorough application of resin is now
achieved by capillary force instead of a
trapped in the coils is evacuated, so that sisting of rotor and stator, that were vacuum. This is made possible because
resin flows into even the smallest crevice handled each week in 1995, it is now the new resin liquefies when hot. “In fact
in the windings.” These words are from a possible to apply resin and corrosion the resin behaves rather like honey at this
description of the new impregnation hall protection to 25 in the same time, since stage”, explains Cord Druivenga. As soon
at ENERCON Induction in 1995, at which the entire coating process has been as it comes into contact with the hot
time Dipl.-Ing. Cord Druivenga had been reduced from 20 hours to five. The copper winding, the resin, which was
working at ENERCON for just under coating of the generator parts consists, viscous at room temperature, liquefies
two years. “At that time the first automa- now as then, of two components with completely. After a few minutes the
tic generator impregnation plant seemed different tasks: while the resin impreg- generator is removed from the bath, and
like a miracle of technology”, he recalls. nation stabilises the copper windings, the the resin has been deposited as a jelly-
covering coat of varnish provides reliable like layer on the copper windings. When
Today, though, the development of an corrosion protection. the generators were manufactured using
improved process has ushered in a new the old vacuum impregnation process,
era at ENERCON Induction. It puts the Cord Druivenga walks enthusiastically between 20 and 30 percent drip losses
technological capabilities of the past through the hall, climbs over the edge of and 43 percent volatile solvent loss were
into the shade, is environmentally more a stator ring deposited on the floor, and normal. The figures are now just five
friendly, faster, and delivers even higher examines the material so closely that he percent drip losses and up to three
quality coatings. almost hits his nose against it. “You can percent evaporation loss. But with each
see it quite clearly here. The resin is much immersion, nearly 90 percent more resin
No spots of red paint disfigure the new, more evenly applied than before”, he is taken up by the generator. “This gives
gleaming white hall at the factory in the remarks with satisfaction. us an improvement in quality. Fewer voids
are formed as the resin is applied, and
The secret of the new this gives the windings greater stability”,
process is to connect comments Matthias Dutsch, managing
the stator and rotor to director at ENERCON Induction.
an electric circuit for
the impregnation with As manufacturers of wind energy con-
stabilising resin, sup- verters, ENERCON themselves aim to
plying sufficient energy achieve the less polluting production
to raise the tempe- possible. The need to use substances
rature of the copper containing solvents was therefore always
winding to 135 degrees a thorn in the side of ENERCON’s boss,
Celsius. This is done Dipl.-Ing. Aloys Wobben. But it was only a
inside an enormous few years ago that environmentally
forced-air oven that friendly resins with the necessary pro-
simultaneously heats perties came onto the market. ENERCON’s
the steel components development department then immedi-
of the rotor or stator ately began to design a new impregnation
ring to about 100 de- process.
ENERCON engineer Roland Schulz has
A factory crane carries investigated the matter of electrical
The new impregnation bath the parts from the power supply to the generator compo-
6/2002 WIND BLATT 5
Matthias Dutsch, managing director at ENERCON Induction, checks an E-66 stator that has just come from powder coating.
nents. He stands in front of an entire wall for insulation, even when the old process While the new process was still in its
of control cabinets in the new impreg- was still being used. The red top coat, test phase at Wobben Research and
nation hall, and explains: “To heat the however, also contained 45 percent Development, the laying of the foun-
E-66 stator electrically, for instance, a solvent. Annoying side effects included dation stone for the new production hall
direct current of 1,400 amps is needed.” spattered work clothes and rust-red spots was being celebrated at the other end
And because, from E-30 to E-66 stator over the whole impregnation hall. The new of Aurich. A total of 2.75 million euros
and rotor, eight different objects have to powder ﬁnishing varnish in a discreet pale has gone into the 860 m2 structure.
be impregnated, there are also eight grey avoids these unpleasant side-effects Even as the resin and powder suppliers
different DC currents required, which altogether. were still shaking their heads in doubt,
basically come from a single transformer the new impregnation hall at ENERCON
with the appropriate taps. While it is true Following the resin bath, components are was daily moving step by step closer
that heating the generators consumes a ﬁrst returned to an oven, where the winding to becoming a reality. At the same
large amount of energy in a short time, temperature is raised to 190 degrees by time, tests were being carried out in
this must be seen in the light of the enor- supplying it with electrical power, while the ENERCON’s Research Department on
mous time-saving. other components are heated by con- coils for the power cabinets. They too
vection. This causes the resin to harden were to be treated using the new im-
The additional robust insulation of the irreversibly.The residual heat is exploited as pregnation process and subsequent
generators is crucial for a long service the subsequent powder coating is applied. powder coating. Since then, ENERCON
life in damp and sometimes salty air. In a closed chamber, ten automatic spray have developed a fully automatic
ENERCON’s production equipment de- guns await the hot, grounded generator to coating plant for them, and installed it at
signers, of whom Cord Druivenga is one, cover it with epoxy powder. “The new top Magdeburg-Rothensee as well as at
developed impregnation processes and coat is not just cleaner, but also gives Aurich.
drying ovens in the early 1990s with the improved protection against moisture and
aid of which the salt-resistant finishing corrosion, since the powder allows the Cord Druivenga: “It does take some
varnish penetrates even into the inter- layer thickness to be doubled”, explains courage to convert production to an
stices between the generator’s copper Mr Dutsch with pleasure. Whereas in the entirely new process. And there were
windings. In this way, the ENERCON ring past the liquid finishing varnish dripped plenty of sceptics. That makes it all the
generator significantly exceeded the re- away continuously, the powder coating now more satisfying that everything is now
quirements set by the industrial standard adheres tenaciously. functioning perfectly.”
6 WIND BLATT 6/2002
not for ENERCON
New policy conditions from insurers
Hard times have dawned fit one now would require the converter to last year due to gearbox damage, 4,500
be redesigned and the blades to be ex- because of electrical failures and 2,500 as
in the wind energy insurance
changed. a result of damaged rotor blades.
market. The insurance
companies are looking to Above all, however, it is the “inspection The disparity that has arisen as a result of
clause” that is currently making life so the reduced premiums was the trigger for
minimise their risk. difficult for the operators, and which is introducing the inspection clause that has
also to be found in Bookjans’ possible been included in all newly concluded
follow-on policy. The clause, agreed jointly contracts since August 2002. This trend
by the insurance companies, requires is going so far that it is difficult for the
M y insurer simply dropped a
cancellation letter in my letter-
box. And that after 10 years without a
specific servicing work and expensive re-
placements to be carried out on the wind
operators of certain converter types to get
any insurance cover at all.
single claim on the insurance for my energy converter if the insurance cover is
converters. That’s a downright cheek”, to be maintained. What Gerhard Bookjans The introduction of the clause was no sur-
exclaims Gerhard Bookjans from Hilken- angrily dismisses as “sheer blackmail” is prise to ENERCON’s insurance expert,
brook in Northern Germany angrily. When the result of increasingly fierce competi- Rainer Rehwinkel. He is aware that such
he bought an E-17 (80 kW) back in 1989, tion that has developed in the insurance clauses are a matter of course in many
he was one of the first to enter the wind market over the years. It would appear other sectors, like the insurance of large
sector. He insured the converter through that insurers can only compete if they of- production machines. “Furthermore”, he
LVM (Landwirtschaftlicher Versicherungs- fer ever lower premiums. This is against says, “it means that the quality of the
verein Münster), and this insurance rela- the background of an almost constant wind energy converters is maintained at a
tionship still exists. But he insured the claims rate of up to 180 percent in the consistently high level, or even in some
E-18 (80 kW) that he acquired two years machine failure sector and 300 percent areas improved.”
later through another company, whose for business interruption insurance. In
letter of cancellation has now reached Schleswig-Holstein alone, more than The clause contains four principal points.
him without warning. Nor are the alter- 10,000 operating hours were lost by the For rotor blades, it is required that after
natives on offer any real comfort to operators of 484 converters monitored 40,000 operating hours, or at the latest
the “windmill” ow- after five years, they
ner. Bookjans was The development of insurance premium rates for wind energy converters must be recondi-
offered a follow-on tioned, and must also
policy, but at condi- be visually inspected,
tions that look more including inspection
like a bad joke. A of the internal light-
lightning protection ning protection, once
system for rotor bla- a year. The gears,
des was, for instan- generator and main
ce, required. This may bearings must also
be standard nowa- be replaced af-
days, but the con- ter 40,000 operating
verters made in the hours, regardless of
early days of wind their condition, and
energy do not have the stator and rotor
The ﬁgures apply to full cover, with an excess of 1,000 euros per claim.
such a system, and to Quantity discounts and outline agreements are not considered in the premiums mentioned above. windings of the ge-
6/2002 WIND BLATT 7
nerator and the gear wheels must be Rehwinkel. The EPK, as a financially comprehensive machine insurance, may
examined. It is quite clear that implemen- stable factor, gives the operator better form the basis of a policy. One insurance
tation of the points required here re- planning security than any insurance company has already decided to offer this
presents a significant additional cost can. form of insurance against damage resul-
factor. In the meantime, insurers are ting from external influences in future,
working on an extension of their accept- There is another area where ENERCON without requiring lightning protection and
ance guidelines. This should make it scores highly. “We have now in fact without the inspection clause.
possible for the operator to take specific reached a point where a distinction is
measures, such as regular inspection of made between different converter types It is not just older converters that are being
the converter by an expert, to obtain a when the insurance risk is assessed, looked at very closely by insurers. The
modification of the contents of the in- and this works strongly in favour of prototypes of the new multi-megawatt
spection clause. The extent to which this ENERCON”, explains Mr Rehwinkel. generation of converters often encounter
might happen is not yet clear. Above all, the absence of a gearbox prone mistrust, since there are so many potential
to malfunctions has increased insurers’ uncertainties. Insurance was not a pro-
Since the ENERCON Partner Plan (EPK), trust in ENERCON converters. blem for the prototype of the 4.5 MW
chosen by more than 85 percent of all E-112 converter, however, especially as it
German ENERCON customers, already But what options remain open to the is already protected by the EPK. A partner
guarantees 97 percent availability, and operators of converters who neither have for the supplementary insurance was soon
includes regular servicing and mainte- an EPK nor are able to satisfy the con- found, and the inspection clause was also
nance work as well as any necessary re- ditions necessary to take out a new policy omitted.
pairs, the work specified in the clause is (higher premiums, larger excess, rotor
superfluous. For this reason, Gothaer, one blades with lightning protection and the The problem of insurance costs is also
of Germany’s largest insurers of wind en- inspection clause)? It is therefore par- familiar to some extent on the inter-
ergy, has decided to remove the clause ticularly the owners of smaller, older national wind market. It is Rehwinkel’s
from contracts whenever the EPK has converters who are asking themselves opinion that “foreign insurers will sooner
already been concluded. The Partner Plan whether, under these circumstances, or later take the same steps as the
thus protects operators from the in- insurance makes any sense at all. Mr German insurance companies”. Indeed
spection clause. “It is possible that in- Bookjans has already reached a decision: converter operators abroad already en-
surance premiums will rise further over “Under those conditions – thanks, but no counter the inspection clause when they
the coming years, but the insurance thanks.” So that these operators are not take out their insurance with a German
required in addition to the EPK will left out in the cold, ENERCON have been insurance company. It is, however, a
remain largely constant, because so far in discussion with a number of insurers, comfort for operators that ENERCON also
almost no claims have arisen in this with the result that, if there is interest, a offer the EPK, or a comparable scheme,
area”, is the opinion expressed by Rainer slimmed-down version, referred to as abroad.
8 WIND BLATT 6/2002
Wind energy is growing
faster than the grid
Dr. Uwe Radtke of E.ON on the new grid connection rules
Dr. Uwe Radtke is the coordinator more than 5,000 MW within our regula- Radtke: At 3,000 MW we reach the
tory zone. These are no longer just small critical limit for permissible failure within
for wind power in the grid planning
producers; they have long since reached the European UCTE grid. As soon as more
department at E.ON Netz GmbH. the dimensions of large power stations. than 3,000 MW fail, the grid frequency
The voltage is closely associated with the leaves the permissible range. If an even
He gives WINDBLATT his views
reactive power, and here we have now larger generation capacity were to fail, the
about the extensions to the grid specified a range corresponding to that of European UCTE grid might collapse. And if
large power stations. In addition, there is at that point we did not happen to have
connection rules that take effect
the question of the operating behaviour a balance between generated and con-
in January and apply to the on the grid when faults occur: in the past, sumed energy in the remaining grid, a
connection of wind energy the small converters left the grid as “blackout”, a collapse of the grid, could
quickly as possible when the voltage happen, with unforeseeable consequen-
converters to the E.ON grid. changed even a little. Nowadays the ces. This is a risk that would become in-
converters must remain connected if, for creasingly real as the amount of wind
instance, there is a short on the grid. power grows, if the new grid connection
WIND BLATT Dr. Radtke, what diffe- We need their short-circuit capacity for rules are not implemented.
rences are there in the grid connection the sake of system stability and grid pro-
rules for the operators of wind energy tection. WIND BLATT Have the wind energy
converters who feed power into the grid converter manufacturers already ap-
after the 1st January 2003? WIND BLATT And what happens when proached E.ON Netz and told them that
a short-circuit occurs now? they can supply appropriately equipped
converters after 1st January, so that the
Radtke: The converters must re- extensions to the grid connection rules
main on the grid because, with the can be observed?
large number of converters now con-
nected in North Germany, the capa- Radtke: We first approached the
city lost would soon pass the 3,000 MW FGW (Fördergesellschaft Windenergie –
mark. the Wind Energy Promotion Association)
in an attempt to make the technical
WIND BLATT So our lights would go requirements we must place on manu-
out? facturers of wind energy converters and
on project developers transparent. Manu-
Radtke: Well, not exactly. If power facturers have also had discussions with
generation capacity fails somewhere, then us regarding the implementation.
immediate assistance is drawn from other
Radtke: The new technical require- power stations within the European UCTE WIND BLATT And how far have the
ments primarily affect two physical pa- grid in order to substitute for the missing manufacturers come?
rameters: the frequency and the voltage. power. But the UCTE grid does not have
In the past, if the frequency wavered a more than 3,000 MW available for imme- Radtke: They are working on the task,
little, wind energy converters have auto- diate assistance. but have not told us how much progress
matically disconnected themselves from they have made.
the grid. We are now saying that the WIND BLATT So the problem is not
converters are to remain connected to the yet acute. If the megawatt capacity in- WIND BLATT What will happen if, by
grid, like large power stations, in order to creases in line with the growing number the beginning of January, the manu-
support it. We presently have wind energy of wind energy converters, then what will facturers are not yet able to deliver the
converters with an installed power of happen? necessary technology? What must an
6/2002 WIND BLATT 9
operator who wants to connect his con- ways depend on the results of a specific When the grid has been appropriately
verter to the grid expect? grid calculation – each case is examined expanded we will be able to accept 100
individually. The provision of sufficient percent of the wind power.
Radtke: We have a set of transitional reactive power ensures that as far as
grid connection rules which came into possible 100 % effective power is trans- WIND BLATT Doesn’t the Renewable
force back on 1st January 2002. From 1st mitted. This is why we say that the reac- Energies Law (EEG) specify that power
January 2003 they are binding for every tive power must be compensated locally companies must purchase wind power?
wind energy converter that is connected wherever possible, in order to minimise
to the grid. On the other hand, we must transmission losses. Radtke: That is correct, and the Power
say that it is not possible to test whether Industry Law (EnWG) obliges us to provide
a converter satisfies our requirements WIND BLATT E.ON’s new rules also a reliable supply. Wind power, like any
when it is commissioned. At the time of provide for a reduction in power from other power source, can only be accep-
commissioning, the operator of the wind wind energy converters if there is a risk ted and transmitted if this does not in-
farm must definitively declare that he that they will overload the grid. In other volve any risk for people or equipment,
satisfies our requirements. words, E.ON will itself throttle back the and if the reliability of the supply is not
converters. To what extent will a loss of compromised. The Renewable Energies
WIND BLATT But if the converter is not revenue occur? Law thus logically obliges grid operators
capable of doing this, the operator can’t to expand the grid if this is commercially
really make such a declaration ... Radtke: That is hard to say. In any reasonable. And whereas the installation
event, it is a random variable that might of further wind power capacity is racing
Radtke: If the converter is not capable amount to several hours in a year. For this ahead, expansion of the grid takes a great
of satisfying our connection rules, it must
not be connected to the grid. We have
suggested to the wind energy converter
manufacturers that they develop, in co-
operation with the test institutes, test pro-
cedures that will permit compliance to be
supported by appropriate measurements
and to be certified.
WIND BLATT But what would be the
legal consequences if a short circuit
actually happens and the operators of
converters newly connected to the grid case to arise it will always be necessary deal of time, in particular as a result of ap-
are not ready? for several different events to occur si- proval procedures. The politicians and ad-
multaneously. One is that we must be in a ministrators must do their homework here.
Radtke: If the converter operator does phase of strong winds, and the power de-
not satisfy the applicable grid connection mand in the grid must simultaneously be WIND BLATT How will power reduc-
rules, he is also responsible for any at a low level. At the same time it must be tions be documented in the E.ON Netz
consequential damage according to the very hot, because our operating equip- control rooms, so that the operators can
principle that he is the cause of that ment is designed for a particular ambient easily understand what has occurred?
damage. temperature. So there is a series of ran-
dom variables that must occur together Radtke: Instructions to reduce power
WIND BLATT Let us turn to another before a power reduction will take place. in the context of generation management
aspect of the grid connection rules: re- But it is certain that we will have to apply will be automatically documented in the
active power. Is it possible that the power this generation management, if only be- operational journals of the responsible grid
companies will be willing to permit addi- cause the necessary development of the control system.
tional converters above the maximum grid is not proceeding as fast as the addi-
limit of a wind farm’s rated output that you tion of wind energy converters. We are Editor’s comment:
have specified, if these are capable of assuming that the installed power from ENERCON’s development engineers have
preventing a voltage rise? wind converters in Germany and in the been looking into this problem for a con-
E.ON regulatory zone will double over the siderable time, and are well on the way to
Radtke: These decisions on the level next five years. We regard generation implementing E.ON’s requirements by the
of connected power for a wind farm al- management as a temporary measure. beginning of 2003.
10 WIND BLATT 6/2002
Data transmission with our own satellite dish: nowadays an everyday occurrence for ENERCON India.
India leads the way
High-tech solution for ENERCON’s Asian construction sites
urt Stürken, responsible for things are organised differently in India, leagues in Mumbai (formerly Bombay)
K ENERCON’s project manage-
ment division, is always on the move.
but the high ENERCON standard is imple-
mented here uncompromisingly”, was the
He supervises ENERCON’s project mana- praise offered by Mr Stürken. Kurt Stürken was nevertheless surprised
gement throughout the world. He re- to see a container with a satellite dish on
cently visited ENERCON India in order to Because of India’s sheer size, trans- the roof during his visit to the largest
find out more about the work of the local portation within the country can on occa- ENERCON construction site in the state of
project management team. Together with sion take a whole week. Accordingly, Karnataka, in the south of the country. His
his Indian colleague, K. H. Trivedi, he errors such as delayed, incomplete or first guess was that the dish belonged to
plans to intensify cooperation between incorrect deliveries cannot be corrected the Indian army’s military intelligence ser-
the parent company and the large Indian so quickly. vice. But when he saw ENERCON personnel
subsidiary. A far-reaching exchange of nearby, it dawned on him that it was simply
experience and knowledge is worthwhile, ENERCON India have been using the SAP a telephone connection to head office.
thanks to advanced communication tech- computer program for some time now to
nology. control working procedures. This German K. H. Trivedi explained the reason for this
software is one of the world’s most widely type of communication to the German en-
“I knew that our Indian colleagues were used systems for the management of fi- gineer. Regular problems on the telephone
well-organised, and did not need to fear nances, production, purchasing and other lines create problems for communication
technical comparison with ourselves. company processes. India is well-known with the production sites. At the same
Still, I was impressed by what I saw. Of for its IT expertise, and the enthusiasm time, however, it is important that the pro-
course, due to the huge distances, some for the subject is shared by our col- duction managers are informed in detail
6/2002 WIND BLATT 11
Construction of an ENERCON wind farm in the state of Karnataka.
about the progress of construction work on the system offers. This approach could be harmonisation of working methods and
access roads and foundations. K.H. Trivedi used in the future to increase productivity organisational structures. “It is our job
explains further: “In turn, we need to know in other countries. to provide even more support to our col-
when transporters have left the production leagues, and in India there is a great deal
locations, and we can also inform our col- ENERCON India does not just use the of interest in our expertise in terms of
leagues of the stocks available at the con- same SAP software as ENERCON in practical implementation. But we are
struction site.” The whole company, inclu- Germany, but also uses the Lotus Notes building a motorway in both directions
ding the service and marketing depart- communication system. This means that here, and we are preparing the ground
ments, is kept constantly informed about there are no difficulties in making the for worldwide implementation within the
the progress of construction so that em- German ENERCON databases available to ENERCON group”, is Kurt Stürken’s
ployees can optimise the flow of materials. India. And this significantly simplifies the summary.
Periods of waiting, if they do occur, are re-
cognised earlier and can be put to good use.
Another advantage of SAP is that the data-
base can also be used to exchange infor-
mation with a time delay. In contrast to a
telephone call, two parties are not simul-
taneously necessary for communication.
In view of the fact that in some regions it
can even be difficult to establish a fax
connection at the construction site, the
system used in India is opening up new
ways of working.
The project manager from Aurich is
highly impressed by the possibilities that Computerised construction container at the wind farm.
12 WIND BLATT 6/2002
A wind of change
in Stoiber country
ENERCON suppliers from Bavaria delighted by sales figures
Wind energy is popular in the home- went to Bavaria. ENERCON is supplied
by more than 150 companies in the
land of the politician Edmund Stoiber,
mountainous Stoiber country. WINDBLATT
leather shorts and thigh-slapping folk therefore surveyed some of the largest
dances. In Bavaria, wind conditions Bavarian suppliers on the subject of wind
energy and the economy. The questions
may not be ideal everywhere, but the we asked were:
region’s economy is benefitting all 1. How long have you worked
the more from the boom in the sector. for ENERCON?
2. What special knowledge in your
company is used here?
d uring 2001, ENERCON GmbH
alone paid more than 50 million
euros to suppliers in Bavaria. If the other
3. What proportion of sales were
attributable to ENERCON in 2001?
companies in the group are added, the 4. How important is this volume
figure exceeds 52 million euros. of business to your company?
5. How many jobs are sustained by
The proportion of purchases from Ba- the work you do for ENERCON?
varian companies amongst ENERCON’s 6. What potential do you see for your
suppliers speaks for itself: in 2001, six company through the expansion of
percent of the 800 million euros spent wind energy? IMO: Wind sector as engine of growth.
1. Gusstech have worked for ENERCON 1. IMO Industrie-Momentenlager Stoll 1. SKF have worked with ENERCON
since 1994. & Russ, based in the greater Nu- since development of the E-32 in
2. The comprehensive knowledge and remberg area, have been supplying 1989.
experience of our engineers, crafts- ENERCON since 1994. 2. The company offers expertise in the
men and technicians in the manufac-
ture of high quality castings. 2. IMO blade bearings must do their job ﬁelds of roller bearings – servicing –
24 hours a day, 365 days a year in lubrication – sealing – monitoring.
3. In 2001, about 30 percent of our sales
were to ENERCON. hundreds of E-40 and E-66 conver- 3. In 2001, SKF’s sales to ENERCON
4. ENERCON are our number one cus- ters. reached 3.2 million euros. This corre-
tomer by a large margin, as can be sponds to 0.1% of total group sales.
3. The medium-sized manufacturer of
seen from the sales ﬁgures.
large roller bearings has increased its 4. This business is very important to
5. About 30 jobs are secured by
deliveries to Aurich by a factor of SKF, particularly as ENERCON helps to
seven over the last seven years. ensuring full capacity of large bearing
6. If total sales to wind energy converter
manufacturers (approx. 35 percent) is production at Schweinfurt.
4. In recent years, wind energy has been
considered, and indirect supplies to our no. 1 growth sector, providing us 5. With the present sales volumes, we
gearbox manufacturers for such con- with double-digit growth. could assume 16-20 employees.
verters is added, then nearly 50 per-
cent of our sales is associated with 5. Today, ENERCON secures almost one 6. The wind sector offers enormous
wind energy. in ten of the 100 jobs at IMO.* growth and innovation potential.
6/2002 WIND BLATT 13
Walter Bau: Slipforming of a concrete tower. An SKF worker with a large bearing for a wind energy converter.
1. Walter Bau have worked for ENERCON 1. Epcos have been supplying ENERCON 1. FAG have supplied ENERCON since
since the spring of 1998. since 1998. 1986.
2. The following expertise is applied in 2. The development and manufacture of
2. Epcos is one of the world’s leading
our contracts: construction site logis- roller bearings is our speciality.
tics, manufacturing fully finished, producers of passive components.
3. The proportion of sales has been
cast-in-situ concrete towers for the ENERCON use energy stores such as
growing continuously, and is current-
E-66 simultaneously at different aluminium capacitors, power capaci-
ly around 2 million euros.
locations all over Germany, meeting tors and UltraCaps from Epcos.
ENERCON’s extraordinarily high qua- 4. In the context of activities in the wind
3. Sales to ENERCON last year reached energy sector, this is a very high and
lity demands, conical slipforming with
5 million euros. This makes ENERCON significant proportion. FAG’s world-
variable wall thickness, pre-stressed
steelwork in vertical bundles approx. one of the 10 largest customers in wide turnover in the industrial and
90 m long, special technology for slip- Germany. automotive sectors is more than
formed concrete. 2 billion euros.
4. ENERCON is an important customer,
3. Around 30 % of sales in 2001 at our 5. Work for ENERCON contributes to
whose innovations set landmarks.
Ingenieurbau München factory were FAG’s overall success (approx. 18,000
orders from ENERCON. 5. More than 20 jobs are secured by employees). One can certainly say
5. The work for ENERCON secures ENERCON. that several hundred jobs depend
approx. 140 jobs. directly or indirectly on sales to
6. The further development of renew-
6. The continued development of wind ENERCON.
able energy, and particularly wind
energy is creating potential in the 6. Overall, FAG see great potential, above
energy, is having a very positive effect
construction of cast-in-situ concrete all with the new generation of con-
towers for the home onshore sector, both on innovation and growth at the verters, such as ENERCON’s E-112.
construction of towers abroad and, in company. Epcos thus recorded above- There is a growth market here for
the medium term, in the offshore average market growth in double the roller bearing sector, even if the
sector.* ﬁgures. pressure on prices increases.
* Walter Bau gave no response to question 4, while IMO made no comment in respect of question 6.
14 WIND BLATT 6/2002
dominate the climate
An interview with climate expert, Prof. Dr. Stefan Rahmstorf
Climate researcher, Prof. Dr. Stefan physics, lead to a warming of the same connection between lung cancer and
order of magnitude as the one that we smoking, or the HIV virus as the cause of
Rahmstorf, of the University
have observed. Thirdly, we know of no AIDS.
of Potsdam explains to WINDBLATT other plausible reason that might explain
this warming. From time to time we hear WIND BLATT You not only study the
the state of affairs in climate speculation that the sun may have most recent changes in climate, but also
caused this warming. But the attempts to climatic events reaching far into the past.
research with reference to the
find such a correlation have all collapsed, How reliable is climatic data from the
human causes of warming. and have been found to be untenable – on past?
Rahmstorf: There is very good data
particularly for the last 420,000 years,
because we have data from ice cores
covering this period. There is also data
from deep-sea sediments reaching back
over many millions of years, but this of-
fers less accurate time resolution. There
is an astounding quantity of climatic data.
Wherever something has accumulated,
researchers find opportunities for analy-
sis: on the seabed, in layers of snow at
the polar ice caps, in the growth rings of
coral or trees, or in limestone caves. A
variety of isotopes and trace elements are
investigated in order to draw conclusions
about climate change in the past. For
WIND BLATT Prof. Rahmstorf, the the basis of sunspot activity, the climate
example, it is possible to reconstruct
discussion on whether human activity is should, if anything, have cooled down
temperatures over the last few hundred
involved in climate change is still con- over the last 40 years. All of this points to
thousand years with relatively high pre-
tinuing. So the question to you, as an the fact that it really is human activities
cision from ice cores. Other methods can
expert, is: Are human activities changing that have caused this warming.
be used to reconstruct temperatures from
the climate, or is it merely a natural
phenomenon? deep-sea sediments; these results are
WIND BLATT If this is all so obvious,
very consistent with those from ice cores.
why is there so much scepticism as to
Rahmstorf: To begin with, it is certain Other parameters can also be deter-
whether human activities are to blame for
that over the last hundred years the Earth the changing climate? mined, such as the atmosphere’s dust
has warmed up significantly – by 0.6 to content or even different gases, such as
0.8 degrees. In comparison with the pre- Rahmstorf: There are of course pow- CO2, from the air bubbles in the ice. In-
vious 1,000 years, that is an exceptional erful interest groups who do not want to formation can even be obtained from
climatic development, no longer within hear this, and who are looking for other the sediments about sea currents in the
the range of normal variations. Secondly, possible explanations. In must also be past.
it is clear that the carbon dioxide content said that practically every recognised
of the atmosphere has risen by one-third scientific theory has a small percentage WIND BLATT What can researchers
as a result of human emissions; this of people who vehemently reject it – learn from the past that is relevant to the
must, for straightforward reasons of whether it is the theory of relativity, the present change in climate?
6/2002 WIND BLATT 15
Rahmstorf: We can learn how power- about before. But I think that is very un-
ful the individual factors are in each of the
different climate changes, such as the
likely. Info Service
sun’s cycles, irregularities in the Earth’s WIND BLATT Is it still possible to stop
orbit or the CO2 content of the atmos- climate change? And what role do re- 04/12/ Award of the European
phere. There have also been variations in newable energies have to play in this? 2002 Solar Prize 2002
Berlin Organiser, and information from:
CO2 content in the climate of the past –
during the ice ages it was significantly Rahmstorf: We can stop climate Tel. +49 (0)2 28 / 36 23 73
lower than in warmer periods. CO2 was change by sharply reducing the emission Fax +49 (0)2 28 / 36 12 - 13
not the cause of the ice ages, but simply of climate-changing gases. If we want to email@example.com
intensified them; nevertheless, we can stabilise the atmosphere’s CO2 content, www.eurosolar.org
learn from this how powerful the carbon we would have to reduce the worldwide
10/12/ Kyoto is Business –
dioxide effect is. Analysis of the climate of emission of CO2 by about 60 percent. We
2002 Mechanisms for
the past has important consequences for do not have to achieve this straight away, Brussels CO2 Reduction
our understanding of how strongly human but nevertheless within about 50 years. Organiser, and information from:
activities are modifying the climate. That is an achievable goal. And renewable e-mission 55
Altogether everything indicates that in the energies of course play an important role Tel. +49 (0)2 28 / 2 09 46 94
20th century the influence of human here, in addition to improvements in Fax +49 (0)2 28 / 2 09 47 09
activities has become dominant. firstname.lastname@example.org
energy efficiency and an altogether lower
consumption of primary energies.
WIND BLATT Would the requirements 2002 Wind Energy Converter
of the Kyoto agreement be sufficient if Göttingen Modules: Main Carrier,
they were observed by every country? Tower and Foundation
Organiser, and information from:
Bundesverband WindEnergie e.V.
Rahmstorf: Kyoto is just a first step.
(BWE) Service GmbH
The Kyoto agreement was only intended Tel. +49 (0) 30 / 2 84 82-1 09
as a start to climate protection, and not Fax +49 (0) 30 / 2 84 82-1 07
the solution to the problem. For this J.Liersch@wind-energie.de
reason the specifications of the Kyoto www.wind-energie.de
agreement initially only apply for the next
14-16/01/ 10th Handelsblatt Annual Energy
10 years. There are discussions as to how
2003 Industry Conference 2003
WIND BLATT Could an entirely new the reduction targets can be significantly
Berlin Organiser, and information from:
finding, calculation or discovery com- tightened after that. We are talking about EUROFORUM Deutschland GmbH
pletely overturn climate researchers’ a long-term problem that cannot be Tel. +49 (0)2 11 / 96 86-34 31
present theories about warming? solved within 10 years, but for which 50 Fax +49 (0)2 11 / 96 86-40 40
years will certainly be needed. email@example.com
Rahmstorf: Our understanding of the www.euroforum.com
climate system has been increasingly WIND BLATT Which regions will be 14/01/ Seminar
substantiated over the last 10 years – in most affected by climate change over the 2003 Climate Savers in the Spotlight
particular the excellent new data about next 50 years? Linz Organiser, and information from:
the climate of the past, and our improved OÖ. Akademie für Umwelt
understanding of former climate changes, Rahmstorf: It is not possible at the und Natur
have made a major contribution to this. firstname.lastname@example.org
moment to make reliable regional fore-
I cannot see any probability of a revo- casts as to how climate change will pro-
lutionary new understanding. In fact I ceed. But it can be said that poor regions 30-31/01/ The Farmer as Energy
only expect a gradual improvement in our will be affected most. That is not neces- 2003 and Raw Material Manager
state of knowledge. Theoretically, of sarily because climate change will be Vienna Organiser, and information from:
course, one cannot rule out the possibili- strongest in those regions, but because Energieagentur NRW,
ty that every climate researcher has been they are the most vulnerable and least
mistaken, and that suddenly something able to protect themselves against the
will turn up which nobody had thought consequences.
ENERCON International sales offices
Schwachhauser Heerstrasse 299
Children enjoy idyllic
28211 Bremen · Germany
Phone: +49 /421/ 24 99 20
Fax: +49 /421/ 24 99 60
2120 Wolkersdorf · Austria
Phone: +43 / 2245 / 8 28 28
Fax : +43 / 2245 / 8 28 38
An E-40 for the Otterndorf summer camp
c/o Energy Converter AB
21376 Malmö · Sweden
Phone: +46 /40 /14 35 80
Fax: +46 /40 / 22 2420 “We began with small
Axiom House, Station Road
things. Donations were
Stroud, Glos. GL5 3AP · Great Britain
Phone: +44 /1453 / 76 67 74 used to acquire deli-
Fax: +44 /1453 / 76 67 70
E-mail : email@example.com
very bicycles instead
ENERCON Spain S.A.
c/o València Parc Tecnològic
Av. Juan de la Cierva, 27
of cars, and the hot-
E-46980 Paterna Valencia · Spain
Phone: +34/ 961/ 3678-70 water supply was con-
Fax : +34/ 961/ 3678-75
c/o Gellweiler Lda.
verted”, recalls Joa-
Travessa do Alecrim, 3 - 2°
1200 Lisbon · Portugal
Phone: +351/ 21/ 3 42 00 21
chim Jensch from the
Fax : +351/ 21/3 42 00 26
E-mail: firstname.lastname@example.org Otterndorf Summer
Van Karnebeekstraat 125
8011 JE Zwolle · The Netherlands
Camp Support Associ-
Phone: +31/ 38 /4 22 82 82
Fax: +31/ 38 /4 22 80 10
ation. It then became
ENERCON Service Ltd. Sti. clear that “something
PK.: 23 Kiziltoprak · Istanbul · Turkey
Phone: +90 / 216 /4 14 92 02
Fax: +90 / 216 / 3 45 29 59
big” would follow. Be-
DENMARK cause of the ideal wind
Bredkaer Parkvej 62
8250 Egaa · Denmark
Phone: +45 / 87/43 03 88 conditions, with an
Fax: +45 / 87/43 03 44
E-mail: email@example.com average of 6.8 m/sec
ENERCON Service Italia S.r.l.
Via G. Della Casa 7 at a hub height of
82100 Benevento · Italy
Phone: +39 / 082 /42 52 57
Fax: +39 / 082 /4 33 68 83 50 m, wind energy
GREECE presented itself as
20, Pentelis Ave.
15235 Vrilissia an ecologically sound
Athens - Greece
Phone: +30 / 10 68 38 490
Fax: +30 / 10 68 38 489 way of generating
AUSTRALIA electricity. The opera-
ENERCON Powercorporation Pty. Ltd.
3406 Export Drive · Trade Development
Zone · Northern Territory ting group is com-
NT 0822 Darwin · Australia
Phone: +61/ 8 89 47 09 33
Fax: +61/ 8 89 47 09 25 posed of the Support
EGYPT Association, the Mu-
c/o Zaki International Trading
23 Kasr El-Nil StreetCairo 11111 · Egypt
Phone: +20 / 2 / 3 92 36 70 nicipal Association for
Fax: +20 /2 /4 17 00 23
Wind Power Inc.
Suite # 222 Lebel Manison and Youth Support,
696 Kettles Street, Pincher Creek
Alberta TOK 1 WO · Canada
Phone: +1/4 03 / 6 27 29 23 and the company
Fax: +1/4 03 / 6 27 32 39
ENERCON (India) Ltd.
Kolsite House, Plot Nr. 31 “We are now hoping
Shah Industrial Estate
Veera · Desai Rd., Andheri (West)
Mumbai 400 053 · India The children at the The summer camp, founded in that we might even be able to fi-
Phone: +91/ 22 / 6 36 48 48
Fax: +91/ 22 / 6 31 51 53 1963, is now demonstrating its nance a solar roof for the leisure
E-mail: firstname.lastname@example.org Otterndorf summer camp
value as an idyllic leisure and centre with the profits", reports
Industria e Comércio Lda.
Av. Fernando Stecca n° 100 near Cuxhaven live educational facility with an Joachim Jensch with pleasure.
Distrito Industrial CEP
18087450 Sorocaba · Sao Paulo · Brazil
Phone: +55 /15 / 2 28 37 37 ecological bonus, although only
Fax: +55 /15 / 2 28 38 87 surrounded by, and in
a few years ago it was facing With a forecast annual yield of
I m p r i n t harmony with, nature. closure. Otterndorf had become 1.23 million kilowatt hours, the
Publisher: ENERCON GmbH
too expensive for its owners, converter will generate more
Dreekamp 5, 26605 Aurich
Phone: +49/421/9 27-0
the city of Hanover. But just than four times as much power
Fax: +49/421/9 27-1 09
Windblatt is printed on 100 % recycled paper.
type E-40 (600 kW) as the closure was under con- as the summer camp itself con-
ENERCON GmbH Aurich
A ENERCON wind energy
converter will in future watch
sideration, a support associa-
tion was rapidly formed. This
sumes. The converter is fitted
with an illustrated chart and a
Printed by: over the sleep of about 8,000 did not just protect the summer display that informs the children
Steinbacher Druck GmbH,
Osnabrück, young guests every year who camp from closure, but also about the electrical energy that
Phone: +49/541/9 59 00-0
The WINDBLATT magazine appears take a holiday away from city advanced its ecological con- has been generated and about
every two months and is regularly
included in the newspaper “New En- life at the leisure facility. version. the current power output.
ergy” – magazine of the Federal As-
sociation for Wind Energy.
Phone: +49/541/35 06 00 or
Fax: +49/541/3 50 60 30