; Homework 3 - Wind Energy
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# Homework 3 - Wind Energy

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```									                         SYST 6820 – Assessing Sustainable Energy Technologies

Homework #3
Wind Energy

1. Go to the Energy Information Agency web page,
data in Colorado. Scroll to Table 4 and find the Total Electric Industry generating capability
for 2002. Assuming a 1.5% annual growth rate from 2002 until 2010, how much generating
capacity in MW will Colorado need in 2010?

2. Scroll to Table 5 and find the Total Electric Industry generation of electricity for 2002.
Assuming a 3.2% annual growth rate from 2002 until 2010, how much generation in MWh

how many wind turbines would be necessary to meet Colorado’s electricity demand in 2010?
Assume:
a. 1.5 MW Turbines
b. 33% Capacity Factor

4. What is the capital cost per capita in Colorado to build the number of turbines you calculated
in Question 3? Assume capital cost of \$1M per MW of wind turbine generating capacity and

5. Assume that Colorado decides to replace all its electricity generating capacity with the
number of wind turbines you found in Question 3. To solve the intermittency problem, you
suggest that we use hydrogen to store the wind energy. The round trip efficiency of wind
(electricity – hydrogen – electricity) is 25%. That means you’ll need four times the number
of turbines you found in Question 3. What will be the total cost of energy per kWh in 2010 if
Colorado decides to do this? Ignore any PTC and accelerated depreciation benefits. Assume:
a. 1.5 MW Turbines
b. 33% Capacity Factor
c. 25% round trip efficiency
d. \$1M capital cost per MW of wind turbine generating capacity
e. \$500M capital cost for the hydrogen conversion and fuel cell equipment
f. 20 year life span
g. 6% interest rate
h. 2¢/kWh operating costs

6. How does this cost compare with the current cost of new coal figured generation at
3.5¢/kWh? Write a brief (400 words or less) argument on why Colorado should or should not
shut down its coal power plants and replace them with wind farms?

Created by Keith Stockton, 2006

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