ONTARIO ZONE MARKET QUANTITIES ONTARIO ZONE MARKET PRICES DAILY

							        Tuesday February 1, 2005 2010
             Thursday March 11,


                                                ONTARIO ZONE MARKET QUANTITIES
                                                                                                         1
                                                       DAILY                               ON PEAK                                OFF PEAK
                   (MW)
                                               Ave         Max           Min          Ave          Max           Min         Ave          Max           Min
                Market Demand              17,168       20,163       14,663       18,107       20,163        16,849       15,290       17,020       14,663
               Ontario Demand              15,881       17,929       13,184       16,888       17,929        15,618       13,868       15,373       13,184
                            Imports            750        1,800              0        949        1,800           412          353          927              0
                            Exports         1,287         2,234          394        1,220        2,234           394       1,421        1,807           973
         Unavailable Capacity               8,137         8,756        7,554        8,137        8,756        7,554        8,139        8,191         8,055

                                                     ONTARIO ZONE MARKET PRICES2

            Energy Prices                              DAILY                                 ON PEAK                                OFF PEAK
              ($/MWh)                          Ave         Max           Min          Ave          Max           Min         Ave          Max             Min
                              HOEP          25.93         39.07         9.30        26.95        32.27        16.96        23.89        39.07            9.30
               5 Minute MCP                 25.93         59.45        -0.01        26.95        59.45          6.13       23.89        50.50           -0.01
         Operating Reserve
         Prices ($/MWh/hr)
              10 Minute Sync                  2.39        10.08          0.20         3.49       10.08          0.20         0.20         0.20           0.20
          10 Minute Non-Sync                  2.39        10.08          0.20         3.49       10.08          0.20         0.20         0.20           0.20
                         30 Minute            2.39        10.08         0.20          3.49       10.08          0.20         0.20         0.20           0.20

                                                             DAILY SUMMARY DATA
        Weighted         Total Market           Value of                         DA/RT IOG Operating Emergency Emergency
                                                                      CMSC
         HOEP              Demand                Market                          Summary    Reserve    Purchases  Sales
                                                                    Estimate ($)
        ($/MWh)             (MWh)              Demand ($)                           ($)   Estimate ($)   (MWh)   (MWh)
               26.10            412,032            10,754,035             273,490            18,701             87,344                  0.0               0.0




1
 OnPeak hours are defined as hours 8 to 23 Monday to Friday (excluding holidays)
2
  Prices are not considered final until two business days after the trade date.
3
 Operating Reserve can vary from normal levels for two reasons. Firstly, when O/R is activated to recover from system contingencies, the requirement is reduced until
reserve can be re-prepared. Secondly, unexpected events can cause market sources of Operating Reserve to be insufficient to meet the needs. Generator breakdowns,
heavier than expected demand for electricity, or failed intertie imports, can cause the IESO to use Out-of-Market sources to meet Northeast Power Coordinating Council-
based O/R requirements. Out-of-Market O/R sources can include relying on a plan to reduce demand by reducing the delivery voltage, converting firm export
transactions to interruptible transactions, or reducing required reserve for a limited time, as permitted under NPCC policies.