July 2009 – November 2009
Capacity factor (efficiency) given as a percentage of the nameplate power output.
The table shows the capacity factor for the Ontario wind farms for the final 6 months of 2009. The capacity factor is the actual power output divided by the nameplate power; it is given as a percentage. The nameplate for each wind farm is given in the second row. As an example, consider the July-09 entry for Amaranth: The average hourly output for that month was 28 MW. Dividing by the nameplate power of 200 MW, we get 14%. The row labeled Average is the 6-month average. The row labeled Annual Average is the average for the calendar year 2009 for the wind farms that were operating for the full year. Note again that the Amaranth plant was having difficulties. In the final column, the numbers in brackets represent the monthly averages without the Amaranth data.
The bottom line is that the Ontario wind energy system is producing an average power output of 290 MW, about one third of one coal plant. This is enough to power the needs of 210,000 homes. This output is less than 1% of the electrical energy capacity available to Ontario (31.5 GW on December 30th, 2009) and about 1.5% of the typical demand (19 GW on December 30th, 2009, including 2 GW for export).
John Harrison – Jan. 2010