2009 State of the Market Report
Load and Resources
Figure 9: Generation Capacity in MW by Coordination Region 2007 – 2009
MidAmerican and Muscatine 2009 2008 2007
Consistent with the distribution of the load in the Midwest, more than 70 percent of the generating resources are located in the East and Central regions. Because it is a frequently congested area, we show the WUMS area separately from the rest of the East region of the Midwest ISO.
The year-over-year increase shown in the figure is primarily due to the new member additions of MidAmerican, Muscatine, and the Municipal Electric Utility of the City of Cedar Falls, Iowa in September 2009, which added 6.5 GW of capacity in the West (of which 1.5 GW is wind capacity). In addition, the Midwest ISO added another 1.6 GW of new wind resources and 1.4 GW of other new resources, primarily fired by coal and natural gas.
In addition to the location of generation, the geographic distribution of fuel used by those generators is important because it determines marginal costs and ultimately the patterns of prices in the Midwest ISO region. Our next analysis shows the generating capacity by fuel type in the four primary regions of the Midwest ISO.