Home » Energy » Missouri and The Grid

Missouri and The Grid


This is the 4th in a series of posts on the national electrical grid. It focuses on Missouri’s position on The Grid.

MO NERC Regions MapNorth American Electric Reliability Corporation regions (NERC regions) don’t follow state boundaries. Precise information is changing and hard to find. For operating purposes, far western Missouri falls into the Southwest Power Pool Regional Entity (SPP). The rest of Missouri falls into the SERC Electric Reliability Corporation, which includes most of the southeastern United States.

For NERC reporting purposes, however, Missouri is divided among 3 reporting regions (See map at right.) Western Missouri continues to fall into the SPP Region. Central Missouri, running from Arkansas to Iowa, falls into SERC-N, a subregion of SERC. Eastern Missouri falls into the Midwest Independent Service Organization. This isn’t one of the NERC regional reliability corporations at all, it is a Regional Transmission Organization. We discussed RTOs at the end of the first post in this series. (The Grid) I don’t really know the rationale for this arrangement.

(Click on map for larger view.)

Missouri is a net energy exporter. In 2012, a total of 91.8 million megawatt hours of electricity were generated in Missouri, while 88.4 million megawatt hours were consumed. The remainder, 3.3 million megawatt hours, were exported out of state.

Missouri’s largest generating plants are shown in the following table:

Missouri’s 10 Largest Electricity Generating Plants:

Name Owner Generating Capacity (megawatts)
1. Labadie Ameren Missouri 2,412
2. Iatan Kansas City Power & Light 1,586
3. Rush Island Ameren Missouri 1,212
4. New Madrid Associated Electrical Coop 1,199
5. Callaway Ameren Missouri 1,190
6. Thomas Hill Associated Electrical Coop 1,145
7. Sioux Ameren Missouri 966
8. Hawthorn Kansas City Power & Light 950
9. Meramec Ameren 966
10. Dogwood Dogwood Power Management 616

Missouri-Electric-GridAs noted in my post The Grid, the ultra-high voltage transmission system running to St. Louis and Kansas City is relatively dense. Within the state, however, it is relatively thin, as shown in the map at right (the gray lines). The map also shows Missouri’s power plants by type. I’ve noted the ten largest with numbers on the map. There are actually a fair number of natural gas generating stations, shown in blue with the white center. However, all of the largest, except for the Callaway plant (nuclear) and the Dogwood plant (natural gas), are coal.

(Click on map for larger view.)

The largest electricity retailers (by sales) selling all this power to customers are as follows (name; sales; NERC reporting region; service territory):

  1. Ameren Missouri: $36,745,908; MISO and SERC-N; serves eastern Missouri with gaps to Columbia and beyond.
  2. Kansas City Power & Light; $16,661,029; SPP; with gaps, serves western Missouri from Chariton County to the state line, from the Iowa state line on the north, to Dade county on the south.
  3. Empire District Electric: $4,023,550; SPP; serves southwest Missouri from the corner of the state to St. Clair, Hickory, and Dallas Counties.
  4. City Utilities of Springfield; $3,036,734; SPP serves the City of Springfield and some surrounding areas, all within Greene County.

The low voltage distribution networks of the public utilities and electrical cooperatives throughout the state are, of course, extensive. These posts focus on the bulk power system, however, and won’t go into them.


“Table 10. Summply and Disposition of Electricity, 1990 through 2012, Missouri.” Missouri Electricity Profile. Energy Information Administration. http://www.eia.gov/electricity/state/missouri.

“Table 2. Ten Largest Plants by Generation Capacity, 2012, Missouri.” Missouri Energy Profile. Energy Information Administration. http://www.eia.gov/electricity/state/missouri.

“Table 3: Top Five Retailers of Electricity, with End Use Sectors, 2012, Missouri.” Missouri Electricity Profile. Energy Information Administration. http://www.eia.gov/electricity/state/missouri.

Regional Reliability Corporation membership lists on the websites of the various regional corporations.

Service territory maps on the websites of the respective electric utilities.


  1. Mark says:

    Can you comment on the interconnect grid map link attached above? What is the grey shaded region in MO, AR, OK and IA? Does that mean that area is serviced by multiple regional reliability councils (RRC)? Or is that an area in a state of change from one RRC to another, as you mentioned at the beginning of this post?

    • mogreenstats says:

      Thanks for your quetion, Mark. I don’t know for sure. But if you will surf to this web address,


      you will find a list of maps published by NERC. The map you reference is the color map of the three large Interconnections. But below it is a map of the NERC Regional Entities. These two maps appear to be almost identical, except the map of interconnections shows the Western and Eastern Interconnections. It also has the grey area you mention. The map of the Regional Entities does not have any gray areas.

      My guess, and it is just a guess, is that the map with the gray areas is an older map, and the gray represents areas that had not yet met NERC standards, and were not allowed into the interconnections. The other map is more recent, and shows that they have now met NERC standards. But it is just a guess.

      • Mark says:

        Thank you for your quick response. I poked around a little more, and found this map: http://www.eia.gov/state/maps.cfm. It’s the interactive U.S. Energy mapping system, so I would expect that it would be the most up-to-date available. (It looks like you referenced it in your post already.) If you follow the link, then Layers/Legend > Remove All > then scroll down and select Administrative Boundaries > NERC Regions, the resulting map has everything shaded in EXCEPT the grey area on the previous map in question. That, to me, would lend significant credence to your hypothesis that the unshaded area is not on any interconnect yet.
        Thanks again,

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s