Mountain West Transmission Group

Several electric utilities along the Rocky Mountain Front Range are moving forward with their own grid reforms. So, what does this mean for California and the rest of the West?   

The effort, called the Mountain West Transmission Group (Mountain West) first began back in 2013. Since then, it has evaluated the potential benefits of joining one of the existing Regional Transmission Organizations (RTOs), and assessing the costs and benefits of membership: The California Independent System Operator (CAISO), the Mid-Continent Independent System Operator (MISO), PJM Interconnection (PJM), and the Southwest Power Pool (SPP) all submitted proposals to Mountain West to become part of their RTOs.  

Although no decisions have yet been made, Mountain West is focusing on in-depth discussions with the Southwest Power Pool (SPP), headquartered in Little Rock, Arkansas.

Why would the Mountain West utilities want to join a regional grid organization? For one thing, it will save money. Sharing power across a single, large grid region is a lot more efficient than each utility separately managing its electricity needs. Larger market regions are especially helpful for getting as much electricity as possible from the west’s abundant wind, solar and coal resources. 

The multi-colored map below shows the 38 different entities managing the way power flows around the Western Interconnect. This is a complex and inefficient process that needs to be modernized. 

Mountain West consists of these 10 public and private utilities:

  • Basin Electric Power Cooperative (BEPC), based in Bismarck, N.D.; 
  • Black Hills Energy’s three electric utilities in Colorado, South Dakota and Wyoming, subsidiaries of the Rapid City-based Black Hills Corp
  • Colorado Springs Utilities (CSU);
  • Platte River Power Authority (PRPA), based in Fort Collins, Colo.; 
  • Public Service Co. of Colorado (PSCo), an operating company of Xcel Energy based in Denver;
  • Tri-State Generation and Transmission Association (Tri-State), based in Westminster, Colo.; and
  • Western Area Power Administration’s (WAPA) Loveland Area Projects (LAP) and Colorado River Storage Project (CRSP).

Combined, the 10 utilities represent nearly 6.4 million customers, primarily in the U.S. Rocky Mountain Region, and have about 10,000 MW of load.

Above is a map of what the two new regional operators would look like in the West and how SPP and Mountain West could become one.  (NRDC, 1/18/2017)