Fast Facts

An Overview of the SPP System

SPP has members in 14 states: Arkansas, Iowa, Kansas, Louisiana, Minnesota, Missouri, Montana, Nebraska, New Mexico, North Dakota, Oklahoma, South Dakota, Texas and Wyoming.

SPP also provides contract reliability coordination services in Arizona, Colorado and Utah.

  • Service territory: 552,885 square miles (approx.) (2021)
  • Substations: 5,087 (2021)
  • Generation plants: 842 (in Eastern Interconnection reliability coordination footprint)
  • Miles of transmission: 70,025 (2021)
  • Coincident peak load: 51,037 MW (July 28, 2021)
  • Winter peak load: 43,661 MW (Feb. 15, 2021)
  • Generating capacity: 94,648 MW (based on nameplate capacity as of Jan. 13, 2021)
    • 38.9% natural gas
    • 29.0% wind
    • 24.3% coal
    • 3.6% hydro
    • 2.2% nuclear
    • 1.7% fuel oil
    • 0.2% solar
    • 0.1% other
  • Energy production by fuel type
    • 38.6% coal
    • 29.5% wind
    • 22.7% natural gas
    • 6.8% nuclear
    • 2.3% hydro
    • 0.1% solar
    • 0.3% other

Primary Services Provided to Members and Customers

SPP provides many services to its members and customers. These services include:

  • Reliability Coordination:  SPP monitors power flow throughout our footprint and coordinates regional response in emergency situations or blackouts.
  • Tariff Administration:  SPP provides "one-stop shopping" for use of the region's transmission lines and independently administers an Open Access Transmission Tariff with consistent rates and terms. SPP processed an average of 7,551 member transmission service requests per month in 2019. 2019 transmission service transactions totaled $4.21 billion.
  • Regional Scheduling:  SPP ensures the amount of power sent is matched with power received.
  • Transmission Expansion:  SPP's planning processes seek to identify system limitations, develop transmission upgrade plans, and track project progress to ensure timely completion of system reinforcements.
  • Market Operations:  The Integrated Marketplace launched in 2014, replacing the Energy Imbalance Service (EIS) market. It includes a day-ahead market with transmission congestion rights, a reliability unit commitment process, a real-time balancing market replacing the EIS market, and the incorporation of price-based operating reserve procurement. SPP's own analysis showed its markets provide participants with net savings of $570 million annually.
  • Training:  SPP offers continuing education for operations personnel at SPP and throughout the region. SPP's 2019 training program delivered over 35,578 training hours to 207 organizations, representing reliability, train-the-trainer, Integrated Marketplace and transmission settlement courses.