In order to meet the growing needs of our customers, Heartland maintains a diverse power supply portfolio. Our baseload resources include coal-fired generation from Whelan Energy Center Unit 2 near Hastings, Nebraska, and Laramie River Station near Wheatland, Wyoming. Renewable energy generated at Wessington Springs Wind Energy Center near Wessington Springs, South Dakota, accounts for 16% of Heartland's power supply, surpassing South Dakota's voluntary renewable energy standard of 10% by 2014. Other resources include nuclear power generated at Cooper Nuclear Station near Brownville, Nebraska, and peaking sources located in our customer communities.

Our power is delivered over the Integrated System (IS), a high-voltage transmission system that covers a seven-state area and consists of over 9,300 miles of line. Heartland jointly owns the IS with Western Area Power Administration and Basin Electric Power Cooperative. For information on the IS, the IS tariff, business practices and interconnection requirements, visit the IS OASIS site.