The company operates through two groups, Whole Sale Energy and Retail Services.
The Whole Sale Energy group’s activities include production and sale of electric capacity and energy in the Rocky Mountain and western regions of the United States; production of natural gas and crude oil in the Rocky Mountain region of the United States; mining and production of coal; and marketing and transportion of fuel products in the western and mid-continent regions of the United States, and in western Canada.
The Retail Services group consists of electric, communications, and combination electric and gas utilities.
Its electric utility generates, transmits, and distributes electricity to approximately 62,000 customers in South Dakota, Wyoming, and Montana; and the sells electric energy and capacity on a wholesale or off-system basis.
The group’s communications utility provides broadband telecommunications services, including local and long distance telephone service, expanded cable television service, cable modem Internet access, and high speed data and video services to residential and business customers in South Dakota.
Its combination electric and gas utility provides electricity to approximately 38,000 customers; and natural gas to 31,000 customers in Cheyenne, Wyoming, and vicinity.
As of December 31, 2004, the company had 173,417 million cubic feet of total proved oil and natural gas reserves; and 294 millions of tons of coal reserves.
It also operated approximately 516 oil and gas wells.
Black Hills was incorporated in 1941 and is based in Rapid City, South Dakota.

