Nevada Power Company

In 2005, it had over 700,000 electric customers in parts of three Nevada counties — a service area of more than 4,000 square miles (10,000 km2).

In 1999, the company merged with Sierra Pacific Resources of Reno, the main electric and natural gas provider for northern Nevada.

The merged company retained the Sierra Pacific name, but moved its headquarters to Las Vegas.

In 2003 the company installed two of the largest phase shifting transformers in the world at its Crystal switching station to deal with the large quantity of imported power.

Plans were announced on June 21, 2005 to purchase from Pinnacle West Capital Corporation its 75% interest in a 570 megawatt plant.

This practice continued until the 1950s when the company again started running power plants to provide a portion of its base supply.

As a result, the company's main transmission lines both serve its customers and provide inter-company power transport services.