Chuck Lenzie Generating Station Fully Operational

Final Phase Completed Ahead of June 30 Deadline

Apr 17, 2006, 01:00 ET from Nevada Power Company

    LAS VEGAS, April 17 /PRNewswire/ -- Nevada Power Company, a subsidiary
 of Sierra Pacific Resources (NYSE:   SRP), announced today that the second
 and final phase of the Chuck Lenzie Generating Station is now complete and
 fully operational.
     "With this second unit of our Lenzie facility now commercial, an
 additional 580 megawatts of power is flowing to customers in southern
 Nevada," said Roberto Denis, senior vice president of energy supply.
 "Energy from this unit, combined with the first 580-megawatt block that was
 brought on line earlier this year, provides an immediate benefit to our
 southern Nevada customers."
     Denis pointed out that the new, more efficient Lenzie facility produces
 more power using less natural gas than older generating plants and also
 provides an internal source of power for Nevada Power, eliminating the need
 to purchase energy in the more volatile and expensive open market. This
 significantly reduces the cost of energy southern Nevada customers would
 otherwise have to pay.
     This second phase of the project was also completed ahead of the June
 30, 2006, deadline, in time to help meet southern Nevada's higher demand
 for power in the hot summer months.
     Lenzie consists of four natural gas-fired combustion turbines, four
 heat recovery steam generators and two steam turbines operating in
 combined-cycle mode. The plant is located approximately 20 miles northeast
 of Las Vegas. It is the first company-owned power plant completed since
     Nevada Power Company is a regulated public utility engaged in the
 distribution, transmission, generation, purchase and sale of electric
 energy in the southern Nevada communities of Las Vegas, North Las Vegas,
 Henderson, Searchlight, Laughlin and their adjoining areas. The Company
 also provides electricity to Nellis Air Force Base, the Department of
 Energy at Mercury and Jackass Flats at the Nevada Test Site. Nevada Power
 Company provides electricity to approximately 750,000 residential and
 business customers in a 4,500 square mile service area.
     Headquartered in Nevada, Sierra Pacific Resources is a holding company
 whose principal subsidiaries are Nevada Power Company, the electric utility
 for most of southern Nevada, and Sierra Pacific Power Company, the electric
 utility for most of northern Nevada and the Lake Tahoe area of California.
 Sierra Pacific Power Company also distributes natural gas in the
 Reno-Sparks area of northern Nevada. Other subsidiaries include the
 Tuscarora Gas Pipeline Company, which owns 50 percent interest in an
 interstate natural gas transmission partnership and several unregulated
 energy services companies.

SOURCE Nevada Power Company