Rocky Mtn. Power reaches 1 million

SALT LAKE CITY — Rocky Mountain Power has surpassed the 1 million mark for customers, the company has announced.

The nearly century-old company is serving 345 communities across three states. On March 31, it had 795,085 customers in Utah, 134,640 customers in Wyoming and 70,736 customers in Idaho.

The company said it is adding about 30 customers during an average day.

The roots of RMP, based in Salt Lake, date back to 1881 when Salt Lake City became the fifth city in the world to have central station electricity. The company was incorporated in 1912 as Utah Power & Light Co., consolidating several smaller electric companies in Utah, Idaho and western Colorado. Initially, it served 39,700 customers in 130 cities and towns. In 1989, Utah Power merged with PacifiCorp, which served customers in Wyoming as Pacific Power. In 2006, PacifiCorp, based in Portland, Ore., was acquired by MidAmerican Energy Holdings Co. and began operating as Rocky Mountain Power in Utah, Wyoming and Idaho.