BOISE, Idaho (AP) — Idaho Power Co. Chief Executive Officer LaMont Keen is retiring at year's end, to be replaced by the company's chief financial officer. Darrel Anderson will step in for Keen Dec. 31.

The state's largest utility made the announcement on Thursday. Keen has been employed at Idaho Power for nearly four decades and led the company since 2006. He'll remain on the company's board of directors after he leaves.

Anderson began working for Idaho Power in 1996, serving as vice president, chief financial officer and treasurer, vice president of finance and as a controller. He has a degree from Oregon State University in accounting and finance. Idaho Power serves 504,040 customers in a service area that includes southern Idaho and eastern Oregon. It gets electricity from dams, coal, gas and solar.