Hawaiian Electric Industries is a holding company with its principal subsidiaries engaged in the electric utility, banking and other businesses operating primarily in the state of Hawaii. The company's electric subsidiary Hawaiian Electric Company, and its operating subsidiaries, Maui Electric Company and Hawaii Electric Light Company are regulated electric public utilities that provide electric public utility service on the islands of Oahu, Maui, Lanai, Molokai and Hawaii. HECO also owns nonregulated subsidiaries, Renewable Hawaii and HECO Capital Trust III. HEI also owns, directly or indirectly, subsidiaries HEI Diversified and its subsidiary, American Savings Bank and the subsidiaries of ASB, which include Pacific Energy Conservation Services, HEI Properties, The Old Oahu Tug Service and HEI Power Corporation and its subsidiaries. Hawaiian Electric Industries is headquartered in Honolulu.