American Municipal Power Inc. has replaced its longtime leader. Jolene Thompson has been named president and CEO of the 170-employee company, which supplies power and services to 135 municipal electric systems and 650,000 customers in Ohio and eight other states. She replaces Marc Gerken, who announced his retirement last April after 20 years at the helm last year. She will come into the role April 1, with Gerken remaining as a consultant during the transition. “Jolene’s ongoing commitment…