About 20 residents, including some from other towns like Mystic and Ashford, spoke out against the project, said Jason Anderson, the town council president. The Killingly Energy Center has already received the approvals it needs from the town’s planning, zoning, and inland wetland commissions. The state Siting Council denied the project once but last June it finally gave the nod to a revised version of the project. Now that decision has been appealed to the Connecticut Superior Court by a local citizens opposition group, Not Another Power Plant. Most local concerns are about the environmental impact, Anderson said. A major concern is the pollution from the power plant’s smokestack and how that could be affected by its height.