Residents have a chance to offer comments on the proposal for a new gas-fired plant on the site of the Salem Harbor Power Station when the state Energy Facilities Siting Board holds a public hearing on the plan Wednesday at 7 p.m. at Salem High School. Footprint Power LLC announced last month that it had finalized its purchase of the power station from Virginia-based Dominion Energy. The plant’s two coal-fired units were removed from service last Dec. 31, and the two remaining units — one coal-fired and one oil-fired — are scheduled to shut down on June 1, 2014. Footprint has contracted with a Washington company to operate the existing plant until the closing, when it will demolish the facility and conduct a cleanup. The proposed gas-fired facility would be housed in a 115,000-square-foot building. Natural gas would be delivered to the site via a new 16-inch pipeline owned and operated by Spectra Energy, which would construct an on-site metering and control station. In addition to comments at Wednesday’s meeting, the public can provide written comments to the board until Oct. 3. For more information, go to www.mass.gov/eea/energy-utilities-clean-tech/energy-facilities-siting-board.