The city is locking into a solar program that could bring it $200,000 in energy savings annually over the next 20 years for a total of about $5 million and essentially shift it to clean energy. The City Council on Tuesday night authorized Mayor Elinor C. Carbone to sign a nonresidential Renewable Energy Solutions Auction Program – State Agricultural and Municipal Solar Program Service agreement. Through the program, the city will be matched with a solar project for which it will become the “virtual off-taker,” attorney Paul Michaud said in a presentation. Michaud represents TRITECH Americas, which will develop the project to which the city will be paired, assuming the company is awarded an appropriate project through an Eversource Energy auction. The six-year program is a response to a state law requiring a zero-energy carbon grid by 2040, Michaud said.