WORCESTER – The city is taking a significant step toward decreasing the community’s carbon footprint by embarking on a municipal aggregation program intended to provide local electricity customers with at least double the amount of local renewable energy required by state law. City Manager Edward M. Augustus Jr. announced Tuesday that the city has entered into a 34-month contract with Direct Energy Sources LLC to buy electricity for the Worcester Community Choice Electricity Aggregation program, which is scheduled to launch in February. He said the goal of the program is to significantly increase the amount of renewable electricity in Worcester’s supply while charging electricity customers about the same as what they would pay for National Grid’s basic service. Municipal aggregation, which became law in Massachusetts in 1998, allows the city to buy electricity on behalf of a group of ratepayers within the city boundaries. The program allows cities and towns to choose the electricity supplier for their electricity customers rather than having the local electric utility — National Grid for Worcester — buy the electricity. “We developed this program wi...