Massachusetts municipalities have utilized Qualified Energy Conservation Bonds (QECBs) to finance energy projects at significantly lower interest rates due to federal subsidies. Case studies from the towns of Belchertown and Gill illustrate successful energy efficiency upgrades, with Belchertown achieving a 20% reduction in energy consumption and Gill realizing substantial cost savings from energy management improvements. The document outlines application processes for upcoming QECB solicitations, emphasizing the financial benefits for local governments in pursuing cleaner energy initiatives.