Massachusetts Massachusetts is currently the number 6th state in the country for solar installation. Solar is powering over 260,000 homes in the the Bay state and it plans to install another 2,377 megawatts of solar over the next 5 years! Massachusetts has a bunch of great state incentives that can be added on top of the federal incentives to cover a large portion of your system cost. For example, Massachusetts has sales tax breaks, property tax breaks, renewable energy tax breaks, and so many more. These savings can add up to thousands of dollars off the cost of your solar system! Along with many other states, Massachusetts has a net-metering program that allows homeowners with solar to receive credits on their utility bills and keep the excess energy that they produce to use at a later date!