WBZ TV: "Price Break for Installing Solar Power at Home" April 28, 2008. ....She hired Nexamp, Inc. of North Andover. They are a certified installer in the Commonwealth Solar program. "In Jane's case, the Commonwealth Solar rebate program is covering 46% of her system," explained Will Thompson of Nexamp. "Typical rebates cover between 25%-50%, depending on the home value and the income level of the individual"...... Link to Video and Article.