Cambridge Solar Costs: The Smart Investment

The Cost of Solar in One of America’s Smartest Cities

Cambridge homeowners are no strangers to high costs — the median home value is well over $900,000, and Eversource electricity rates hover around 31 cents per kWh. But Cantabrigians also know a good investment when they see one. Solar panels in Cambridge cost about $3.30 per watt before incentives, slightly above the state average due to the complexities of installing on older homes and navigating the Cambridge Historical Commission’s guidelines in certain neighborhoods.

Despite the higher upfront cost, Cambridge’s premium Eversource rates and high property values make the solar ROI exceptionally strong. Homeowners in neighborhoods like North Cambridge, West Cambridge, and Cambridgeport are going solar at increasing rates — the city’s Net Zero Action Plan has set aggressive climate targets, and residential solar is a key piece of the strategy. With the right system, Cambridge homeowners can cut their Eversource bill by 80–100% while adding significant equity to already-valuable properties.

Solar System Costs by Size

Cambridge Incentives: How the Numbers Add Up

Cambridge homeowners access the full suite of Massachusetts solar incentives plus some unique local advantages. The 30% federal tax credit saves about $6,930 on a 7 kW system. MREC payments add roughly $300 per year for 25 years. The 6.25% sales tax exemption saves $1,440 on a typical installation. And the property tax exemption is particularly valuable in Cambridge, where the residential tax rate is $5.86 per $1,000 — a solar system that adds $20,000 in home value would otherwise cost an extra $117 per year in property taxes.

Cambridge also benefits from the city’s strong commitment to renewable energy. The Cambridge Community Electricity program offers competitive supply rates and green energy options, and the city’s sustainability office actively promotes residential solar adoption. These local programs complement the state incentives to make the financial case for solar even stronger.

Eversource Rates in Cambridge: The Escalating Cost of Doing Nothing

Eversource’s residential rate in Cambridge averages about 31 cents per kWh for total delivered electricity. Supply rates have been volatile — swinging between 12 and 25 cents per kWh for supply alone over the past two years — making it nearly impossible to budget your electricity costs without solar. A typical Cambridge home using 7,000 kWh per year pays Eversource roughly $2,170 annually, and that number has grown by more than 50% over the past five years.

Solar eliminates that volatility. A fixed-rate lease or PPA locks in your energy cost for 20–25 years. As Eversource rates continue their upward march — driven by infrastructure investments, grid modernization costs, and increasing demand — your solar payment stays the same. In a city where cost predictability matters, solar delivers peace of mind alongside real savings.

25-Year ROI for a Cambridge Home

Take a typical two-family in North Cambridge or a single-family in West Cambridge using 7,500 kWh per year. At Eversource’s rate of 31 cents per kWh, that is $2,325 annually. A $0-down solar lease at $135 per month — $1,620 per year — saves you $705 in year one. Factor in 3% annual rate increases from Eversource, and those savings compound quickly.

Over 25 years, cumulative lease savings surpass $38,000. Purchase the system at a net cost of $14,070 and the payback period is about 7 years, after which you generate free electricity for 18+ years — total savings of $50,000 to $60,000. In Cambridge, where home values are already high, the $15,000–$20,000 property value increase from solar is a meaningful addition. Combined with MREC income, a Cambridge solar installation is one of the most reliable long-term investments a homeowner can make.