What is modeled — and what is not
Production
1,310 kWh/kW-year planning benchmark. PVWatts-based state planning benchmark.
Installed cost
$3.00/W planning benchmark for Worcester, MA.
Electricity value ceiling
30.49¢/kWh · EIA residential benchmark for Massachusetts (2026-07).
National Grid MA rate context
39.51¢/kWh · R-1 default service · Massachusetts Electric. This is utility rate-plan context, not a verified solar export-compensation rate.
Utility source: Current official utility/regulator rate source · verified 2026-09-28.
Production: NREL PVWatts methodology · Cost: 2026 state / local marketplace benchmark.
Solar export source: National Grid M.D.P.U. No. 1625 Net Metering Provision · National Grid Massachusetts solar incentives and programs · verified 2026-10-03.
Why exact National Grid Massachusetts solar savings still require customer-specific billing inputs
Exact National Grid Massachusetts export value requires facility classification and the applicable standard or market credit calculation. CalcuRiver shows the verified policy boundary instead of flattening it into a retail-rate assumption.
Continue this Massachusetts cost analysis
Why this solar estimate changes
Solar value is driven by local production, installed cost, the retail value of electricity you avoid buying, and the compensation you receive for exported energy. CalcuRiver does not assume export credits equal the retail rate unless that utility program is explicitly verified.
Core logic: self-used solar offsets retail purchases; exported solar is valued only under a verified export-compensation rule.
Methodology & source policy