Worcester homeowners are National Grid customers, and the distinction from Eversource carries real financial weight. National Grid’s Basic Service supply rate — the generation component of your bill — is set once per year on January 1 and locked for the full 12 months. Eversource resets its equivalent rate twice per year (January and July), allowing mid-year corrections when wholesale power prices drop. In elevated-price years, National Grid customers pay more than Eversource customers for the same consumption — and each kilowatt-hour their solar system offsets is worth correspondingly more.
National Grid’s net metering credit rate runs approximately $0.39 per kilowatt-hour for residential Class I systems — the 1:1 full retail rate based on National Grid’s current tariff. An 8kW Worcester system producing 9,000 kWh annually generates approximately $3,510 in annual combined net metering and SMART income at current National Grid rates, roughly $300 per year more than a comparable Eversource system in Boston. Over 25 years, that difference compounds to approximately $7,500 in additional value, all else equal.
National Grid is also frequently cited for faster interconnection timelines than Eversource — an operational advantage that shortens the period between contract signing and system activation. Worcester’s installer market, serving the broader central Massachusetts region, is well-versed in National Grid interconnection requirements. National Grid’s annual true-up falls in March, at which point any remaining surplus credits are settled at the wholesale avoided-cost rate rather than the full retail credit rate.
Worcester homeowners access the same Massachusetts two-track solar income structure as Boston and Cambridge, but through National Grid rather than Eversource. The mechanics are identical: net metering credits at the full retail rate for electricity exported to the grid, rolling forward month-to-month with an annual true-up in March; and SMART 3.0 production payments at $0.03 per kilowatt-hour of total production for 20 years. Both streams run simultaneously from the day your system activates.
National Grid has separate SMART 3.0 capacity blocks from Eversource — each utility manages its own block allocation with potentially different remaining capacity and incentive rates at any given time. Your installer should confirm current block availability and rate through National Grid’s SMART program administrator before committing to an installation timeline. As with Eversource, income-qualified Worcester households receive the $0.06 per kilowatt-hour SMART rate — double the standard payment. Battery storage earns a SMART adder above the base rate, and National Grid’s ConnectedSolutions program pays approximately $225 per kilowatt of battery capacity dispatched during summer peak events.
Worcester’s combination of National Grid’s higher rate, lower per-watt installation costs ($2.85–$3.30 per watt versus $3.10–$3.50 in Cambridge), and the full Massachusetts incentive stack — $1,000 state income tax credit, 6.25% sales tax exemption, 20-year property tax exemption — produces some of the most compelling solar economics in the state. A typical 10kW Worcester system at $3.08 per watt costs approximately $30,800 before incentives, and generates substantial annual value through the combined net metering and SMART income streams.
Worcester’s per-watt installation costs of $2.85–$3.30 per watt are meaningfully lower than Boston and Cambridge ($3.10–$3.50 per watt), reflecting the city’s more competitive installer market and less complex permitting environment. A typical 10kW Worcester system costs $28,500–$33,000 before incentives — $2,000–$5,000 less than a comparable Boston installation. After the Massachusetts $1,000 state income tax credit and the 6.25% sales tax exemption (approximately $1,780–$2,060 in savings on equipment), the effective out-of-pocket cost for a cash purchase runs $25,700–$30,000. National Grid’s higher rate amplifies annual savings relative to Eversource territory, making Worcester’s lower upfront cost and higher annual savings a strong combination. Payback periods of 7–8.5 years are typical for Worcester cash purchases at current National Grid rates, with 25-year savings projections that rival or exceed Boston despite the lower starting electricity rate.
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