National Grid Massachusetts Solar, Net Metering & Rates

What homeowners should know

• National Grid's Massachusetts solar bill materials show net-metering credits for eligible excess generation.
• The published net-metering credit framework includes applicable distribution, transmission, transition and Basic Service components, subject to the current tariff and customer configuration.
• An interconnection agreement is required before a new residential solar system can operate in parallel with the grid.
• Massachusetts also has program-specific structures such as SMART and market net metering, so a proposal should identify the exact billing and incentive pathway it assumes.

Important: Utility tariffs change. Confirm the current rate schedule, interconnection agreement and export-compensation rules for your exact account before signing a solar proposal.

Massachusetts electricity and solar context

The state electricity-rate figure is a statewide EIA benchmark, not the utility tariff on your bill. Utility plans can differ because of time-of-use periods, tiers, fixed charges, riders, supply choice and solar-export treatment.

Official National Grid Massachusetts solar sources

Home Solar Atlas summarizes homeowner-facing rules but treats the utility's current tariff and interconnection documents as the controlling source.

Before you compare installer quotes

• Use 12 months of actual electricity consumption rather than only your average bill.
• Ask the installer which utility rate plan and export-compensation schedule the savings model assumes.
• Separate self-consumed solar value from exported-energy value if the utility uses net billing.
• For time-of-use tariffs, compare when the home imports energy with when solar exports occur.
• Model battery economics separately instead of assuming every exported solar kWh has retail value.