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Get a Free QuoteFull Retail Rate credits at $0.3200/kWh · Massachusetts · Residential cap 25kW
$0.32/kWh
Credit Rate
25 kW
Residential Cap
$7.00
Min Monthly Bill
monthly
Credit Rollover
Last updated: 2025-02-01
National Grid (MA) customers earn $0.3200/kWh per kWh through full retail rate net metering credits — dollar-for-dollar against your retail rate. Credits roll over monthly with march annual true-up. The typical National Grid customer with a 8kW system saves $2,602.56 per year.
Net metering lets you earn credits for surplus solar energy sent back to the grid. Here is how it works with National Grid.
Solar panels are installed on your roof or property and wired to an inverter.
Your system is interconnected with the utility grid through a bidirectional meter.
Panels produce electricity throughout the day, powering your home first.
A smart meter measures electricity flowing both to and from the grid in real time.
Excess energy sent to the grid earns credits that offset your future electric bills.
All current residential rate schedules relevant to net-metered solar customers. Understanding your rate schedule is critical for accurately estimating savings.
| Plan Name | Rate | Fixed Charge | TOU Available | Peak Rate | Off-Peak Rate |
|---|---|---|---|---|---|
| R-1 Residential | $0.3200/kWh | $7.00/mo | No | — | — |
| R-4 TOU Residential | $0.3200/kWh | $7.00/mo | Yes | $0.3155/kWh | $0.2104/kWh |
Peak hours: Mon-Fri 12pm-8pm
Based on a typical National Grid household using 900 kWh/month with a 8kW system generating 800 kWh/month.
Estimated Annual Savings
$2,602.56
$216.88/month average
Your credits depend on system size, utility, and local rates.
Calculate My SavingsResidential Cap
25 kW AC
Commercial Cap
2 MW AC
Interconnection Fee
Free ($0)
Application Timeline
2-4 weeks
Permit Required
Yes, local building permit required
Inspection
Utility inspection required before PTO
Meter Type
Bidirectional smart meter
Minimum Monthly Bill
$7.00
Residential net metering cap expanded from 10kW to 25kW AC (February 2025)
New online interconnection portal launched for faster application processing
Smart meter deployment ongoing throughout western MA service territory
Updated rate structure effective January 2026 with slight supply cost increase
Some third-party sources may still display outdated net metering data for National Grid. The information on this page is sourced directly from utility filings and verified as of 2025-02-01.
What National Grid customers need to know about net metering in 2026.
National Grid MA credits solar exports at 100% of the retail rate ($0.32/kWh in 2026), providing full dollar-for-dollar bill offsets.
The residential system cap was expanded to 25kW AC in February 2025, matching the statewide update across all MA investor-owned utilities.
Annual true-up occurs in March, when any unused excess credits are zeroed out with no cash payment.
No interconnection fee is required for residential solar installations.
National Grid serves western Massachusetts and parts of the south coast, covering approximately 1.3 million electric customers.
The minimum monthly customer charge is $7.00, which cannot be offset by net metering credits.
SMART program incentives stack with net metering, providing additional per-kWh income on top of bill credits.
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Common questions about National Grid net metering.
Primary Source
National Grid R-1 / R-4 Tariff ScheduleLast Verified
2025-02-01
Methodology
Rate data and policy details are sourced directly from National Grid's published tariff schedules and interconnection standards. We verify this data monthly against utility filings and update the page within 48 hours of any confirmed policy change.
See how much you can save with National Grid net metering credits at $0.3200/kWh. Our Massachusetts solar experts will design a system optimized for your utility rate plan.