Massachusetts Net Metering Explained: What Homeowners Need to Know
If you're thinking about going solar in Massachusetts, you've probably heard the term "net metering." It sounds technical, but the basic idea is simple: when your solar panels make more electricity than your home uses, that extra power flows back to the grid — and your utility company gives you credit for it. Those credits lower your future electric bills.
Massachusetts has one of the stronger net metering programs in the country, which is a big reason why solar makes financial sense for so many Bay State homeowners. Here's how it all works in plain English.
How Net Metering Works in Massachusetts
Your solar system is connected to the electric grid through a two-way meter. On a sunny afternoon when your panels are running at full power, you might produce more electricity than your home needs at that moment. Instead of wasting that energy, it travels to the grid.
Your utility company measures how much you sent out and gives you a kilowatt-hour (kWh) credit on your bill. Later — at night, on cloudy days, or in winter — when your panels can't cover all your needs, you pull power back from the grid and use those credits to offset the cost.
At the end of each billing cycle, you only pay for your "net" usage: the difference between what you drew from the grid and what you sent to it. If you sent more than you used, the excess credits roll over to your next bill.
Who Qualifies for Net Metering in Massachusetts?
Most residential solar customers in Massachusetts qualify. The program is governed under Massachusetts General Laws Chapter 164, Section 138–140, and the Department of Public Utilities (DPU) oversees how utilities implement it.
Key eligibility points:
- Your solar system must be located in Massachusetts.
- The system must be 60 kilowatts (kW) or smaller to qualify as a "Class I" net metering facility under the residential rules (larger systems use a different track).
- Most standard residential installations fall well under this cap — a typical home system runs 6–12 kW.
- You must be a customer of one of the state's regulated utilities (Eversource, National Grid, or Unitil).
If you use a municipal electric company (like TAUNTON Municipal Lighting Plant), net metering terms may differ because munis set their own policies.
What Credit Rate Do You Receive?
This is where Massachusetts net metering gets a little more detailed. The credit rate you receive depends on whether you are a Class I (small residential) net metering customer.
For residential customers, the credit is typically applied at the full retail electricity rate — meaning you're credited at the same rate you would pay to buy that electricity. That's a better deal than some states, which only credit you at the lower wholesale rate.
However, Massachusetts utilities also charge certain fixed fees that net metering credits cannot offset (like distribution or minimum monthly charges). So even with robust solar production, expect a small monthly bill in most cases.
Credit rates are set by your utility's approved tariff and can change over time. Ask your solar installer or utility for the current rate before you sign any contract.
How Credits Roll Over
Unused net metering credits do not expire immediately. In Massachusetts, excess credits roll over month to month throughout the year. This matters a lot because your panels will overproduce in summer and underproduce in winter.
At the end of each 12-month period (the anniversary of your system's activation), any remaining unused credits are typically reconciled. Some utilities pay out residual credits at a lower rate, while others let them continue rolling. Confirm the exact rollover policy with your utility when you apply for interconnection.
How to Get Started: The Interconnection Process
You don't sign up for net metering separately — it happens as part of the process of connecting your solar system to the grid. Here's a simplified overview:
- Hire a licensed solar installer. They design the system and pull permits.
- Submit an interconnection application to your utility. Your installer usually handles this.
- Receive utility approval and schedule a utility inspection.
- Your utility installs a bi-directional meter that tracks both what you use and what you send back.
- Flip the switch — you're now a net metering customer.
The timeline from application to activation can range from a few weeks to a few months depending on your utility and local permitting. Talk to a solar specialist now to get a realistic timeline estimate for your area.
Other Massachusetts Incentives That Stack With Net Metering
Net metering is just one piece of the financial puzzle. Massachusetts homeowners can often combine it with:
- Federal Investment Tax Credit (ITC): A 30% federal tax credit on the total cost of your solar system (verify current rates with a tax advisor).
- Massachusetts Solar Tax Credit: A state income tax credit of up to $1,000 for qualifying residential systems.
- SMART Program (Solar Massachusetts Renewable Target): A separate incentive that pays you a fixed rate for each kWh your system produces, on top of net metering credits. Enrollment is capacity-based and subject to availability.
- Property Tax Exemption: Solar installations are exempt from Massachusetts property tax increases for 20 years.
Combining these programs can significantly shorten your payback period. Visit our solar buyers page to compare vetted local installers who can model your specific savings.
Frequently Asked Questions
Does net metering eliminate my electric bill entirely?
It can dramatically reduce your bill, but most homeowners still pay small fixed charges each month. Whether you reach near-zero depends on your system size, your home's energy use, and your utility's fee structure.
What happens to my net metering credits if I move?
Net metering credits are tied to the account at your address, not to you personally. If you sell your home, the new owners typically inherit the system and any existing credits. Discuss this with your installer and utility before listing your home.
Can I be denied net metering in Massachusetts?
Your utility can occasionally put interconnection on hold if there are grid capacity constraints in your area, but outright denial for standard residential systems is rare. Utilities are generally required to accommodate qualified applicants under state law.
Is the SMART Program the same as net metering?
No. They are separate programs that can work together. Net metering credits offset what you owe your utility for grid electricity. The SMART Program pays you a separate production incentive for every kWh your panels generate, regardless of whether you use it or export it.
How long does net metering last?
Your net metering agreement stays in place as long as you remain a utility customer with an active solar system. State policy can change over time, but systems already enrolled are generally grandfathered under the rules in effect when they connected.
Understanding Massachusetts net metering is the first step toward making a confident solar decision. Every home — and every electric bill — is different, so the real savings you'd see depend on your specific situation.
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