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Net Metering

Watch this short 1-minute video that illustrates how electricity is purchased from and sold to the electric grid.

The energy you generate from your solar panels is used to power your home throughout the day. On sunny days, your system may produce more electricity than you need. When this happens, this excess energy is sent back to the Eversource electric grid.

At the end of each billing month, the total electricity you sent back (sold) to the grid will be subtracted from the total amount of energy you used (purchased) from the grid. This determines your "net" amount. 

Net metering is one way you can be compensated for this extra energy your system produces. The formula is simple:

Energy you produce - Energy you consume = net energy  

During the installation of your solar system, Eversource will replace your existing electric meter with a new model that reads the amount of electricity flowing in and out of your home. This meter helps us calculate your monthly net metering credit.

If you participate in the SMART program, your solar installation will include a second meter to measure your production to earn SMART incentives.

If your system is 10kW or less, the rate at which you earn net metering credits will be slightly lower than the full retail rate you pay for power from Eversource. This is because charges for energy efficiency, renewable energy and distributed solar are excluded from the net metering rate.

The net metering rate (as determined by state law) will change as our rates fluctuate. Systems larger than 10kW may receive a lower net metering rate.

Earned net metering credits can be used to reduce the amount owed on your monthly electric bill.

Your monthly bill will look different than it did before you installed a solar energy system. In months where you produced more energy than you used, your Eversource bill should show a negative balance because net metering credits were applied to that bill and possibly roll over to future bills.

If you use more electricity than you generate, Eversource supplies the power you need at the standard rate. If this occurs over the course of a month, net metering credits will not appear on your bill.  

View sample net metering bill for more details.

State laws cap the number and size of projects that can benefit from net metering. Residential solar installations smaller than 10kW will usually qualify for net metering. Systems larger than 10kW may receive credits at a reduced rate.

You solar contractor will apply for net metering for you when applying to interconnect a new solar system to the Eversource grid. You will be asked to complete a Schedule Z form and your installer can help you with this process. 

Talk to your solar installer or review the Massachusetts net metering guide and the Eversource solar contractor's net metering guide to see if your system is eligible for net metering.  

Earned credits roll over each month. If you find yourself accumulating too many credits, you can share them with other Eversource customers in Massachusetts. This is known as virtual net metering. 

You are limited by your home's location to where you can transfer credits. In western Massachusetts, you can share net metering credits only with other customers in western Massachusetts.

In eastern Massachusetts, other customers must be in your same load zone of either southeastern (SEMA) or northeastern Massachusetts (NEMA) to receive credits. View the ISO load zone map for more information.   

You can change your net metering credit allocations up to two times per calendar year by submitting a new Schedule Z form to Eversource. 

If you move and have net metering credits on your bill, you can submit a final Schedule Z form to transfer the credit balance to other Eversource accounts, including the new account you're moving to. If you choose not to do this, your credits will be used to offset net metering recovery charges for all customers.

Net metering is a separate program from the Massachusetts incentive program known as SMART but you can participate in both programs. Net metering provides monthly credits on your electric bill, where SMART sends you direct monthly incentive payments.

Please email the Eversource interconnections team at wmdg@eversource.com for answers to your net metering questions.