How Net Metering Works in Massachusetts (2026 Guide to Solar Credits)
How Net Metering Works in Massachusetts (2026 Guide to Solar Credits)
Quick Definition: Net Metering in Massachusetts
Net metering is a billing policy that allows homeowners with solar panels to receive credits on their electric bill for excess electricity their solar system sends to the power grid.
When solar panels produce more electricity than a home is using, that extra energy flows to the utility grid. The utility then issues credits that can be used later when the home needs electricity from the grid.
In Massachusetts, most residential solar systems receive full retail-rate net metering credits, which allows homeowners to offset nearly all of their annual electricity usage.
What Is Net Metering?
Net metering is one of the most important policies supporting residential solar energy.
It allows homeowners to receive electric bill credits for excess solar electricity exported to the grid.
When your solar panels generate electricity:
- Your home uses solar power first.
- Any extra electricity flows to the electric grid.
- Your utility tracks that exported energy.
- Your electric bill receives credits for the electricity sent to the grid.
Those credits can later be used when your home draws electricity from the grid — such as at night or during cloudy weather.
This system allows solar homeowners to balance their electricity usage throughout the year.
How Net Metering Works in Massachusetts
Massachusetts has one of the strongest net metering policies in the United States.
Most residential solar systems receive 1-to-1 retail credits, meaning every kilowatt-hour (kWh) of electricity exported to the grid offsets a kilowatt-hour you would normally purchase from your utility.
These credits typically include:
- Electricity supply charges
- Distribution charges
- Transmission charges
Because of this structure, homeowners with properly sized solar systems can often reduce their electric bill close to zero on an annual basis.
Major Net Metering Update: Systems Up to 25 kW Now Qualify
Massachusetts recently expanded its net metering eligibility.
Previously, residential systems were limited to 10 kW to qualify for guaranteed net metering benefits.
The Massachusetts Department of Public Utilities increased this threshold to:
25 kW for residential solar systems
This change allows homeowners to install larger solar systems that can support:
- Electric vehicles
- Heat pump heating systems
- Electrified water heating
- Pool equipment
- Future electricity usage increases
For many homeowners, this expansion provides much greater flexibility when designing a solar system.
Seasonal Solar Production in Massachusetts
Solar production varies significantly throughout the year in Massachusetts.
During summer months, solar systems often produce more electricity than a home consumes.
During winter months, shorter days and snow can reduce solar output.
Net metering allows homeowners to bank excess summer production and use those credits during winter.
Example:
Month Solar Production Home Usage Net Metering Credit July 1,200 kWh 900 kWh 300 kWh credit January 400 kWh 900 kWh Uses 500 kWh credit Because of this system, solar arrays can be sized to offset annual electricity usage, even though production varies by season.
Do Net Metering Credits Expire?
In Massachusetts, unused net metering credits typically roll forward month to month on your utility account.
This allows homeowners to accumulate credits during sunny months and gradually use them during the winter.
If excess credits remain after an annual billing cycle, utilities may compensate them at an avoided cost rate, which is lower than the retail electricity rate.
For this reason, most solar systems are designed to offset close to 100% of annual electricity usage.
Net Metering Caps in Massachusetts
Historically, Massachusetts placed limits on how much solar generation could participate in net metering.
However, most residential systems are now cap-exempt if they are 25 kW or smaller.
Net metering caps primarily affect larger projects such as:
- Commercial solar installations
- Community solar farms
- Municipal solar projects
Most residential rooftop solar systems are not impacted by these limits.
Utilities That Offer Net Metering in Massachusetts
The major utilities offering net metering include:
- Eversource
- National Grid
- Unitil
Homeowners served by these utilities can participate once their solar system is installed and approved for interconnection.
Municipal utilities may operate under different solar policies.
Net Metering vs SMART 3.0: What’s the Difference?
Many Massachusetts homeowners confuse net metering with the SMART solar incentive program, but they serve different purposes.
Both programs work together to increase solar savings.
Net Metering
Net metering provides electric bill credits for excess electricity exported to the grid.
These credits help reduce or eliminate your monthly electric bill.
SMART Program
SMART (Solar Massachusetts Renewable Target) is a state incentive program that pays solar owners based on the electricity their system produces.
Instead of bill credits, SMART provides performance-based payments per kilowatt-hour generated.
These payments are typically issued for 10 to 20 years depending on the program block and system size.
How They Work Together
Most Massachusetts solar homeowners benefit from both programs simultaneously.
Program Benefit Net Metering Reduces your electric bill SMART Provides additional solar production payments Together, these incentives dramatically improve the financial return of installing solar panels.
Net Metering vs Battery Storage
Battery storage is becoming more popular, but it serves a different purpose than net metering.
Net Metering
Net metering allows homeowners to send excess solar electricity to the grid and receive bill credits.
It effectively turns the electric grid into a virtual battery across seasons.
However, net metering does not provide power during outages.
Battery Storage
Solar batteries store electricity inside your home for later use.
Batteries allow homeowners to:
- Use solar energy at night
- Provide backup power during outages
- Reduce reliance on the grid
- Manage electricity usage during peak pricing periods
Do You Need a Battery in Massachusetts?
Because Massachusetts has strong net metering policies, most homeowners install solar first and consider adding battery storage later for backup power.
Why Net Metering Makes Solar So Valuable
Net metering dramatically increases the value of solar energy.
Without net metering, homeowners would only benefit from solar electricity at the exact moment it is produced.
Net metering allows solar systems to offset electricity usage across the entire year by banking excess production as bill credits.
This policy is one reason Massachusetts consistently ranks among the top solar states in the country.
Frequently Asked Questions About Net Metering in Massachusetts
Does Massachusetts still offer net metering?
Yes. Net metering remains available for residential solar systems in Massachusetts, and systems up to 25 kW now qualify for cap-exempt net metering.
Do net metering credits expire?
Unused credits typically roll forward month to month, allowing homeowners to use summer production credits during winter months.
Do solar panels eliminate my electric bill?
Solar panels combined with net metering can offset most or all of your annual electricity usage, though utilities typically still charge a small monthly service fee.
What happens if my solar system produces more electricity than I use?
The excess electricity is exported to the grid and becomes net metering credits on your electric bill, which can be used later when your home needs electricity from the grid.
Can I oversize my solar system to generate extra credits?
Solar systems are usually designed to offset close to 100% of annual electricity usage. Oversizing significantly beyond usage is generally not recommended because utilities may compensate excess production at lower rates.
Do all Massachusetts utilities offer net metering?
The major utilities offering net metering are:
- Eversource
- National Grid
- Unitil
Municipal utilities may operate under separate solar programs.
Thinking About Installing Solar in Massachusetts?
Understanding net metering is a key step when considering solar.
A professional solar analysis can estimate:
- Your solar production
- Your expected net metering credits
- Your potential electric bill savings
- Your eligibility for Massachusetts solar incentives
At Viridis Energy, we specialize in designing solar systems specifically for Massachusetts homeowners — optimizing system size, production, and incentives to maximize long-term savings.
Final Thoughts
Net metering is one of the most powerful policies supporting solar energy in Massachusetts.
By allowing homeowners to earn credits for excess electricity sent to the grid, it enables solar systems to offset electricity usage across the entire year.
Combined with modern solar technology and incentive programs like SMART, net metering continues to make solar one of the most effective ways for Massachusetts homeowners to control rising electricity costs.
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