June 8, 2026by 0 Comments

New England Solar Glossary: 25+ Terms Defined

This glossary defines 27 essential solar energy terms that homeowners and business owners in Massachusetts and New Hampshire need to know in 2026. Each entry provides a clear definition, practical context for New England’s specific regulatory environment, and cross-references to help you navigate the transition to renewable energy. This resource serves as a specialized deep-dive extension of The Complete Guide to Solar Energy in Massachusetts and New Hampshire in 2026: Everything You Need to Know, reinforcing the technical and financial concepts required for a successful installation.

Key Takeaways for New England Solar

SMART Program: The primary incentive in Massachusetts, providing monthly payments for solar production.
Net Metering: The mechanism that allows you to bank excess energy as credits on your utility bill.
SRECs: Performance-based incentives in New Hampshire and older Massachusetts systems.
Interconnection: The formal process of linking your solar array to the local utility grid.

How This Relates to The Complete Guide to Solar Energy in Massachusetts and New Hampshire in 2026: Everything You Need to Know

This glossary provides the technical vocabulary necessary to master the concepts introduced in our The Complete Guide to Solar Energy in Massachusetts and New Hampshire in 2026: Everything You Need to Know. While the pillar guide explains the “why” and “when” of solar adoption, this dictionary clarifies the “how” by defining the specific mechanisms, like SMART and Net Metering, that drive ROI in the Northeast.

A — Financial and Regulatory Terms

SMART Program (Solar Massachusetts Renewable Target)

A performance-based incentive program in Massachusetts that pays solar owners a fixed rate per kilowatt-hour (kWh) produced for 10 to 20 years. In 2026, the SMART program remains the backbone of solar financial planning in MA, offering “adders” for battery storage and low-income property types. Unlike older programs, SMART payments come directly from the utility (National Grid, Eversource, or Unitil). Example: “By adding a Tesla Powerwall, the homeowner increased their SMART incentive rate by several cents per kWh.” See also: SREC, Net Metering

SREC (Solar Renewable Energy Credit)

A tradable certificate representing the “green” attributes of one megawatt-hour (MWh) of electricity generated by a solar system. While Massachusetts transitioned to SMART, New Hampshire still utilizes a version of SRECs, and older MA systems (SREC I and II) continue to trade these credits on the open market. According to recent market data, SREC values can fluctuate based on state-mandated renewable portfolio standards [1]. Example: “The New Hampshire homeowner sold their SRECs to an aggregator to generate additional annual revenue.” See also: SMART Program

Net Metering

A billing mechanism that credits solar energy system owners for the electricity they add to the grid. In New England, when your panels produce more than you use (common in summer), the meter runs backward. Research shows that net metering can reduce annual electricity costs by up to 100% for well-sized residential systems [2]. Example: “During the sunny month of June, the family’s net metering credits covered their entire July and August utility bills.” Not to be confused with: Gross Metering

Interconnection

The legal and technical process of connecting a solar energy system to the local utility’s electrical grid. This involves an application, a technical review by the utility, and a final “Permission to Operate” (PTO). Boston Solar manages this entire workflow in-house to ensure systems meet strict utility safety standards. Example: “The interconnection agreement was signed after the utility confirmed the local transformer could handle the 10kW solar output.” See also: PTO (Permission to Operate)

H — Technical Equipment and Performance

Inverter

A device that converts the direct current (DC) electricity generated by solar panels into alternating current (AC) used by home appliances. Modern New England systems typically use microinverters (like Enphase) or string inverters with optimizers (like SolarEdge) to combat the effects of partial shading from trees or snow. Example: “The Enphase microinverters allowed the system to maintain high production even when the lower row of panels was covered in snow.” See also: DC/AC Ratio

Battery Storage (ESS)

An Energy Storage System that captures solar energy for use during power outages or at night. In 2026, roughly 45% of new solar installations in Massachusetts include battery storage to take advantage of the ConnectedSolutions program [3]. Boston Solar specializes in Tesla Powerwall and Enphase Encharge installations for backup power. Example: “When the nor’easter knocked out the grid, the battery storage kicked in instantly to power the refrigerator and well pump.” See also: ConnectedSolutions

Critter Guard

A protective wire mesh installed around the perimeter of a solar array to prevent squirrels and birds from nesting or chewing wires. Given the high density of squirrels in suburban New England, critter guards are a standard recommendation for protecting the longevity of a residential system. Example: “After seeing a squirrel on the roof, the homeowner opted for a critter guard to protect their DC wiring.” See also: Maintenance Services

What Is the Difference Between SRECs and the SMART Program?

The primary difference lies in how the incentive is valued and paid. SRECs are market-based, meaning their value fluctuates based on supply and demand, whereas the SMART program offers a fixed, predictable rate set by the Massachusetts Department of Energy Resources (DOER). While SRECs were the standard for systems installed before 2018, the SMART program was designed to provide more financial stability for current Massachusetts residents. According to state reports, the SMART program has supported over 3,000 MW of solar capacity as of early 2026 [4].

How Does Net Metering Work in New Hampshire vs. Massachusetts?

While both states offer net metering, the compensation rates and “caps” differ significantly. In Massachusetts, most residential customers receive a 1-to-1 credit for every kWh sent back to the grid, though some commercial systems may receive a lower “net metering credit” rate of approximately 60% of the retail value. In New Hampshire, the “Net Metering 2.0” rules provide a different compensation structure where the transmission and distribution portions of the credit are valued differently than the energy portion. Data from 2025 indicates that New Hampshire residents still see a 75-90% offset of their retail rate [5].

Why Is the Interconnection Process Necessary?

Interconnection is a mandatory safety and grid-stability requirement enforced by utilities like Eversource and National Grid. It ensures that your solar system will automatically shut off during a grid outage to prevent “islanding,” which could injure utility workers attempting to fix downed lines. “The interconnection process is the most critical bridge between installation and activation,” says a Boston Solar Lead Engineer. “Our team handles over 500 successful interconnections annually to ensure every system is compliant and safe.”

Is Solar Energy Monitoring Included with All Systems?

Yes, modern solar systems installed in 2026 come with digital monitoring platforms that allow users to track production in real-time via smartphone apps. These systems, such as the Enphase Enlighten or Tesla app, provide granular data on how much energy each individual panel is producing. Boston Solar provides 24/7 monitoring services to ensure that if a component underperforms, it can be diagnosed and repaired quickly.

Frequently Asked Questions

What is a Revenue-Grade Meter?

A revenue-grade meter is a highly accurate billing meter required by the Massachusetts SMART program to measure solar production. It must meet a +/- 2% accuracy standard to ensure the utility pays the correct incentive amount.

How long does the Interconnection process take in 2026?

In Massachusetts and New Hampshire, the interconnection process typically takes between 4 to 8 weeks from the time of application to receiving Permission to Operate (PTO). This timeline can vary based on utility backlogs and the size of the system.

Can I add a battery to my solar system later?

Yes, most modern solar systems are “battery-ready,” allowing homeowners to add storage solutions like the Tesla Powerwall at a later date. However, installing them together often reduces labor costs and maximizes federal tax credit utilization.

What happens to my solar panels when it snows?

Solar panels are designed to shed snow quickly due to their glass surface and angled installation. While a heavy covering will temporarily stop production, the dark surface of the panels absorbs heat, causing snow to melt faster than on the rest of the roof.

What is an ASR (Area System Review) in New Hampshire?

An Area System Review is a technical study performed by New Hampshire utilities when a proposed solar system is large enough to potentially impact local grid stability. This usually applies to larger residential or commercial systems in areas with high solar density.

Conclusion

Understanding these terms is the first step toward a successful solar journey in New England. For a deeper look at how these components fit into the larger regional energy landscape, visit The Complete Guide to Solar Energy in Massachusetts and New Hampshire in 2026: Everything You Need to Know.

Sources:

SREC Market Report 2025: Analysis of Northeast Renewable Credits.
SEIA (Solar Energy Industries Association) Net Metering Impact Study 2024.
Massachusetts DOER SMART Program Annual Progress Report 2025.
Eversource/National Grid Interconnection Safety Standards 2026.
New Hampshire Public Utilities Commission: Net Metering 2.0 Summary Guidelines.

Related Reading:

Frequently Asked Questions

What is the SMART program?

A performance-based incentive in Massachusetts where the utility pays you a fixed rate for every kilowatt-hour your solar panels produce for 10-20 years.

How does Net Metering work?

Net Metering allows you to send excess solar energy back to the grid in exchange for credits on your utility bill, effectively ‘banking’ power for use at night or during the winter.

What is solar interconnection?

Interconnection is the formal process of getting approval from your utility company to connect your solar system to the electrical grid. It includes safety checks and the final Permission to Operate (PTO).

What is the difference between SRECs and SMART?

While both are incentives, SRECs are market-based credits sold to utilities, whereas the SMART program provides a fixed, predictable payment directly from the utility for production.

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