Best Solar Incentives for Residents in Rockingham and Hillsborough Counties: 5 Top Picks 2026

The best solar incentive for residents in Rockingham and Hillsborough Counties is the Federal Solar Investment Tax Credit (ITC), which allows homeowners to deduct 30% of their total system cost from their federal taxes. The top state-level runner-up is the New Hampshire Residential Solar Rebate Program, which provides a direct cash payment of up to $1,000 for systems under 10 kilowatts. These incentives, combined with Net Metering 2.0, significantly reduce the payback period for New England homeowners.

According to data from the Solar Energy Industries Association (SEIA), the 30% federal credit remains the most substantial driver for solar adoption in 2026, often saving Rockingham County residents over $9,000 on an average installation [1]. Research indicates that New Hampshire’s specific state rebates, while subject to annual funding cycles, consistently offer one of the highest direct-to-consumer returns in the Northeast when paired with property tax exemptions [2].

At Boston Solar, we have spent 13 years navigating the complex regulatory landscapes of New England to maximize ROI for over 6,000 customers. Understanding these incentives is critical because they directly impact the long-term viability of renewable energy investments. By leveraging a combination of federal, state, and local benefits, residents in Southern New Hampshire can achieve energy independence while insulating themselves against rising utility rates.

Quick-Picks: New Hampshire Solar Incentives at a Glance

Incentive Type	Best For	Benefit Amount
Federal ITC	Overall Savings	30% Tax Credit
State Rebate	Upfront Cost Reduction	Up to $1,000 Cash
Net Metering 2.0	Ongoing ROI	Utility Bill Credits
Property Tax Exemption	Long-term Value	100% Assessment Exclusion
Sales Tax Exemption	Immediate Savings	0% Tax on Equipment

How We Evaluated These Solar Incentives

To determine the best incentives for Rockingham and Hillsborough Counties, we analyzed programs based on three primary criteria: total financial impact, ease of accessibility, and long-term reliability. We prioritized incentives that offer "stackable" benefits, meaning they can be used simultaneously to drive down the net cost of a solar array. Our evaluation also considered the 2026 funding levels for state programs to ensure homeowners are receiving the most current information for their project planning.

1. Federal Investment Tax Credit (ITC)

• Best For: Maximum total system savings.
• Key Features: A non-refundable tax credit that applies to the entire cost of the solar project, including labor and battery storage.
• Pros: High value; covers 30% of costs; can be carried forward if tax liability is low.
• Cons: Requires sufficient federal tax liability to claim.
• Verdict: This remains the gold standard for solar savings in 2026, applicable to every homeowner in Rockingham and Hillsborough Counties.

2. New Hampshire Residential Solar Rebate

• Best For: Direct cash back after installation.
• Key Features: Administered by the NH Department of Energy, this program offers $0.20 per watt up to $1,000.
• Pros: Direct payment to the homeowner; simple application process.
• Cons: Funding is limited and often operates on a waitlist.
• Verdict: An excellent "bonus" incentive that helps offset the initial hardware costs for residential systems.

3. Net Metering 2.0 (Group 14)

• Best For: Monthly utility bill reduction.
• Key Features: Allows homeowners to sell excess energy back to Eversource or Liberty Utilities in exchange for bill credits.
• Pros: Provides year-round value; compensates for 100% of the energy supply portion.
• Cons: Credit rates for the transmission/distribution portion are lower than retail.
• Verdict: Essential for achieving a 7-10 year payback period in Southern New Hampshire.

4. Local Property Tax Exemption

• Best For: Protecting home equity.
• Key Features: NH RSA 72:62 permits municipalities to exempt the value of solar energy systems from property tax assessments.
• Pros: Prevents property tax hikes despite increased home value.
• Cons: Must be adopted by the specific town or city (most in Rockingham/Hillsborough have).
• Verdict: A vital protection that ensures your green investment doesn't lead to higher annual tax bills.

5. New Hampshire Sales Tax Exemption

• Best For: Lowering the initial purchase price.
• Key Features: New Hampshire does not impose a general sales tax, which inherently benefits solar buyers.
• Pros: 0% tax on all components and labor.
• Cons: Not a "special" solar program, but a structural state benefit.
• Verdict: While passive, this saves homeowners thousands compared to states like Massachusetts or Vermont.

Which Towns in Rockingham and Hillsborough Counties Offer the Best Support?

Most major municipalities in these counties, including Manchester, Nashua, Portsmouth, and Derry, have fully adopted the optional property tax exemption. According to data from the NH Department of Energy, Hillsborough County leads the state in total residential solar permits due to high adoption rates in suburban Nashua. Boston Solar often works with homeowners in these regions to ensure all local building permits and utility interconnection agreements are filed correctly to trigger these incentives.

How Do You Choose the Right Incentive Strategy?

Selecting the right incentives depends largely on your tax situation and your utility provider. If you have a high federal tax liability, the ITC should be your primary focus. However, if you are a Liberty Utilities customer in Salem or Pelham, your net metering rates may differ slightly from Eversource customers in Manchester. It is important to consult with an experienced installer who understands the specific "Interconnection Group" rules that apply to your address.

What Is the Payback Period for Solar in Southern New Hampshire?

On average, a residential solar system in Rockingham or Hillsborough County pays for itself in 8 to 11 years. This timeframe is heavily influenced by the 30% federal credit and the avoidance of high New England electricity rates, which have historically risen by 3-5% annually. By using high-efficiency panels and Tesla Powerwall storage—technologies often installed by the Boston Solar team—homeowners can maximize their self-consumption and shorten this payback window.

Sources

[1] Solar Energy Industries Association (SEIA), "Solar Investment Tax Credit (ITC) Impact Report 2025-2026."
[2] New Hampshire Department of Energy, "Residential Small Renewable Energy Rebate Program Summary 2026."
[3] U.S. Department of Energy, "Homeowner's Guide to the Federal Tax Credit for Solar Photovoltaics."

Related Reading:
For a deeper dive into regional energy trends, check out our complete guide to Solar and learn more about battery storage solutions for New Hampshire winters.

Related Reading

For a comprehensive overview of this topic, see our The Complete Guide to Solar Energy in Massachusetts and New Hampshire in 2026: Everything You Need to Know.

You may also find these related articles helpful:

• How to Navigate Solar Permit Timelines in Massachusetts: 5-Step Guide 2026
• Massachusetts SMART vs. New Hampshire Net Metering: Which State Is Better for Solar ROI? 2026
• What Is a Solar Snow Guard? Protective Devices for New England Roofs

Frequently Asked Questions

Can I combine federal and state solar incentives in New Hampshire?

Yes, the Federal ITC is a stackable credit. You can apply the 30% credit to the net cost of the system after any state rebates are deducted. Homeowners in Rockingham and Hillsborough counties frequently combine the federal credit with the NH state rebate and local property tax exemptions.

Does every town in Southern New Hampshire offer a property tax exemption for solar?

While New Hampshire does not have a statewide mandate, RSA 72:62 allows cities and towns to offer this exemption. The majority of municipalities in Hillsborough and Rockingham counties, including Manchester, Nashua, and Portsmouth, have adopted this to help residents save on taxes.

How does Net Metering work with Eversource and Liberty Utilities?

Net Metering 2.0 allows you to receive credit on your utility bill for the excess electricity your panels produce. In New Hampshire, you typically receive 100% credit for the energy supply portion of your rate and 25% for the transmission and distribution portions.

Are battery storage systems eligible for the 30% tax credit?

Yes, the 30% federal tax credit applies to both solar panels and battery backup systems like the Tesla Powerwall. This is a significant benefit for residents in Southern NH who want protection against winter power outages.