Scenario: a $300/month electric bill. Assumes 3%/yr rate increases, 0.5%/yr panel degradation and no federal tax credit (the 30% §25D credit ended for systems installed after Dec 31, 2025). How we calculate
Data approachEIA rates · NREL sun hours · 2026 federal policy · methodology
A $300/month electricity bill in New Hampshire represents roughly 1,120 kWh per month at the state average rate of 26.79¢/kWh (EIA, Jan–Jul 2026 year-to-date). With 4.2 peak sun hours per day, offsetting that usage takes about a 10.7 kW solar system — roughly 27 panels at 400W — costing about $32,100 installed. Because the 30% federal tax credit ended for systems installed after 2025 and New Hampshire has full retail net metering, simple payback is about 10.2 years, with an estimated $74,700 net over 25 years.
How Many Solar Panels for a $300 Electric Bill in New Hampshire?
New Hampshire electricity rates and sun hours change the math versus the US average. The sizing formula:
System size (kW) = Annual kWh ÷ (Peak sun hours × 365 × 0.82)
For a $300/month bill in New Hampshire:
Annual usage: ~13,438 kWh/year
Peak sun hours: 4.2 h/day (New Hampshire)
System size:10.7 kW DC (~27 × 400W panels)
Metric
New Hampshire
US average
Rate
26.79¢/kWh
18.19¢/kWh
Sun hours
4.2 h/day
4.5 h/day
System size
10.7 kW
14.7 kW
Panels (400W)
27
37
New Hampshire requires a smaller system than the national average for the same dollar bill because higher rates reduce required kWh. Use our solar system size calculator with your ZIP code for a roof-specific result.
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💰 System Cost
What Does Solar Cost for a $300/Month Bill in New Hampshire in 2026?
At about $3.00/W installed (a blended 2026 US price; marketplace quotes often run lower), a 10.7 kW system in New Hampshire costs about $32,100.
The 30% federal Residential Clean Energy Credit (IRC §25D) ended for systems installed after December 31, 2025, so a solar system you buy and install in 2026 gets no federal tax credit. Leases and PPAs are different: the installer that owns the system can still claim the commercial §48E credit for systems placed in service by the end of 2027 and may pass part of that value on through a lower monthly price.
Cost line
Amount
Installed cost (10.7 kW)
$32,100
Federal credit (25D) for 2026 installs
$0
Your cost before state/local incentives
$32,100
Getting three or more quotes matters more than ever without the federal credit: installed prices for the same system often differ by 20–30%.
📈 Payback Period
How Long Is Solar Payback on a $300 Bill in New Hampshire?
Simple payback divides installed cost by first-year bill savings. New Hampshire’s net metering credits most of the retail rate for small residential systems. We therefore assume solar offsets about 87% of a $300/month bill in New Hampshire — roughly $3,132/year — for a simple payback of about 10.2 years.
Over 25 years, with 3% annual rate increases and 0.5%/year panel degradation, cumulative bill savings minus the installed cost come to about $74,700. Full retail net metering means each kWh you produce is worth close to your retail rate. Model your own numbers in our solar payback calculator.
Solar vs utility company · 25-year comparison
25-year totals for a $300/month electric bill: 3%/yr rate increases, 0.5%/yr degradation, no federal credit. Methodology
New Hampshire Solar Incentives for a $300/Month Electric Bill
State and local incentives: New Hampshire’s residential renewable rebate pays $0.20 per watt up to $1,000 when funding is available, and some towns offer property-tax exemptions.
Net metering: New Hampshire’s net metering credits most of the retail rate for small residential systems.
Check DSIRE and our New Hampshire solar page for current rebates, net metering rules, and utility-specific programs before signing an install contract.
⚡ System Size
New Hampshire vs US Average: $300/Month Bill Comparison
New Hampshire
US average
Monthly bill
$300
$300
System size
10.7 kW
14.7 kW
Installed cost
$32,100
$44,100
Bill offset assumed
87%
75% (blended)
Simple payback
10.2 yrs
16.3 yrs
25-year net savings
$74,700
$48,000
Bottom line: A $300/month bill in New Hampshire is a reasonable solar candidate with about 10.2-year payback in 2026. Calculate your New Hampshire savings or compare all states on the $300 bill hub.
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Direct answers for US homeowners in New Hampshire.
At New Hampshire's average rate of 26.79¢/kWh and 4.2 peak sun hours, a $300/month bill (~13,438 kWh/year) typically requires a 10.7 kW system — about 27 panels at 400W each. Use our solar system size calculator with your ZIP for a roof-specific estimate.
A 10.7 kW system in New Hampshire costs roughly $32,100 installed at about $3.00 per watt. The 30% federal tax credit (25D) ended for systems installed after December 31, 2025, so there is no federal credit for a system you buy in 2026. New Hampshire's residential renewable rebate pays $0.20 per watt up to $1,000 when funding is available, and some towns offer property-tax exemptions.
At $32,100 installed and ~$3,132/year in bill savings, simple payback in New Hampshire is about 10.2 years. New Hampshire's net metering credits most of the retail rate for small residential systems.
With about 10.2-year payback and roughly $74,700 in estimated 25-year net savings, a $300/month bill in New Hampshire is a reasonable case for buying solar in 2026. See the [New Hampshire solar page](/states/nh/) for net metering and incentive details.
The US average needs a 14.7 kW system at 16.3-year payback. New Hampshire needs 10.7 kW with 10.2-year payback — driven by New Hampshire's 26.79¢/kWh rate and 4.2 daily sun hours.
26.79¢/kWh — New Hampshire average residential price. Source: EIA Electric Power Monthly, Table 5.6.B (year-to-date through July 2026), residential average retail price (July 2026) (EIA)
Solar production
4.2 peak sun hours/day × 0.82 system derate. Approximate state-average daily solar resource (peak sun hours) based on NREL solar resource data (NSRDB); not location-specific — use NREL PVWatts for an address-level estimate. (NREL PVWatts)
Installed price
$3.00 per watt before incentives. Blended 2026 US residential installed price used by this site; EnergySage marketplace reported about $2.60/W (mid-2026); full-market medians are higher.
Federal tax credit
$0 for homeowner-owned systems installed in 2026 — the 30% §25D credit ended Dec 31, 2025 (IRS)
Net metering
Full retail net metering — solar assumed to offset 87% of the bill. New Hampshire's net metering credits most of the retail rate for small residential systems.
Estimates only — not tax, legal or financial advice. Get at least three installer quotes and confirm incentives with your utility and a tax professional.