Solar in Billings, MT: 2026 Cost, Savings & Payback
Calculate 2026 solar panel cost, payback, and 25-year bill savings in Billings, Montana. Based on an estimated 5.1 peak sun hours/day, a 13.7¢/kWh planning electricity rate, NorthWestern Energy as the likely utility, and current IRS guidance for the ended federal residential clean energy credit.
Solar in Billings, MT: quick answer
A typical 6kW solar system in Billings costs about $16,500 before local or state incentives. For 2026 installs, the federal residential clean energy credit is modeled as $0, so the estimated cost remains about $16,500 before any local incentive. It produces about 8,935 kWh per year from 5.1 peak sun hours/day, saves about $1,222 per year, and reaches payback in about 13.5 years.
2026 6kW Cost
$16,500
Monthly Savings
$102
Production / kW
1,489 kWh
Panel Count
~15
5.1
Peak Sun Hours/Day
13.7¢
Planning Rate (¢/kWh)
13.5 yr
Payback Period
$41k
25-Year Savings
Billings Solar Overview
Calculate Your Billings Solar Savings
Billings average: $109/mo
South-facing roofs produce the most energy
Add $8,000-$12,000 for whole-home battery backup
Annual Production
kWh/year
Annual Savings
per year
Net System Cost
no 2026 federal credit applied
Payback Period
break-even time
Bill Offset and Export Assumptions
Current Annual Bill
$1,308
Estimated Usage
9,561 kWh
Bill Offset
92%
Used On Site
100%
Exported production is discounted in this planning model instead of being treated as a guaranteed one-for-one bill credit. For Billings, verify the current NorthWestern Energy export-credit method and any fixed monthly charges before relying on the payback number.
25-Year Total Savings
$41,092
Monthly Savings
$100
2026 Federal Credit
$0
Cumulative Savings vs System Cost
Cost Breakdown
| Item | Billings | National Avg |
|---|---|---|
| Gross System Cost (6kW) | $16,500 | $17,100 |
| 2026 Federal Residential Credit | -$0 | $0 |
| Net System Cost | $16,500 | $17,100 |
| Cost Per Watt | $2.75/W | $2.85/W |
Solar Potential in Billings
Sun Hours vs National Average
Billings gets 13% more sun than the national average.
Climate Advantages
- About 153 sunny days per year (planning estimate)
- Estimated average temperature: 53.8°F, cooler temps actually improve panel efficiency
- Assumed roof size: 1,544 sq ft, enough for a 85-panel system
Billings Solar Incentives & Programs
Federal Residential Clean Energy Credit (Section 25D)
For 2026 planning, JouleIO does not subtract a federal residential clean energy credit. The IRS says the Residential Clean Energy Credit was 30% for eligible property installed from 2022 through December 31, 2025, and is not available for property placed in service after December 31, 2025.
Source: IRS Residential Clean Energy Credit and IRS One Big Beautiful Bill provisions.
Montana State Incentives
Montana property tax exemption for solar; net metering at retail rate
Net Metering: NorthWestern Energy
JouleIO's planning data marks net metering or a solar export credit as available for NorthWestern Energy customers in Billings. Export credits can be at retail or below-retail rates depending on the current tariff, so confirm terms with the utility that serves your address.
Environmental Impact in Billings
3.7
Tons CO2 Offset/Year
61
Equivalent Trees Planted
0.8
Homes Worth of Energy
Based on 8,935 kWh annual production with a 6kW system. EPA average: 0.417 metric tons CO2 per MWh, 10,632 kWh per US home.
Solar Energy in Billings, Montana
Billings, Montana receives an average of 5.1 peak sun hours per day, providing excellent conditions for residential solar installations. With a planning electricity rate of 13.7¢ per kWh (EIA Montana residential average for 2026-06: 15.14¢; U.S. average 18.34¢), below the national average, so payback is slower even with this calculator's 2.5% annual rate-increase assumption.
A typical 6kW solar system in Billings produces approximately 8,935 kWh per year, saving homeowners an estimated $1,203 annually. The system pays for itself in about 13.7 years, after which you enjoy essentially free electricity for the remaining 11+ years of the system's warranty life.
JouleIO's dataset carries a modeled solar-adoption value of 3.5% for Billings. It is a rough planning placeholder, not a measured count of local installations, so use utility interconnection data or installer quotes if local adoption matters to your decision.
Other Cities in Montana
Methodology & Solar Data Sources for Billings
How we calculate Billings solar potential and savings: Annual production = system kW × estimated peak sun hours × 365 × 0.80 system derate × a roof-orientation factor. This is a simplified planning formula, not a PVWatts run for your address. Cost uses a planning price per watt for Montana, and bill savings use a planning electricity rate of 13.7¢/kWh (the EIA Montana residential average for 2026-06 is 15.14¢/kWh).
- Peak sun hours for Billings (5.1/day) are a planning estimate in the typical range for Montana, not a site-specific NREL NSRDB value. Enter your address in NREL PVWatts for a location-specific production estimate.
- System sizing defaults to a 6kW residential rooftop system with roughly 400W panels; adjust the size and monthly bill to match your home.
- Federal tax credit: modeled as 0% for 2026 residential installations because IRS guidance says the Residential Clean Energy Credit is not available for property placed in service after December 31, 2025.
- Exports are discounted rather than credited 1:1 at retail, because many utilities have shifted to net billing or avoided-cost export rates. Verify your utility's current tariff.
- 25-year savings assume a 2.5% annual electricity-rate increase and do not subtract panel degradation, inverter replacement, or maintenance.
Authoritative US solar data sources:
- NREL PVWatts Calculator, official US solar production estimator
- NREL National Solar Radiation Database, site-level solar irradiance data for checking your address
- IRS Residential Clean Energy Credit, 2026 federal residential credit status
- IRS One Big Beautiful Bill provisions, clean energy credit expiration overview
- DSIRE, State Solar Incentives, searchable database for Montana
- EIA Electric Power Monthly Table 5.6.A, Montana residential average price
- ENERGY STAR Solar, efficient solar product database
Solar Disclaimer: Solar savings vary based on roof orientation, shading, system quality, installer markup, financing terms, utility rate plan, and policy changes. Always get 3+ quotes from NABCEP-certified installers and review contracts carefully. Tax credit eligibility depends on tax liability, consult a tax professional.
Reviewed by Marcus Delacroix · Last updated 2026 · Sun-hour and rate inputs are planning estimates; EIA state rate period 2026-06
Frequently Asked Questions
How much do solar panels cost in Billings, MT?
The average cost of a 6kW solar panel system in Billings is approximately $16,500 before local or state incentives ($2.75/watt). For 2026 planning, this calculator does not subtract a federal residential clean energy credit because IRS guidance says the credit is not available for property placed in service after December 31, 2025. Montana property tax exemption for solar; net metering at retail rate
How many solar panels do I need in Billings, MT?
A typical 6kW residential solar system in Billings needs about 15 panels if each panel is rated near 400 watts. That system produces about 8,935 kWh per year in this estimate, or roughly 1,489 kWh per installed kW before shading, roof orientation, and inverter losses are customized.
How many peak sun hours does Billings get?
JouleIO models Billings, MT at about 5.1 peak sun hours per day and roughly 153 sunny days per year. These are planning estimates, not site measurements, so check your exact address in NREL PVWatts. This is above the national average of 4.5 hours, making it an excellent location for solar energy.
What is the solar payback period in Billings?
The average solar payback period in Billings is approximately 13.5 years for a 6kW cash-price estimate before local or state incentives. After payback, your solar panels generate essentially free electricity for the remaining warranty life. Over 25 years, bill savings can reach about $41,741 before subtracting installation cost.
Does Billings have net metering?
JouleIO's planning data marks net metering or a solar export credit as available in Billings, where NorthWestern Energy is the likely utility (verify for your address). Export credits may be at retail or below-retail rates depending on the current tariff, and fixed monthly charges still apply.
Is solar worth it in Billings, MT in 2026?
It can be. The 13.5-year estimated payback is moderate, so the decision depends on quote quality, financing terms, roof condition, and local incentives. For 2026 installs, JouleIO does not assume a federal residential credit; local incentives and net metering are the main financial drivers.