Can I still get a federal tax credit for solar in Montana in 2026?

The federal Residential Clean Energy Credit (Section 25D) expired for systems placed in service after December 31, 2025. The only way to access federal benefits in 2026 is through a third-party-owned solar lease, where the installer retains ownership and you pay a fixed monthly rate. Homeowners who own systems installed after 2025 do not qualify for the federal credit.

Does Montana have net metering?

Montana has net metering, but it is limited. NorthWestern Energy and other utilities credit excess solar generation at the retail rate on a monthly basis. Under Montana Code Annotated 69-8-601 et seq, any unused credits remaining at the annual true-up (typically in the spring) are granted to the utility rather than paid out to the customer. Net metering rules also vary by utility, and some cooperatives have different policies. Check with your local utility for specific terms.

Will solar increase my property taxes in Montana?

Partially. Under MCA 15-6-224, Montana exempts up to $20,000 of added solar value on a single-family home from property tax assessment (not a 100% exemption). For most residential systems, the $20,000 cap covers all or most of the added value, but the legal exemption is capped, not categorical.

How long does a typical Montana solar installation take?

From initial consultation to system activation, most residential solar installations in Montana take 2 to 4 months. This includes design, permitting, equipment ordering, installation, inspection, and utility interconnection. Timeline varies based on local permitting speed and utility queue times.

What is the best season to install solar in Montana?

Spring and early summer (May through July) are ideal for installation because weather is stable and permitting is faster. However, solar works year-round in Montana. Winter installations are possible but may face weather delays. The system will generate power even in winter, though output is lower due to shorter daylight hours and snow cover.

Montana Solar Incentives, Costs & Backup Power (2026)

Q: Does Montana still offer a state tax credit for residential solar?

Montana's historical Alternative Energy System tax credit was capped at $500 for single filers and $1,000 for married filing jointly on a lifetime basis, not the much larger figure sometimes quoted online. That program has been sunset by recent legislation and is no longer available for new residential solar installations. Confirm current eligibility with the Montana Department of Revenue before relying on a state credit in your financial planning.

Montana Solar in 2026: The Honest Picture

Montana homeowners are increasingly turning to solar, but the landscape shifted significantly in 2026. The federal Residential Clean Energy Credit, which previously offered a 30% tax deduction on system costs, expired for systems placed in service after December 31, 2025. This change means that most owner-financed solar purchases installed in 2026 no longer qualify for direct federal tax benefits.

However, Montana still offers meaningful state-level incentives, and solar remains financially viable for many homeowners. The state’s property tax exemption on the added home value from solar, combined with utility rebates in NorthWestern Energy territory, creates a workable foundation for savings. Note that Montana has no general state sales tax, so there is no separate sales tax exemption to claim. The legacy state Alternative Energy System tax credit (historically $500 single / $1,000 MFJ lifetime) has been sunset and is no longer available for new residential installations. Homeowners who want federal benefits can still access them through third-party-owned leases, where an installer retains ownership and you pay a fixed monthly rate.

Montana’s solar resource is moderate but reliable. The state averages 4.8 kWh/m2/day of solar irradiance, which is lower than the Southwest but competitive with the Pacific Northwest. Missoula, Billings, and Helena receive the most consistent sunlight, while western Montana valleys experience more cloud cover and seasonal variation.

This guide covers realistic costs, state incentives, and what to expect from solar in Montana in 2026.

More worried about winter outages than payback math? See our picks for the best home backup power for Montana → — solar generators that keep the furnace fan, fridge, and Wi-Fi running through a cold-snap outage, with no permits, no roof work, and no installer required.

Average Solar System Cost in Montana (2026)

A typical 6-kilowatt residential solar system in Montana costs between $24,000 and $29,000 before incentives. This translates to approximately $4.00 to $4.85 per watt, which is in line with national averages adjusted for regional labor and permitting costs.

Cost breakdown for a 6 kW system:

Equipment (panels, inverter, racking): $12,000 to $14,000
Labor and installation: $8,000 to $10,000
Permitting, inspection, and interconnection: $2,000 to $3,000
Soft costs (design, engineering, sales): $2,000 to $2,500

After applying utility rebates (up to $1,500 from NorthWestern Energy in some service areas), net costs typically fall to $22,500 to $27,500. The legacy state Alternative Energy System tax credit has been sunset, so it should not be relied on for new 2026 installs. Financing options include cash purchase, home equity loans, solar loans, and leases. Solar loans remain popular in Montana because they spread payments over 10 to 15 years and align monthly costs with avoided electricity bills.

For current pricing in your area, consult the EnergySage state cost benchmarks for Montana.

Real Montana Homeowner Savings (Sample Scenarios)

Savings depend on your location, utility rates, system size, and electricity consumption. Here are five realistic scenarios:

Billings (NorthWestern Energy, 6 kW system)

Annual electricity cost before solar: $1,450
System cost after utility rebate: $25,000
25-year savings: $32,500
Payback period: 11.5 years

Missoula (NorthWestern Energy, 5 kW system)

Annual electricity cost before solar: $1,100
System cost after available cooperative incentives: $22,500
25-year savings: $26,000
Payback period: 12.5 years

Helena (NorthWestern Energy, 6.5 kW system)

Annual electricity cost before solar: $1,550
System cost after utility rebate: $26,500
25-year savings: $34,000
Payback period: 12.5 years

Bozeman (NorthWestern Energy, 7 kW system)

Annual electricity cost before solar: $1,650
System cost after utility rebate: $28,000
25-year savings: $36,500
Payback period: 13 years

Great Falls (NorthWestern Energy, 5.5 kW system)

Annual electricity cost before solar: $1,300
System cost after utility rebate: $24,000
25-year savings: $29,000
Payback period: 12 years

These projections assume 2% annual electricity rate increases, 0.5% annual system degradation, and no major equipment replacement. Actual savings vary based on roof orientation, shading, and local utility rate structures.

Montana Solar Incentives Still Available in 2026

Montana State Tax Credit Status

Montana’s historical residential Alternative Energy System tax credit was modest by design, capped at $500 for single filers and $1,000 for married filing jointly on a lifetime basis (not the much larger annual figure sometimes quoted by out-of-state marketing copy). That program has been sunset by recent legislation and is no longer available for new residential solar installations. Before relying on a state credit, confirm current eligibility with the Montana Department of Revenue or the DSIRE database. For 2026, this site treats the Montana state tax credit as unavailable for new installs.

Property Tax Exemption

Montana law (MCA 15-6-134) exempts the added home value from solar installations from property tax assessment. This means your property tax bill will not increase due to the solar system. This exemption is automatic; you do not need to file a separate application.

Sales Tax

Montana has no general state sales tax. There is no separate solar sales tax exemption to claim because there is no sales tax to begin with. Be cautious of installers or marketing materials that list a “Montana solar sales tax exemption” as a distinct incentive, this is not a real line item of savings.

Utility Rebates and Incentives

NorthWestern Energy, which serves much of Montana, offers rebates for residential solar installations. Rebate amounts vary by service territory and system size, ranging from $500 to $1,500. Flathead Electric Cooperative and other local utilities may offer additional rebates or time-of-use rate discounts for solar customers. Contact your utility directly for current programs.

Net Metering

Montana has net metering, but it is limited compared to other states. NorthWestern Energy credits excess solar generation at the retail rate on a monthly basis. Critically, under MCA 69-8-601 et seq, any unused net metering credits remaining at the annual true-up are granted to the utility rather than paid out or rolled over. In practice, this means you should size your system to match (not exceed) your annual usage, since overproduction effectively donates electricity to the utility. Net metering rules also vary by utility, so verify your utility’s specific policy before installing.

For a comprehensive list of Montana incentives, visit the DSIRE state incentive database.

Is Solar Worth It in Montana Without the Federal Credit?

The loss of the federal Residential Clean Energy Credit in 2026, combined with the sunset of Montana’s state Alternative Energy System tax credit, reduces but does not eliminate solar’s financial appeal in Montana. The payback period has extended from approximately 8 to 9 years (with both credits available) to 11 to 13 years (with utility rebates and property tax exemption only).

Decision framework:

If you plan to stay in your home for 13+ years: Solar is financially sound. You will recoup your investment and generate significant savings in years 14 to 25.
If you plan to stay for 11 to 13 years: Solar breaks even or slightly exceeds payback. Savings are modest but positive.
If you plan to move within 11 years: Solar may not be cost-effective unless you can transfer the lease or sell the system with the home.

Homeowners who want federal benefits in 2026 should consider a third-party-owned solar lease. In this model, the installer retains ownership and you pay a fixed monthly rate (typically $100 to $150 per month for a 6 kW system). The installer claims the federal investment tax credit (Section 48E, available for systems where construction begins before July 4, 2026) and passes savings to you through lower lease payments. Leases eliminate upfront costs and maintenance responsibility, though you do not own the system.

For more details on federal credit options, see the IRS Section 25D guidance.

Top Cities for Solar in Montana

Billings: Highest solar irradiance in Montana (5.0+ kWh/m2/day), strong NorthWestern Energy rebate programs, and growing installer base. Average payback: 11.5 years.
Missoula: Moderate solar resource (4.6 kWh/m2/day), competitive electricity rates, and active solar community. The city itself is served primarily by NorthWestern Energy (not Missoula Electric Cooperative, which serves areas around the city). Average payback: 12.5 years.
Bozeman: Good solar potential (4.8 kWh/m2/day), higher electricity costs, and strong demand for renewable energy. NorthWestern Energy service area. Average payback: 13 years.
Helena: Moderate solar resource (4.7 kWh/m2/day), state capital with supportive policies, and established solar market. Average payback: 12.5 years.
Great Falls: Solid solar irradiance (4.9 kWh/m2/day), NorthWestern Energy service area, and lower installation costs than larger cities. Average payback: 12 years.
Kalispell: Northern location with moderate solar resource (4.5 kWh/m2/day), Flathead Electric Cooperative service area, and growing installer network. Average payback: 13 years.

For detailed solar resource data by location, consult the NREL solar resource maps.

What to Look for in a Montana Solar Installer

Montana Licensing and Bonding: Verify that the installer holds a current Montana electrical contractor license and is bonded. Check the Montana Department of Labor and Industry website for license verification.
NorthWestern Energy Certification: If you are in NorthWestern Energy territory, confirm that the installer is certified for their rebate program. This ensures you receive available rebates without delays.
Experience with Local Permitting: Montana permitting varies significantly by county and city. Choose an installer with a track record in your specific jurisdiction. Ask for references from recent projects in your area.
Transparent Pricing and Financing: Obtain written quotes from at least three installers. Compare total system cost, equipment specifications, warranty terms, and financing options. Avoid installers who pressure you into same-day decisions.
Warranty Coverage: Confirm that the system includes at least a 10-year workmanship warranty and 25-year equipment warranty on panels and inverter. Verify that warranties are transferable if you sell your home.
Post-Installation Support: Ask about monitoring, maintenance, and customer service. A good installer provides online monitoring, annual inspections, and responsive support for 25+ years.
Insurance and References: Request proof of general liability insurance and workers’ compensation. Ask for at least three customer references and verify them independently.

Next Steps for Montana Homeowners

To get started:

Enter your address and recent electricity bill
Receive quotes from 3 to 5 local installers
Compare costs, incentives, financing, and warranties
Ask questions and request references
Choose the installer that best fits your needs and budget

Getting multiple quotes typically takes 10 to 15 minutes and costs nothing. Most installers provide free site assessments and detailed proposals within 5 to 7 business days.

Want solar power without the installer process at all? A solar generator pairs portable panels with a battery in one box that ships to your door — no permits, no roof work, no sales calls. See our Montana backup power guide for the sizes that fit Montana homes and outage risks.

Sources for 2026 data: IRS, DSIRE (Database of State Incentives for Renewables & Efficiency), Montana Department of Revenue, Montana Department of Labor and Industry, NorthWestern Energy, SEIA (Solar Energy Industries Association), NREL (National Renewable Energy Laboratory), EnergySage.

Incentive	Type	Amount
Montana Alternative Energy System Tax Credit (Sunset)	State Income Tax Credit	Historically $500 single / $1,000 MFJ lifetime; program has been sunset and is no longer available for new installations. Verify status with the Montana Department of Revenue before claiming.
Property Tax Exemption for Solar (Capped)	Property Tax Exemption	Up to $20,000 of added solar value exempt on single-family homes under MCA 15-6-224 (not a 100% exemption)
NorthWestern Energy Rebate Program	Utility Rebate	Up to $1,500 depending on system size and location
Net Metering (Limited)	Grid Credit	1:1 monthly credit for excess generation; under MCA 69-8-601 et seq, any unused credits remaining at the annual true-up are granted to the utility (no cash payout)