Solar Panel Cost in Louisiana: $2.35/W, 25.4-Year Payback

Solar in Louisiana costs about $18,800 for 8 kW at $2.35/W and pays back in roughly 25.4 years at 12.7¢/kWh with the federal credit at $0.

Updated September 2026 · Source: EIA Electric Power Monthly Table 5.6.A (July 2026 data) · next EIA update ~Oct 23

By SolarCostData Data Desk · Reviewed September 2026 · Corrections log

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Why this number

Solar panels in Louisiana cost about $2.35 per watt — $18,800 for a typical 8 kW system — and pay back in roughly 25.4 years at the state’s 12.7¢/kWh average rate, with the 2026 federal credit at $0. Exports earn avoided-cost rates well below retail here.

Everything below uses Louisiana’s real average residential electricity rate (12.7¢/kWh, EIA) and a production band of about 1,420 kWh per kW per year. Both are stated openly because they are the two inputs that decide the answer. These are estimates for sanity-checking a quote, not a quote.

Run it with your own numbers

Why Louisiana’s payback lands where it does

Louisiana’s July 2026 average of 12.7 cents per kilowatt-hour ranks 50th nationally — the single cheapest grid in the country — after falling about three percent from 13.12 cents a year earlier. Decent sun, with yield at 1,420 kilowatt-hours per installed kilowatt, isn’t enough to offset such a low rate, and the payback stretches to about 25.4 years. Entergy Louisiana, the state’s largest utility with nearly 960,000 residential customers, prices even lower than the state average at 11.1 cents, meaning Entergy’s own customers are looking at a payback longer than the statewide figure suggests. Louisiana pays for exports at the utility’s avoided cost, typically just a few cents per kilowatt-hour rather than the retail rate, so with the grid price now falling, self-consumption savings shrink too — exported power itself stays cheap to sell back regardless of how the retail rate moves.

Electric utilities in Louisiana

The state average hides real spreads between utilities. The largest residential utilities EIA-861 lists for Louisiana, with each one’s own average bundled residential price (2024 — revenue ÷ sales, the audited annual figure, not this month’s tariff):

Your utility decides Louisiana’s real number — the ZIP lookup finds it in three clicks; the 2024 annual utility averages above sit apart from the June-2026 monthly 12.7¢ state figure.

Louisiana’s rate, the last 24 months

July 2025 → July 2026: 13.12¢ → 12.72¢. The rate tracker has every month against the US average.

An 8 kW system in Louisiana, priced out

The $2.35/W used above comes from EnergySage marketplace quotes (August 2026). Those are quotes in a competitive online market, not signed contract prices.

Read that table with one caveat: $2.35/W is Louisiana’s market average, and it is the input most likely to differ for you. A quote $0.50 per watt above or below the $2.35 used here moves the payback by roughly a year and a half in either direction.

How much sun Louisiana actually gets

A kilowatt of panels in Louisiana produces about 1,420 kWh a year on an unshaded, south-facing roof at a 20-degree pitch. Sites that swap Louisiana’s 1,420 kWh for a single national average are how Arizona and Washington end up with identical paybacks despite a 1.6x real difference in output.

That figure is a five-point cluster around Louisiana’s largest metro area, which keeps it representative of where most people actually live rather than of the state’s best site.

Two adjustments matter before you apply this to your own roof:

• Shading and orientation. The 1,420 kWh figure assumes an unobstructed south-facing array. A real Louisiana roof — its own azimuth and pitch, a tree or a chimney — typically produces 10-25% less; this page models 90% of the ideal, so the 10,224 kWh/year above is already derated from 11,360. A genuinely unshaded south roof can adjust upward in the calculator.
• Year-to-year weather moves output by roughly ±5% either way.

How Louisiana compares with the other 49

Louisiana ranks 50th of 50 on electricity price and 45th on annual output value per kW installed — close enough that its rate is a fair proxy for its solar case, which is not true everywhere. No state has a lower average residential rate; the next one up is Nevada at 12.8¢.

Utah is Louisiana’s closest comparable-rate analogue — 13.1¢/kWh, roughly 1,430 kWh per kW, and a payback about 1.6 years apart (23.8 vs 25.4 years). Use it as a directional marker rather than a proxy — the gap is real.

Avoided-cost exports: the rule that decides solar in Louisiana

Louisiana does not credit exports at the retail rate — this is net billing , not net metering. The program is LPSC Distributed Generation Rules, in force since 2019-12-31, and it credits surplus power at an assumed 3.2¢/kWh, about 30% of retail, because no per-kWh figure is published — against a retail rate of 12.7¢.

Because a typical Louisiana home uses only about 40% of its generation as it is produced, most of what the panels make is sold at 3.2¢. That is why the payback above is 25.4 years rather than the 15.1 years the same hardware would return under full-retail net metering. Raising self-consumption — a battery (worth its own arithmetic: is a home battery worth it? ), an EV charged in daylight, daytime occupancy — is the lever that closes the gap. Whether a Louisiana buyer should own a battery or take a lease/TPO deal is priced in the battery buy vs. TPO calculator .

One limit worth knowing: this reflects investor-owned, state-regulated utilities; Louisiana’s municipal utilities and co-ops are exempt in most cases and set their own terms.

What is actually left in Louisiana

The 30% federal credit ended for systems completed after December 31, 2025, so it is $0 here as everywhere. What remains is state, utility and local — and it varies far more than the federal rule ever did.

Do not budget for Residential solar tax credit. Expired.

Tax exemptions

Property tax is fully exempt on the added value, so the system does not raise your assessment.

If that list looks thin, it is — the solar incentives hub shows which states still put real money on the table, and where Louisiana sits among them.

Is solar worth it in Louisiana at 12.7¢/kWh?

Louisiana has decent sun and cheap electricity, which is a frustrating combination for solar. The panels will produce; what they produce simply is not worth much at 12.7¢/kWh.

At a horizon that long, owning the roof is not the only route to cheaper power. Community solar versus rooftop walks through the subscription alternative — no roof, no loan, and no 25.4-year wait — which is worth reading before committing capital in a market like Louisiana’s.

If you want a fast gut check before running the numbers above, the should-I-go-solar screener asks the four questions that matter most in a low-rate state like Louisiana.

Two numbers put that in context. At Louisiana’s rate, the electricity an 8 kW system would produce is worth about $715 a year, so the system costs roughly 26.3 years of that output to buy outright — a simple division, before costs. The headline 25.4-year figure above is the full model: it additionally counts 2.5%/yr rate inflation, $150/yr of running costs and one inverter replacement, which is why the two differ slightly. And doing nothing is not free: 25 years of that same electricity, with rates rising at 2.5% a year, comes to about $44,405.

For a 15-year payback in Louisiana — given its sunshine rather than a national average — the electricity rate would need to be about 12.7¢/kWh. Louisiana is at 12.7¢, which is above that line.

Sources and method

• Electricity rate: U.S. Energy Information Administration, average price by state — EIA Table 5.6.A, July 2026 data (released Sep 2026). Rate shown is Louisiana’s residential average.
• Production: PVGIS v5.2 with the PVGIS-NSRDB radiation database, 1,420 kWh/kW for a five-point cluster around Louisiana’s largest metro, then the 90% real-roof factor; the assumptions, the ERA5 cross-check and the attribution are on the methodology page .
• Incentives: DSIRE — Database of State Incentives for Renewables & Efficiency, NC Clean Energy Technology Center. Verify current amounts and fund status before relying on them.
• Federal credit status: IRS, Residential Clean Energy Credit . See our 2026 energy tax credit guide .
• Payback model: shared with the solar savings calculator — 2.5%/yr utility inflation, 0.5%/yr degradation, federal credit $0.

Louisiana’s rate (12.7¢, EIA Table 5.6.A, July 2026 data (released Sep 2026)), export regime, production factor, installed cost and programs were last verified on 25 September 2026; Louisiana’s export credit resets on its tariff cycle and incentive budgets run out mid-year, so confirm current terms before acting. Not tax or financial advice.

Frequently asked questions

How we calculated this

Worked for Louisiana: 8 kW × 1,000 × $2.35/W = $18,800 gross (federal credit $0, so net before state incentives); 10,224 kWh a year × the blended kWh value at 12.7¢ retail and 3.2¢ export ≈ $715 year-1 saving; payback ≈ $18,800 ÷ $715 = 25.4 years with 2.5%/yr rate growth, 0.5%/yr degradation and one inverter replacement in the 25-year model.

Sources: U.S. Energy Information Administration (EIA) electricity rates · DSIRE incentive records · public IRS/OBBBA guidance. Figures are modeled estimates, not quotes or tax advice. See our methodology.

States with a comparable tariff picture

• Why is my electric bill so high? — Splits a bill jump into weather, rate and usage — with Louisiana’s own EIA rate history built in.
• Electricity rate tracker — Louisiana’s last 24 months of EIA rates, charted against the US average.
• Find your rate by ZIP — Louisiana averages hide utility gaps — look yours up from EIA-861 in three clicks.
• Net metering by state (2026 table) — Every state’s export regime with program, date and source — the rule behind Louisiana’s payback.
• Solar panel cost in North Dakota — Same export regime at 13.4¢/kWh and a 41.6-year payback — the closest tariff comparison to Louisiana.
• Solar panel cost in Oklahoma — Same export regime at 14.3¢/kWh and a 24.0-year payback — the closest tariff comparison to Louisiana.
• Solar panel cost in Missouri — Same export regime at 16.1¢/kWh and a 23.3-year payback — the closest tariff comparison to Louisiana.