Data approachEIA rates · NREL sun hours · 2026 federal policy · methodology
A typical 9 kW solar system in Mississippi costs about $27,000 installed in 2026 and saves roughly $996 in year one, a simple payback near 27 years. The 30% federal residential solar credit ended for systems installed after Dec 31, 2025, Mississippi has no state solar tax credit, and Entergy Mississippi credits exported power at about 5.5 cents per kWh, well below the roughly 14-cent retail rate.
Mississippi has good sun, about 4.8 peak sun hours a day in our model, but electricity costs roughly 14 to 15 cents per kWh in recent EIA data, well below the U.S. residential average of about 18 cents. Cheaper power and low export credits limit what each kWh of solar is worth, and without the federal credit, a typical system now takes more than two decades to pay for itself.
That does not rule solar out. Households with large daytime loads, a low installation quote, or a strong interest in backup power can still find it worthwhile. This guide shows the numbers so you can decide. All figures come from our standard savings model and the inputs on our Mississippi solar data page; the assumptions are listed in the payback section.
📋 Key Insights
How Do Mississippi’s Export Credits Affect Solar Savings?
Solar you use as it is produced saves the full retail rate, but power you export earns much less. That gap is the main reason Mississippi solar pays back slowly.
Under the Public Service Commission’s Net Renewable Generation rules, which apply to Entergy Mississippi and Mississippi Power customers, exported energy is credited at the utility’s avoided cost plus an adder rather than netted one-for-one against your usage. A January 2025 PSC order set Entergy Mississippi’s export value at 5.5 cents per kWh, or 7.5 cents for customers eligible for the low-to-moderate-income adder. Credits roll over month to month. Electric cooperatives and TVA distributors are outside those rules and set their own terms, so check with yours.
Data visualization
A solar kWh is worth 5.5 to 14 cents in Mississippi. Retail is about 14.0 cents, the model blend is 7.7 cents, and the Entergy Mississippi export credit is 5.5 cents per kWh. Source: EIA, Mississippi PSC order Jan 2025.
Chart summary: A kWh used at home is worth about 14¢, a kWh exported to Entergy Mississippi about 5.5¢. Our model blends the two into 7.7¢ per solar kWh (14¢ × 0.55), which is why self-consumption, not panel count, drives the return.
Our model reflects this with a bill-offset factor of 0.55: a right-sized system removes about 55% of the retail value of its output from your bill in year one. That factor is an assumption, not a measured statewide figure; your actual value depends on how much solar you use as it is produced. Fixed monthly charges also stay on the bill however much you generate, and fuel adjustments change rates over time.
Before signing, ask your utility in writing:
What export credit applies to your tariff today?
Are there monthly fees specific to customers with solar?
How Long Does Solar Take to Pay Back in Mississippi?
About 27 years on a simple basis, or about 21 years once rising utility rates are counted, for a 9 kW system bought for $27,000 and saving roughly $996 in year one. Simple payback divides cost by year-one savings; break-even counts rate growth and panel degradation.
Source: GreenEnergyCalc standard model; see methodology. Rate growth and the offset factor are assumptions; actual rates may rise faster or slower.
Scenario
Net cost
Simple payback
Break-even with rate growth
25-year net savings
Installed by Dec 31, 2025 with 30% §25D credit (historical)
$18,900
~19.0 years
~15.7 years
~$15,000
2026 at $2.31/W (EnergySage Mississippi average)
$20,790
~20.9 years
~17.0 years
~$13,200
2026 at $3.00/W (model)
$27,000
~27.1 years
~21.0 years
~$6,900
2026 at $3.50/W
$31,500
~31.6 years
~23.6 years
~$2,400
Same production, rate and offset inputs as above. The 2025 row is no longer available for new installs. Price points are illustrative; get several local quotes.
Data visualization
At $3.00 per watt a 9 kW Mississippi system nets about $6,900 over 25 years. Cumulative savings minus installed cost, assuming 3% yearly rate growth and 0.5% yearly degradation, with no federal credit for 2026 installs. Source: GreenEnergyCalc model using EIA rates and NREL sun data.
Chart summary: Each line starts at the negative installed cost and climbs by the year’s bill savings. At $3.00/W the line crosses zero around year 21 and ends near +$6,900 at year 25; at $3.50/W it crosses around year 24 and ends near +$2,400; at $2.31/W it crosses around year 17. The historical 30% credit would have cut break-even to about 16 years.
Panels typically degrade about 0.5% a year, so a system keeps producing, and saving, past year 25. How much of your solar output you use directly matters most:
Data visualization
Simple payback ranges from about 20 to 33 years depending on how much solar you use directly. Cost of $27,000 divided by 12,930 kWh at 14.0 cents times the offset factor. Source: GreenEnergyCalc model using EIA rates.
Chart summary: At the same $27,000 price, simple payback is about 33 years if you capture 45% of retail value, 27 years at 55%, 23 years at 65% and 20 years at 75%. Daytime-heavy households land toward the faster end.
Financing makes the case harder: a $27,000 loan at 7% costs about $278 a month over 12 years (about $209 over 20 years), against year-one savings of about $83 a month. A lease or PPA only helps if the contract price is clearly below retail with a modest escalator. States with higher rates, such as Texas or Florida, pay back faster; neighbors like Louisiana and Alabama face long paybacks too. Compare them in our payback period by state guide.
🏛️ Incentives
Is There Still a Federal Solar Tax Credit in Mississippi in 2026?
No, not for a homeowner who buys a system installed in 2026. The Residential Clean Energy Credit (§25D), which paid 30% of system cost, ended for expenditures made after Dec 31, 2025, and an expenditure counts as “made” when installation is complete. The One Big Beautiful Bill Act (Public Law 119-21, signed July 4, 2025) ended it, as explained in the IRS FAQs on the OBBB changes.
Who can still benefit:
2025 installations: if your system was completed by Dec 31, 2025, claim the credit on your 2025 return using Form 5695. See our Form 5695 guide.
Carryforwards: unused §25D credit from earlier years can still carry forward.
Leases and PPAs: the company that owns the system may still claim the business credit (§48E) if the project began construction by July 4, 2026, or is placed in service by Dec 31, 2027. Any value reaches you only through the contract price; no discount is guaranteed.
Farms and businesses: business-owned solar can use §48E on the same deadlines, plus 5-year MACRS depreciation. Farms and rural small businesses can also apply for USDA REAP grants when funding rounds open.
Nonprofits, churches, schools and local governments: these can use elective (“direct”) pay under §6417 for §48E on qualifying projects within the same deadlines.
At the state level, Mississippi has no solar income-tax credit. The PSC has ordered utility programs for Entergy Mississippi and Mississippi Power customers, including income-based adders, a battery incentive and Solar for Schools; the commission suspended some of them in 2024 and lifted that stay in April 2025, so confirm what is open today with your utility and DSIRE. The §25C efficiency credit also ended after 2025; state-run IRA Home Energy Rebates were not repealed, but availability depends on Mississippi’s program launch and remaining funds. See our federal solar tax credit guide. This is general information, not tax advice; confirm your situation with a tax professional.
⚡ System Size
How Should You Size a Solar System in Mississippi?
Size to the power you use while the sun is shining, not to your total annual kWh. Because exports earn well below retail, every kWh you use on site is worth far more than one you send to the grid.
At 4.8 peak sun hours and a 0.82 derate, each installed kW produces about 1,437 kWh a year in our model. A household using 12,000 kWh a year would need about 8.4 kW to match annual use (12,000 ÷ 1,437), but if much of that use happens in the evening, a smaller system matched to daytime load can deliver a better return per dollar. PSC rules also cap residential systems at the lesser of 20 kW or 110% of annual peak demand.
Daytime loads help. Summer air conditioning lines up well with solar output; home offices, pool pumps and daytime EV charging raise self-consumption.
Evening loads don’t. Cooking, lighting and evening cooling draw from the grid after production drops.
Ask for interval data. A good installer reviews 12 months of hourly or 15-minute usage before recommending a size.
If an installer sizes your system from monthly totals alone, or proposes 110–120% of annual usage, ask why; in Mississippi that design mostly adds low-value exports. Start with the solar system size calculator, and see how much solar panels cost in 2026 for price context.
🔋 Storage & Usage
When Does Battery Storage Make Sense in Mississippi?
Mainly when backup power is the goal. Home batteries are typically a five-figure purchase, homeowner-owned batteries installed in 2026 get no federal credit, and Mississippi utilities offer little time-of-use pricing that would reward shifting stored solar to the evening.
Storing midday solar for evening use does avoid exporting at 5.5 cents and buying back at about 14, but that gap is small per kWh and does not repay a battery on bill savings alone.
Resilience is different. Hurricanes affect the Gulf Coast counties and ice storms reach the northern part of the state, and extended outages carry real costs, especially for households with medical equipment, young children or home businesses. A battery sized for essentials (refrigerator, lights, some HVAC, a well pump) can carry a home through a day or two without grid power. Standard grid-tied solar shuts off during an outage, so backup requires a battery or an islanding-capable system.
Before buying, size storage to your critical loads with the battery storage calculator, and model backup value with the Tesla Powerwall ROI calculator. For a neighboring state with similar rules, see our guide to solar panels in Louisiana.
Not for homeowners who buy a system installed in 2026. The 30% Residential Clean Energy Credit (§25D) ended for expenditures made after Dec 31, 2025, under Public Law 119-21, and an expenditure counts as made when installation is complete. Systems finished in 2025 are claimed on the 2025 return with Form 5695, and unused credit from earlier years can still carry forward. Leases, PPAs, farms and businesses follow different rules.
For bill savings alone it is marginal. Our model, a 9 kW system at $27,000, shows a simple payback of about 27 years, about 21 years once 3% annual rate growth is included, and roughly $6,900 of net savings over 25 years. It improves with a lower quote (about $2.31 per watt gives roughly $13,200), heavy daytime use, or rising rates, and it weakens if you export most of your output.
Mississippi uses Net Renewable Generation rules, not one-for-one net metering. Power you use as it is produced offsets the retail rate, while exports to Entergy Mississippi or Mississippi Power are credited at the utility's avoided cost plus an adder. A January 2025 PSC order set Entergy Mississippi's export value at 5.5 cents per kWh (7.5 cents for low-to-moderate-income customers), against roughly 14 cents retail. Electric cooperatives and TVA distributors set their own terms.
Published Mississippi averages run from about $2.31 per watt (EnergySage, July 2026) to higher figures from other trackers, so a 9 kW system lands between roughly $21,000 and $31,500 before incentives. We model $3.00 per watt, or $27,000, because full-market installed costs run above marketplace averages. With no federal credit in 2026, the sticker price is the net price.
Mississippi has no state solar income-tax credit. The Public Service Commission has ordered utility-run options for Entergy Mississippi and Mississippi Power customers, including income-based export adders, a battery incentive and Solar for Schools; it suspended some of them in 2024 and lifted that stay in April 2025, so confirm current availability with your utility. Farms and rural small businesses can seek USDA REAP grants, and business-owned systems can still use §48E and MACRS depreciation.
15.19¢/kWh — Mississippi 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
5.2 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
No statewide net metering — utility-dependent — solar assumed to offset 55% of the bill. Mississippi's net-renewable rules credit exports well below retail for most customers.
Estimates only — not tax, legal or financial advice. Get at least three installer quotes and confirm incentives with your utility and a tax professional.