The Future of Solar and Battery Storage in Tennessee
Home solar in Tennessee is headed one direction: make your own power, use it at home and store the rest for when the grid goes down. TVA territory has no 1-for-1 net metering, the 30% federal homeowner tax credit ended for systems installed after December 31, 2025, and Winter Storm Fern left about 230,000 NES customers without power in January 2026. For Nashville homes, that puts three things at the top of the list: a battery, an array sized to your own usage, and a roof that will outlast the panels.
TVA and NES Programs
TVA and NES Solar Programs: Size for Self-Use, Not Export
Tennessee is TVA territory, and there is no traditional 1-for-1 net metering here. TVA retired its old Green Power Providers buyback, so the grid no longer pays retail price for every extra kilowatt-hour you send back.
NES runs two limited programs. NESolar Savings covers arrays smaller than 250 kW and buys eligible excess energy when the array averages a monthly surplus of at least 50 kWh. NESolar Connect, where NES buys 100% of a system's output, is for systems larger than 200 kW. Both come with specific terms and caps. If you are on Middle Tennessee Electric, which serves Rutherford, Williamson, Wilson and Cannon counties, we check MTE's current interconnection terms during your assessment.
The takeaway: size solar for self-consumption, not export. The average Nashville home uses about 1,075 kWh a month, roughly $134 at about 12 cents per kWh. A 10 kW array here makes roughly 13,500 to 14,500 kWh a year on about 4.8 peak sun hours a day. We size the array to your last 12 months of usage, so the power you make is power you use.
Why Batteries Matter After Winter Storm Fern
Winter Storm Fern hit Middle Tennessee in January 2026. NES outages peaked at about 230,000 customers, roughly half of all NES customers, and it took about 13 days for NES to restore nearly all power. A standard grid-tied solar array shuts off when the grid goes down. A battery is what keeps your house running.
One Tesla Powerwall 3 stores 13.5 kWh and typically covers essential loads, like the fridge, freezer, lights, Wi-Fi and a gas furnace blower or small mini-split, for roughly 12 to 24 hours, longer when solar recharges it during the day. A Powerwall 3 runs about $15,400 installed. Enphase IQ Batteries run $12,000 – $18,000 installed in 5 or 10 kWh units.
Fern was not a one-off. The Nashville area sees roughly 5 to 7 outage-causing severe weather events a year, from spring storms to summer heat and ice. And with TVA-area buyback programs limited, a battery lets you use your own midday solar after dark instead of sending it back to the grid. That makes a battery worth pricing into any Nashville solar plan.
Where Tennessee Solar Is Headed
What Changed for Tennessee Solar in 2025 and 2026
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Tax credits, power rates, roofs and new panel technology
Federal tax credit
The 30% Homeowner Credit Is Gone
The 25D residential clean energy credit ended for homeowner-owned systems installed after December 31, 2025, under the One Big Beautiful Bill Act signed July 4, 2025. Solar here now pencils out on your power bill, not a tax refund. Leases and PPAs, where a third party owns the system, may still carry the business 48E credit through 2027. Confirm your situation with a tax professional.
Power rates
Rates Keep Climbing
TVA raised its wholesale base rate 5.25% on October 1, 2024, and NES passed it through, adding about $3.78 a month to the average home bill (WSMV, September 30, 2024). Every kilowatt-hour your panels make and you use at home is one you do not buy at the new rate.
Your roof
Your Roof Has to Outlast the Array
Solar is a 25-year investment, so never put it on a roof with only a few years left. Pulling and reinstalling an array for a later re-roof typically costs $3,000 – $6,000. On standing seam metal, panels attach to the seams with S-5! style clamps and no roof penetrations. A shingle roof needs flashed, lagged mounts, often 40 to 80 penetrations on a typical array. Doing roof and solar as one project typically saves $2,000 – $5,000.
New panel tech
Perovskite Panels Are Not Roof-Ready Yet
Perovskite solar cells convert sunlight efficiently, but researchers at NREL and Sandia National Laboratories say durability is still the open question, with very little long-term outdoor data so far (NREL, 2025). For a Nashville roof today, proven silicon panels backed by long manufacturer warranties are the right call. We will keep watching.
Learning Center
Nashville Solar and Battery Guides
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Straight Answers
Tennessee Solar and Battery Questions for 2026
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Is solar still worth it in Tennessee without the 30% tax credit?
It can be, if the system is sized to your own usage and your roof is ready. The homeowner credit ended for systems installed after December 31, 2025, so the payback now comes from the power you make and use at home. Residential solar runs $2.85 – $3.50 per watt installed, and a typical 8 to 14 kW home system runs $22,800 – $49,000.
Does NES buy back extra solar power?
Only in limited ways. NESolar Savings buys eligible excess energy from arrays smaller than 250 kW that average at least 50 kWh of monthly surplus, and NESolar Connect buys 100% of the output on systems larger than 200 kW. There is no 1-for-1 net metering in TVA territory, so we size systems for self-consumption.
Will my solar panels work during a power outage?
Not without a battery. A grid-tied array shuts off when the grid goes down. One Tesla Powerwall 3 stores 13.5 kWh and typically runs essential loads for roughly 12 to 24 hours, longer when solar recharges it. After Winter Storm Fern, when NES took about 13 days to restore nearly all power, that is the difference that matters.
Should I replace my roof before going solar?
If your roof has only a few years left, yes. Pulling and reinstalling an array later typically costs $3,000 – $6,000, while doing roof and solar together typically saves $2,000 – $5,000. Standing seam metal is the best match, since panels clamp to the seams with no roof penetrations.
✦ Reviewed by The Solar Roofers Technical Team
Written and reviewed by the team that designs and installs our solar and battery systems, roofing Middle Tennessee since 2003. Licensed and insured · BBB A+ · Tesla Powerwall Certified Installer · TVA EnergyRight Preferred Partners Network · Reviewed October 2026
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More Answers from The Solar Roofers Learning Center
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What happens to solar power you do not use in Tennessee?
The answer comes from your electric provider and signed agreement, not your city name. A self-use system, an approved excess-energy purchase program and a sell-all contract produce different bills. Do not assume every exported kilowatt-hour earns a credit, or that a credit equals the retail price of electricity.
Source check: October 29, 2026. These are planning notes, not utility approval or a binding rate quote. Confirm the account, meter, tariff and effective month before signing a proposal.
| Provider and pathway | What to verify | Primary source |
|---|---|---|
| Nashville Electric Service: NESolar Savings | Eligible surplus purchases rather than retail-rate net metering. The published guidelines specify a maximum 250 kW DC array and at least 50 kWh average monthly excess; the marketing summary uses “smaller than 250 kW.” Ask NES to resolve boundary eligibility in writing. Purchases are also limited relative to the participant’s annual consumption. | NES guidelines, Savings eligibility, pages 7–8 |
| NESolar Connect | A separate full-output purchase arrangement. NES describes it for larger systems above 200 kW. Model the building’s purchased electricity separately from generation revenue; do not count the same generation as both avoided purchases and sold output. | NESolar program overview and application |
| Middle Tennessee Electric | MTE describes TVA Dispersed Power Production as a possible route for qualified excess generation. Its FAQ gives an approximate price, not a guaranteed future tariff, and warns that additional hardware, construction and contract time may be needed. | MTE solar FAQ: selling power |
| Dickson Electric System | DES distinguishes unpaid surplus self-generation, excess sales under DPP, and sell-all generation. The required meter configuration differs. Its page lists a $50 Green Connect application fee and a $100 application route elsewhere; obtain the applicable fee in writing. DPP reporting also carries a monthly fee to confirm directly. | DES connection options, metering and fees |
| Cumberland Electric Membership Corporation | CEMC directs prospective generators to its Energy Consultant and TVA renewable programs. Obtain the site-specific interconnection packet, export terms, meter requirements and fee schedule. Do not substitute the rules of another cooperative with a similar name. | Cumberland EMC energy solutions |
Why we do not print one permanent “Tennessee solar buyback rate”
The NES Savings agreement adjusts its purchase price to include TVA’s monthly Standard Service Fuel Cost Adjustment. Read the applicable monthly schedule with the agreement. A seasonal base component by itself is not the final export price. NES Savings agreement, sections 4–5.
NES’s public rates page retrieved October 29 still displayed a September fuel adjustment. That is a reason to request the rate for your billing month, not to relabel September as October. Fixed service and grid-access charges also matter. NES rates and dated schedules.
The eight documents a solar proposal should reconcile
- Your last 12 bills and, when available, interval usage from the serving utility.
- The exact retail tariff, current adjustment and fixed-charge calculation.
- The current generation application and its version date.
- The proposed electrical one-line diagram, array DC rating and inverter AC rating.
- Written interconnection requirements, meter changes, protection settings and upgrade costs.
- The export purchase agreement, if any, including fees, term and termination rules.
- The purchase-price schedule and ownership of renewable energy certificates.
- Final inspections, commissioning record and utility permission to operate.
Read a bill in four separate buckets
For a self-use system, start with grid energy imported × the applicable import rate. Add fixed charges and applicable demand charges, then subtract only approved export credits. Keep solar loan payments and maintenance outside the utility subtotal so the complete household budget remains visible. For a sell-all project, calculate consumption charges and generation revenue separately.
An illustrative month with 900 kWh consumption, 800 kWh solar production and 450 kWh simultaneous self-use has 450 kWh imports and 350 kWh exports. At invented teaching rates of $0.12/imported kWh, $0.03/exported kWh and $25 fixed charges, the bill is $54 + $25 − $10.50 = $68.50. Without solar it would be $133. These are arithmetic assumptions, not NES, MTE, CEMC or DES rate quotes; financing, taxes, demand charges and other fees are excluded.
Questions to ask before choosing a larger array
- How much additional production will I use at the same time it is generated?
- What happens to surplus if my purchase-program application is declined or delayed?
- Does a battery improve the budget after losses, reserve requirements and its own cost?
- Does a change of owner, account or system size require a new agreement?
Continue with our bill-offset calculations and financing comparison.
