Solar resource
Your solar production in Louisville
4.69 avg peak sun hours/day
Monthly avg solar radiation (kWh/m²/day) — Louisville, KY. Bars update to show estimated kWh production when you use the calculator above.
Utility rate
LG&E (Louisville Gas and Electric) electricity rate
$0.114/kWh residential
- Utility
- LG&E (Louisville Gas and Electric)
- Residential rate
- $0.114/kWh (blended)
LG&E served Louisville under Kentucky’s net-metering framework, which offered 1:1 retail-rate credit for exported solar through 2024 for customers already enrolled. Kentucky’s PSC has since ordered utilities including LG&E to reduce net-metering credit rates for new enrollments beginning in 2025, moving toward an avoided-cost or reduced-credit structure. New solar customers in Louisville should confirm the current LG&E net-metering tariff before sizing a system for large exports.
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Incentives
Available solar incentives in Louisville, KY
Federal + state + utility
| Incentive | Type | Value | Scope |
|---|---|---|---|
| Federal Solar Investment Tax Credit (ITC) | Tax Credit | 30% of system cost | Federal |
| LG&E Net Metering (transitional) | Net Metering | 1:1 retail-rate credit for grandfathered customers; reduced rate for new 2025+ enrollments | Utility |
| Kentucky — no major state residential solar incentive | Exemption | No broad statewide residential solar tax credit or rebate | State |
Incentive amounts and eligibility rules change. Verify current terms with your installer and a tax professional before installation.
System cost
Cost breakdown (6 kW default)
- Gross system cost
- $22240
- Federal ITC (30%)
- −$6672
- Net system cost
- $15,568
- Installed cost per watt
- $2.78/W
Midwest/Upper-South benchmark estimate for an 8 kW residential system in the Louisville market.
Payback & long-term value
25-year outlook
- Annual savings (yr 1)
- $1,221
- Simple payback period
- 12.7 years
- 25-year net savings
- $39000
- Assumed annual rate increase
- 2.5%/year
25-year estimate uses flat electricity rate for conservative baseline. Accounting for 2.5% annual rate increases, lifetime savings increase substantially.
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How it works
How solar savings work in Louisville
- Your panels capture Ohio Valley sun NREL PVWatts modeling for Louisville shows about 4.69 peak sun hours per day and roughly 10,719 kWh per year from a standard 8 kW roof-mount system.
- Self-consumption delivers the strongest savings On-site consumption offsets LG&E purchases at the retail rate, which is the highest-value solar use given that export credit rates have been reduced for new enrollments.
- Kentucky’s net-metering transition changes the export equation Kentucky moved away from full 1:1 retail net metering for new solar customers after 2024. New LG&E enrollments receive reduced export credit, which means oversizing for large exports is less economically attractive than in the legacy net-metering era.
- No major Kentucky state solar incentive Kentucky does not offer a significant statewide residential solar tax credit. The federal ITC is the primary upfront incentive for Louisville homeowners.
- The federal ITC lowers the installed cost On a modeled $22,240 installed cost, the 30%% federal ITC is worth about $6,672, bringing net upfront cost to roughly $15,568 before financing effects.
- Long-run savings still build as LG&E rates rise Even with reduced export economics, a well-sized Louisville system creates durable savings over time as LG&E bills escalate. The key is sizing to match your actual usage.
FAQ
Common solar savings questions for Louisville, KY
How much can I save with solar in Louisville, KY?
An 8 kW system in Louisville is modeled at about 10,719 kWh/year. At an effective LG&E bill-impact rate of roughly $0.114/kWh, first-year savings are around $1,221 and simple payback is about 12.7 years after the federal tax credit.
Does Kentucky still offer net metering for Louisville homeowners?
Kentucky changed its net-metering policy for new enrollments after 2024. LG&E now offers reduced export credit rather than full 1:1 retail rates for new solar customers. Customers enrolled before the change retain grandfathered terms for a transition period.
Does Kentucky offer a state solar tax credit?
No. Kentucky does not have a major statewide residential solar tax credit or rebate. The federal ITC is the primary upfront incentive for Louisville solar installations.
Is solar still worth it in Louisville after the net-metering change?
Yes, but system sizing matters more. Solar still works in Louisville because on-site consumption offsets real LG&E purchases. The key is not to oversize for exports that are now compensated at reduced rates.
How many solar panels does a Louisville home need?
Many Louisville homes land in the 6–9 kW range depending on annual usage and roof space. Given the reduced export credit, matching system size to household consumption is the most important design decision.
Does Ohio River flooding affect solar panel installation in Louisville?
The Ohio River floodplain overlay primarily affects deck and structure permitting rather than rooftop solar directly, but flood-hazard zone designation can affect property assessments and insurance that may interact with solar financing.
Do I need a permit for solar in Louisville?
Yes. Rooftop solar requires local permitting and LG&E interconnection approval. If you are also building a deck, review the Louisville deck permit page so both scopes stay coordinated.
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Disclaimer: This calculator provides estimates for informational purposes only — not financial or investment advice. Solar savings depend on actual shading, roof orientation, energy usage patterns, rate changes, and equipment performance. Consult a licensed installer and a tax professional before making purchasing decisions. Verify incentive eligibility with official sources. Data last verified 2026-04-19.