Solar in Louisville
Louisville sits in the Ohio River Valley with moderate sunshine—about 4.5 peak sun hours daily. Combined with Louisville Gas & Electric's (LG&E) policies and limited state incentives, solar requires realistic expectations.
Louisville Solar Factors
- Moderate sunshine: 4.5 peak sun hours, 185 sunny days
- Low electricity rates: ~$0.11/kWh through LG&E
- LG&E territory: Monopoly utility with set policies
- Limited state incentives: Kentucky has minimal programs
- Four seasons: Winter production drops significantly
LG&E Utility
Louisville Gas & Electric (LG&E) is a regulated utility serving the Louisville metro area. Their net metering program allows solar customers to offset usage.
LG&E Net Metering
- Net metering: Available for residential systems
- Credit rate: Typically at retail rate for monthly credits
- Annual rollover: Check current LG&E policy for year-end credits
- System limit: Residential size limits apply
Average Electricity Costs
- Louisville average: ~$0.11/kWh
- Summer rates: May increase with usage tiers
- Coal transition: LG&E transitioning away from coal
- Rate outlook: Likely gradual increases over time
Incentives & Tax Credits
Federal Tax Credit (2026)
| Ownership Type | Federal Credit | Notes |
|---|---|---|
| Cash/Loan Purchase | None (0%) | 25D residential credit ended Dec 31, 2025 |
| PPA/Lease | 30% (to company) | 48E credit through Dec 31, 2027 |
The solar company claims the credit on leased systems and passes savings to you through lower rates.
Kentucky Incentives
- State tax credit: None currently
- Property tax exemption: Kentucky exempts solar from property tax
- Sales tax: Solar equipment is subject to Kentucky sales tax
- Utility rebates: LG&E occasionally offers programs—check current availability
Costs & Savings
Average System Costs (2026)
| System Size | Gross Cost | Cost Per Watt |
|---|---|---|
| 5 kW | $13,000-15,500 | $2.60-3.10 |
| 7 kW | $18,200-21,700 | $2.60-3.10 |
| 10 kW | $26,000-31,000 | $2.60-3.10 |
No federal tax credit for purchased systems in 2026. Limited Kentucky incentives.
Production & Savings
- Annual production: 1,200-1,350 kWh per kW installed
- 7 kW system output: ~8,500-9,000 kWh/year
- Annual savings: $900-1,100 at $0.11/kWh
- Payback period: 15-18 years (honest assessment)
Seasonal Considerations
- Summer peak: June-August best production months
- Winter drop: December-February significantly lower
- Spring/Fall: Good shoulder season production
- Snow: Occasional accumulation; panels usually self-clear
The Bottom Line
Louisville solar requires patience and realistic expectations. With 15-18 year paybacks, this isn't a get-rich-quick market. But for homeowners planning to stay long-term, solar can still make financial and environmental sense.
Key considerations:
- Moderate sunshine means lower production than Sun Belt
- No federal credit for purchased systems extends payback
- PPA/Lease option keeps 30% credit benefit
- Kentucky property tax exemption helps
- Best for: long-term homeowners, environmental priority
- Consider: Is this your forever home? Solar makes more sense if yes.
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