Solar in New Castle: What Homeowners Should Know
New Castle sees an average of 4.3 peak sun hours per day, which is what ultimately determines how much electricity a rooftop system produces here. A standard 8 kW system (about 20 panels) generates roughly 10,045 kWh each year in New Castle — and paired with Delaware's local electricity rate of $0.139/kWh, that's where the savings come from.
At those numbers, a New Castle homeowner saves about $116/month ($1,396/year). Against a $24,800 system cost (about $23,800 after Delaware state incentives), that works out to a payback of about 17 years, after which the system produces essentially free power for two decades — an estimated $23,892 in lifetime savings. Note: the 30% federal tax credit expired at the end of 2025 for purchased systems, though a solar lease or PPA can still pass it through. The local grid is served by Delmarva Power, whose net metering policy directly affects how much credit you earn for surplus power.
Cost & Savings Breakdown
Based on a standard 8 kW system in New Castle
25-Year Savings Projection
Utility & Net Metering
Available Incentives
Choosing a Solar Installer in New Castle
- 1.Get at least 3 quotes. Prices in Delaware vary widely between installers — comparing bids on the same 8 kW system is the fastest way to avoid overpaying.
- 2.Confirm Delmarva Power interconnection experience. An installer who regularly files with your local utility will move your permit and net-metering paperwork through faster.
- 3.Check licensing & the warranty. Look for NABCEP-certified installers and a workmanship warranty of 10+ years on top of the standard 25-year panel warranty.
- 4.Size for your actual usage. With 4.3 sun hours/day in New Castle, make sure the proposed system matches your kWh history — not just your roof space.
Common Questions
How much does solar cost in New Castle?
Solar in New Castle, Delaware costs approximately $24,800 for a 8 kW system, or about $23,800 after state incentives. The 30% federal tax credit expired December 31, 2025 for purchased systems, though solar leases and PPAs can still pass it through.
What is the solar payback period in New Castle?
The estimated payback period for solar in New Castle is 17 years for a standard 8 kW system, based on local sun hours of 4.3 hrs/day and a rate of $0.139/kWh.
Is solar worth it in New Castle?
For most New Castle homeowners, yes. With 4.3 peak sun hours per day and an electricity rate of $0.139/kWh, a typical system saves $1,396 per year and around $23,892 over 25 years after paying for itself in 17 years.
How many solar panels do I need in New Castle?
A standard 8 kW home solar system is about 20 panels, producing roughly 10,045 kWh per year in New Castle at 4.3 sun hours/day. Your exact size depends on your household's electricity use.
Does Delmarva Power offer net metering?
Delmarva Power offers Full Retail net metering. Full retail rate.