Solar Panel Installation in New Castle, DE
Local sun, utility rules, permits and installers
New Castle has about 1,190 kWh a year per kW of rooftop solar (our estimate). Your utility decides what exported power earns, so see the rules for Delmarva Power below, then get quotes.
New Castle solar at a glance
Utility rules and programs for New Castle
Delmarva Power serves homes in New Castle.
| Utility | Type | Solar export rule |
|---|---|---|
| Delmarva Power | investor-owned | Under state law, Delmarva credits extra solar power on your later bills at the per-kWh supply and delivery charges (not the fixed monthly charge or societal-benefits charges), and unused credit carries over between yearly periods. Residential systems can be up to 25 kW and no standby fee is allowed. You apply to Delmarva for interconnection before you install; we could not read its application pages. |
Program details are from each utility’s own pages (read October 2026). See the Delaware incentives table for statewide credits and a status for every program.
Permits and approvals in New Castle
- New Castle County Land Use (county page; check City of New Castle for city rules): permit information
- This is the county’s page, not the city’s own. The county says it does not permit or inspect electrical work: State-licensed electricians must have work inspected by a licensed inspection agency.
- The utility must approve the connection before you switch on: Delmarva Power solar and wind page (Delaware) · your own utility’s interconnection page.
- Check any contractor on the Delaware DELPROS license lookup (electricians) before you sign.
- We found no Delaware statute that protects your right to install solar against an HOA (the Delaware Uniform Common Interest Ownership Act, 25 Del. C. chapter 81, does not mention solar), so your deed restrictions and HOA rules apply; get written approval before you sign (not confirmed).
Fees and steps change; confirm with the office before you start. We have not verified timelines for New Castle.
Costs and savings
We do not have verified installed prices for New Castle alone. The Delaware figures above show what to expect; real quotes depend on your home, equipment and installer. Try the solar savings calculator, and get at least two written quotes.
Choosing an installer
- License: check the contractor on the Delaware DELPROS license lookup (electricians) and that the license covers this work.
- Quote: ask for an itemized written quote that names the equipment, warranties and who pulls the permit and handles the utility approval.
- Compare: get two or three quotes and compare them line by line, not only the total.
Get solar quotes in New Castle
Tell us about your project in New Castle. We reply ourselves and match you with a licensed installer who serves your area. It is free, with no obligation, and nothing is shared with an installer unless you choose one.
More for New Castle
Home Battery Installation in New Castle · Backup Generator Installation in New Castle · Home EV Charger Installation in New Castle · New Castle energy guide · Delaware energy guide.
Solar Panel Installation in New Castle FAQs
Is solar worth it in New Castle?
The sun is strong (about 1,190 kWh a year per kW, our estimate), but export credits are low, so solar pays most when sized to what you use at home or paired with a battery. See the Delaware incentives for the state credit.
Is there a federal solar tax credit in 2026?
No. The federal 25D credit ended for expenditures after December 31, 2025. Delaware has no state solar tax credit that we could confirm; the state’s help is a grant of up to $10,000 for Delmarva Power customers and loans through Energize Delaware.
Do I need a permit for solar panels in New Castle?
Usually yes, and the utility may need to approve solar and batteries. New Castle County Land Use (county page; check City of New Castle for city rules) handles permits in New Castle; see the permit information above.
How do I find a licensed installer in New Castle?
Use the quote button on this page. We reply ourselves and match you with a licensed installer who serves your area; you can check any contractor on the Delaware DELPROS license lookup (electricians).
Sources: sunshine and climate NASA POWER; hazards FEMA National Risk Index; utility numbers EIA-861 (2024); prices EnergySage (October 2026) and Generac (U.S.); credits IRS and the Delaware Division of Revenue; permit information from the city or town’s own page; utility programs from each utility’s own pages (October 2026). General information, not financial, tax, legal or electrical advice. See our editorial policy.