Sunwise Energy installs residential and commercial solar across New Castle County, serving Wilmington, Newark, Middletown, Bear, Hockessin, Pike Creek, and communities throughout Delaware’s most populated county. Delmarva Power serves the county, and rates are climbing, with another 7 percent supply increase expected in June 2026. Delaware’s Green Energy rebate, SRECs, full retail net metering, and zero state sales tax make New Castle County one of the strongest solar markets in the tri-state area.
| Detail | Value |
|---|---|
| Utility | Delmarva Power |
| Rate Trend | Rising: 3rd base rate increase in 5 years, ~7% supply increase expected June 2026 |
| DE Incentive 1 | Green Energy Program rebate ($0.70/watt, up to $6,000) |
| DE Incentive 2 | SRECs (~$30/credit years 1-10, ~$10/credit years 11-25) |
| Net Metering | Full retail rate with annual payout option (Delmarva Power) |
| Sales Tax | Zero state sales tax (DE has no sales tax) |
| Property Tax | No statewide solar property tax exemption in DE |
| Equipment | Premium panels + microinverters |
| Permitting | New Castle County Dept. of Land Use (county) or municipal (Wilmington, Newark, Middletown) |
| Installer | Sunwise Energy, in-house crews, licensed in DE/PA/NJ |
Residential, commercial, and battery storage for Delaware’s largest county.
New Castle County’s housing ranges from Wilmington rowhomes to suburban colonials in Hockessin and newer construction in Middletown. Delmarva Power customers can offset most or all of their utility bill with a properly sized system using premium panels and microinverters.
New Castle County is Delaware’s commercial hub, with corporate offices along the I-95 corridor, the Christiana area, and Wilmington’s business district. Business owners can take advantage of the federal Investment Tax Credit (available through July 4, 2026), accelerated depreciation, Delaware SRECs, and Delmarva net metering.
Pairing solar with a battery keeps your home running during Delmarva outages and maximizes every kilowatt-hour your system produces. If your roof needs work first, Sunwise bundles roofing and solar into a single project.
Delmarva Power serves New Castle County, and residential electricity costs have been climbing steadily. Delaware’s solar incentive stack makes the case even stronger: the Green Energy Program provides Delmarva customers up to $6,000 in rebates, SRECs pay approximately $30 per credit for the first 10 years, net metering credits excess production at the full retail rate with an annual payout option for surplus, and Delaware has no state sales tax on solar equipment. Unlike neighboring Pennsylvania, which charges 6% sales tax on solar equipment and offers no property tax exemption, Delaware’s zero sales tax lowers the upfront cost from day one. For business owners, the federal Investment Tax Credit remains available through July 4, 2026.
A Sunwise Energy Specialist reviews your Delmarva Power billing history, roof condition, and sun exposure to design a system sized to your actual consumption.
We create a custom system design and handle all permitting through New Castle County’s Department of Land Use or your municipality’s construction office.
Our in-house crews complete residential systems in less than a day using premium panels and microinverters, handling all electrical work, racking, and wiring to meet Delaware code.
Sunwise coordinates your Delmarva Power interconnection and meter swap. Once Delmarva grants Permission to Operate, your system goes live, producing power, earning net metering credits, and generating SRECs.
During your visit, a Sunwise Energy Specialist will:
A consultation is free, pressure-free, and designed to help you understand whether solar truly makes sense for your home.
Sunwise Energy installs solar throughout New Castle County, from Wilmington and the I-95 corridor suburbs to the fast-growing communities south of the C&D Canal. Our Cherry Hill headquarters is approximately 30 minutes from most of the county, and our crews install across the Delaware Valley daily.
Delaware's largest city and the county seat, with a mix of rowhomes, historic neighborhoods, and a significant commercial and institutional presence. Wilmington's compact urban housing benefits from high-efficiency panel layouts, and the city's commercial buildings offer strong flat-roof solar opportunity.
Home to the University of Delaware, Newark features a mix of residential neighborhoods, student housing, and commercial corridors. Single-family homes in the surrounding areas of Bear, Glasgow, and Christiana offer excellent solar conditions with minimal shading.
One of Delaware's fastest-growing areas, with newer residential construction, larger lots, and excellent south-facing roof exposure. The Appoquinimink corridor's new developments are among the best candidates for residential solar in the county.
Affluent communities in the northern part of the county with larger homes, higher energy consumption, and strong solar economics. Mature tree canopy in some areas requires shade analysis, but homes that clear the assessment support larger systems with fast payback.
Established suburban communities with mid-century and newer housing stock. Ranch-style homes and colonials with open roof planes are well suited for standard residential solar installations.
Growing communities along the Route 40 and Route 7 corridors with a mix of suburban developments, commercial centers, and newer construction. Both residential and commercial solar opportunities are strong in this part of the county.
Historic communities along the Delaware River with a mix of older housing stock and waterfront properties. Solar is viable on most homes here, and Sunwise designs systems for varying roof conditions and orientations.
Bordering Pennsylvania, these communities feature a mix of older single-family homes and townhouses close to I-95 and the Pennsylvania state line. Proximity to our Cherry Hill office means fast response times and convenient service.
We also provide solar installation throughout Delaware.
The cost of a solar system in New Castle County depends on your home’s energy usage, roof size, layout, and complexity, so there is no single price. Delaware’s incentive stack significantly reduces the effective cost: the Green Energy Program rebate provides up to $6,000, SRECs generate ongoing income, net metering credits excess production at the full retail rate, and Delaware charges zero state sales tax on solar equipment. $0-down financing options make solar accessible without upfront investment. Commercial property owners can also take advantage of the federal Investment Tax Credit through July 4, 2026. The best way to get an accurate number is to schedule a free consultation with a Sunwise Energy Specialist.
Yes, Delmarva Power provides full retail-rate net metering for all residential and commercial solar customers throughout New Castle County, with an annual payout option for surplus credits. Excess energy your system produces is credited at the full retail rate on your Delmarva bill. Credits roll forward month to month, and at the end of a 12-month period you can elect to receive a payout for any remaining surplus at the full retail rate.
New Castle County homeowners can access four key Delaware solar incentives: the Green Energy Program rebate ($0.70/watt, up to $6,000), SRECs (~$30/credit for years 1-10, ~$10/credit for years 11-25), full retail net metering with annual payout option, and zero state sales tax on all purchases. Unlike neighboring Pennsylvania, Delaware charges zero sales tax on solar equipment, which lowers the upfront cost. Delaware does not have a statewide property tax exemption for solar. The federal residential tax credit is no longer available to homeowners. Business owners can claim the federal Investment Tax Credit (Section 48E) through July 4, 2026.
Most residential solar permits in New Castle County are handled through the county’s Department of Land Use, while incorporated municipalities like Wilmington, Newark, and Middletown manage their own permitting processes. Solar installations require building and electrical permits. Sunwise handles all permit applications, inspections, and coordination with local building departments on your behalf.
Yes, Delmarva Power has filed for its third base rate increase in five years, with a roughly 7 percent supply cost increase expected in June 2026 that will add approximately $11 per month to the average residential bill. These increases are on top of rising PJM capacity costs that have already pushed bills higher. Solar locks in a fixed energy cost and shields you from continued rate increases.
Yes, Sunwise Energy is licensed for solar installation in Delaware, Pennsylvania, and New Jersey, with Cherry Hill headquarters approximately 30 minutes from most of New Castle County. Our crews install across the tri-state area daily. We handle all Delaware-specific permitting, Delmarva Power interconnection, Green Energy Program rebate applications, and SREC registration on your behalf.
Schedule a free consultation with a Sunwise Energy Specialist. We’ll assess your home, design a custom system, and walk you through your savings with a dedicated in-house team from start to finish.
$0-down financing, loan, and lease options available. NJ's SuSI program ($85/MWh for 15 years), property tax exemption, and sales tax exemption make going solar more affordable than ever.
