Washington County splits between two very different utility footprints. Most of the county runs on Potomac Edison, but Hagerstown itself is served by its own municipal power provider. NEDES designs around whichever utility actually reaches your roof, then layers in what Maryland offers heading into 2026: property and sales tax exemptions, an active SREC market, and full retail-rate net metering.
NREL’s PVWatts calculator, using TMY3 data from Hagerstown Regional Airport (a station actually inside the county rather than borrowed from somewhere else in the state), puts Washington County at approximately 4.4 peak sun hours per day annually. Summer months (June–August) climb toward the 5.1–5.4 hour range, while December and January typically drop to around 2.9–3.2 hours.
Most of Washington County is Potomac Edison territory, a FirstEnergy subsidiary whose last full Maryland rate case closed in October 2023, with current residential rates running roughly 11–12 cents per kWh. Hagerstown itself, though, runs its own municipal utility (the City of Hagerstown Light Department) separate from Potomac Edison entirely. That means two Washington County addresses a few miles apart can be billed by completely different providers with different rate structures and different interconnection processes. We confirm which utility actually serves your property before we design anything, since getting this wrong changes the entire quote.
The federal Residential Clean Energy Credit under Section 25D expired for any system placed in service after December 31, 2025, terminated by the One Big Beautiful Bill Act (Public Law 119-21, signed July 4, 2025). A Washington County homeowner buying with cash or a loan in 2026 receives no federal tax credit on that purchase. NEDES offers cash, loan, and lease/PPA financing for Washington County homeowners, and a lease or PPA remains the one path that still reaches the 30% figure, through the system owner’s commercial Section 48E claim rather than a direct homeowner deduction.
Maryland Tax-Property Code § 7-242 classifies solar energy property as exempt from local real property tax assessment. A system that would otherwise add real value to your home’s assessment adds $0 to your annual Washington County property tax bill, and the exemption doesn’t expire under current Maryland law.
Maryland exempts qualifying solar energy equipment from the state’s 6% sales and use tax. On a $26,000 system (roughly the state average for a 9 kW installation in 2026 at about $2.90 per watt before incentives), that exemption is worth close to $1,560 in savings you never see on the invoice.
Every Washington County solar system earns one Solar Renewable Energy Certificate for every 1,000 kWh it generates, tracked through PJM’s GATS registry. As of 2026, standard Maryland SRECs trade at roughly $40–$45, while newer residential systems under 20 kW certified under the state’s Brighter Tomorrow Act earn a premium “Certified BT” rate closer to $57.50. A typical 9 kW Washington County system can generate an estimated $470–$680 a year in SREC income on top of whatever the system saves on your electric bill.
Washington County isn’t new to solar as a landowner. The county leases roughly 130 acres, including land at the Forty West Landfill, to solar developers under agreements that bring in more than $375,000 a year in combined rent and revenue, plus an estimated $100,000 in annual energy cost savings for county operations, with the solar partners covering financing and maintenance. It’s a real, practical example of the same math working at government scale that we build for individual homeowners here.
NEDES installs five system types in Washington County, each filed as its own permit package through the county’s Division of Permits and Inspections. The same in-house crew handles design, permitting, and installation for every type. That means you won’t be dealing with subcontractor hassles.
We size every system against 12 months of actual utility billing data, confirming Potomac Edison or Hagerstown Light service before finalizing a layout. Both building and electrical permits are required under county policy.
Read More
Commercial systems move through standard commercial plan review, separate from residential rooftop applications. We design around the applicable utility's commercial rate structure and preserve access to the 30% Section 48E federal credit, which remains in effect for commercial systems through 2027.
Read More
Adding a Level 2 charger is usually an electrical-permit-only project. We confirm your panel has room for a dedicated 240-volt, 40- to 50-amp circuit before scheduling anything.
Read More
If your usage has grown since your original installation, we can often expand an existing array. We check your inverter's remaining capacity and how close your system already sits to Maryland's net metering cap of 200% of baseline annual usage.
Read More
Roof replacement is the most common reason for a remount here. We remove your panels and racking, store them on-site, and reinstall once your roofer finishes, without disturbing the existing warranty.
Read More
4 Steps for Installation.
A Washington County solar installation moves through the same four stages everywhere, but the correct utility, the permitting authority, and the local approval timeline are specific to this territory.
We pull 12 months of real usage history (confirming whether Potomac Edison or Hagerstown Light serves your address) and model your roof for orientation, pitch, and shading before designing a layout.
Applications for both building and electrical permits go through Washington County’s Division of Permits and Inspections, which reviews solar submissions under its published solar and alternative energy policy.
Most residential systems install in one to two days depending on size. Washington County requires a post-installation inspection before the system can be energized. We schedule and attend it.
After county sign-off, we file your interconnection application with the correct utility: Potomac Edison or Hagerstown Light. Once approved, your net metering account activates, and your system starts earning full retail credit.
NEDES: The Leading Solar Company
| FACTOR | OTHER LOCAL INSTALLERS | NEDES |
|---|---|---|
| Workmanship warranty | 1–10 years (EnergySage marketplace standard) | 25 years |
| Response time on service calls | Days to weeks | Under 24 hours |
| Production monitoring | App, sometimes extra cost | Included, real-time |
| Financing options | Cash or loan only | Cash, loan, or lease/PPA |
| Services systems it didn't install | Rarely, or refuses outright | Yes; stated policy |
| Point of contact | Often subcontracted crews | In-house, start to finish |
Every project below is a completed, real Maryland installation. We’ve labeled each by its actual city rather than folding it into a generic “Washington County” caption.
installed 2025
installed 2025
lease financing
Customer Reviews
Our Solar installation team holds NABCEP PV Installation Professional certification. In the last decade, we installed hundreds of solar panels and helped multiple homeowners get completely off the grid. Here’s an overview of our latest testimonials:
Area Coverage
Does the federal solar tax credit still apply in Washington County?
Not for a cash or loan purchase. Section 25D expired for any system placed in service after December 31, 2025. A lease or PPA still reaches the 30% credit, but only through the system owner’s commercial Section 48E claim.
Is my property served by Potomac Edison or the City of Hagerstown?
It depends on the address. Most of Washington County is Potomac Edison territory, but properties inside Hagerstown’s city limits are often served by the municipal Light Department instead. We confirm this before finalizing your quote, since it affects both rates and interconnection.
What Maryland incentives are still available now that the federal credit has ended?
Maryland’s property tax exemption, the state’s 6% sales tax exemption on solar equipment, full retail net metering, and SREC income all remain fully in effect and are unaffected by the federal credit’s expiration.
Microinverters, string inverters, or SolarEdge: which is right for my roof?
It depends on shading. Simple, unshaded roofs typically perform well with string inverters. Roofs with partial shading or complex angles (common on older Hagerstown and Boonsboro properties) usually benefit from microinverters or SolarEdge optimizers, which isolate each panel’s output rather than letting one shaded panel drag down the whole string.
Does Washington County require a separate electrical permit for solar?
Yes. Washington County’s Division of Permits and Inspections requires both a building permit and an electrical permit for residential solar installations, per its published solar and alternative energy policy.
An NEDES energy consultant confirms which utility serves your property, reviews your actual usage, and shows a side-by-side comparison of system sizes, financing options, and realistic payback timelines.
