Solar panels in Rockville, MD: cost, incentives, and quotes

Rockville sits in Montgomery County in Pepco\u2019s service territory, which puts it in one of the strongest residential solar markets in the country. The combination of Maryland\u2019s 1:1 retail-rate net metering, an active SREC market, the Maryland Residential Clean Energy Grant, state tax exemptions, and a few address-specific edge cases (DC Pepco feeder lines accessing the much more lucrative DC SREC market) produces 7\u201310 year payback even after the federal residential tax credit ended in December 2025. Rockville\u2019s solar story has some quirks worth understanding before you sign.

Why solar makes financial sense in Rockville

Pepco residential rates run around 16.85 cents per kilowatt-hour, modestly above the Maryland state average and meaningfully above the US average. The higher rate means every kWh your solar system produces is worth more in Rockville than in many other markets. Rockville averages 4.5 to 5 peak sun hours per day, sufficient for solid year-round production on a properly sized system.

The Maryland state programs do the heavy lifting on the economics. The SREC market alone produces $480\u2013$880 per year on a typical 7 kW system at current prices. The Maryland Residential Clean Energy Grant adds another $1,000 if you can secure it before annual funding runs out (the program historically depletes mid-year). Stacked with sales tax exemption, property tax exemption, and the federal credit (for systems placed in service before December 31, 2025), the combined value moved many homeowners from "should I bother" to "this is obvious." With the federal credit gone, the math is tighter but still positive for most Rockville homes.

Pepco is not Potomac Edison (this confuses people)

Maryland has four major investor-owned electric utilities, and two of them have confusingly similar names. Pepco (Potomac Electric Power Company) serves Rockville, much of Montgomery County, Prince George\u2019s County, and the District of Columbia. Potomac Edison (a FirstEnergy subsidiary) serves Frederick, Hagerstown, Cumberland, and western Maryland. The two utilities have nothing to do with each other operationally despite the similar names.

For Rockville solar customers, this matters because:

• Pepco has its own interconnection portal and process, distinct from Potomac Edison or BGE
• Pepco rates are different from Potomac Edison rates
• Installers experienced with one Maryland utility aren\u2019t necessarily fluent with the other
• The DC Pepco feeder line opportunity (see below) applies only to Pepco territory

The DC Pepco feeder line opportunity (Rockville-specific)

Here\u2019s a Rockville-specific edge case worth knowing about. Some homes in Montgomery County near the DC border are connected to DC Pepco feeder lines rather than Maryland Pepco lines, despite the home itself being in Maryland. From an electrical grid perspective, these homes are part of the DC grid.

The practical consequence: homes on DC feeder lines can qualify for the DC SREC market instead of the Maryland SREC market. The DC SREC market is currently among the most lucrative in the United States, with DC SRECs trading in the $300\u2013$400 range compared to Maryland\u2019s $60\u2013$80 range. A homeowner generating 10 SRECs per year captures $3,000\u2013$4,000 of SREC income annually in the DC market versus $600\u2013$800 in the Maryland market. Over a 10\u201315 year window, the difference can be $20,000\u2013$30,000.

The map of DC feeder lines in Montgomery County is publicly available, and a competent installer can check your specific address. If you\u2019re in Rockville (particularly the southern and southeastern parts closer to DC), confirming feeder line status is the single highest-value early-stage check on your solar project.

Pepco net metering specifics

Maryland law requires Pepco to offer 1:1 retail-rate net metering, which means excess solar exports earn credits at the same rate you pay for grid electricity. Credits roll over month to month and now under the Net Metering Flexibility Act of 2023 carry forward through the annual reset, providing more durability than the old structure.

Important: Maryland net metering credits cover the energy (generation) portion of your Pepco bill but not the delivery or fixed monthly charges. A typical Pepco residential bill is roughly 50% energy and 50% delivery and fixed costs. Even with solar that fully offsets your energy usage, you\u2019ll still see a $25\u2013$40 monthly bill for delivery and fixed components. Make sure your savings estimate reflects this; "$0 bill" is not a realistic expectation under Pepco net metering.

Pepco\u2019s online Net Metering application portal handles interconnection paperwork in one place. Your installer files the application, you review and approve, the application fee is paid, and Pepco issues an Authorization to Install. Final permission to operate typically follows 2\u20134 weeks after the final installation inspection.

The 2026 federal credit reality

The 30% federal residential tax credit (Section 25D) ended December 31, 2025 under the One Big Beautiful Bill Act signed July 4, 2025. For customer-owned solar installed in Rockville in 2026 and beyond, the federal credit is no longer available. The commercial credit (Section 48E) continues for solar leases and PPAs through 2027\u20132030 deadlines.

Maryland is one of the states where this federal change hurts less than elsewhere. The state-level programs (SREC market, $1,000 grant, net metering, sales/property tax exemptions) carry substantial value on their own. Rockville payback stays in the 7\u201310 year range in 2026; homes lucky enough to be on DC Pepco feeder lines can see substantially shorter payback courtesy of DC SREC market access.

Permitting in Rockville

Residential solar in Rockville requires permits through both the City of Rockville (for homes inside city limits) or Montgomery County (for homes in unincorporated areas of the county). The city/county permit covers building and electrical work; Pepco interconnection is a separate parallel process. Montgomery County permit review typically takes 2\u20136 weeks, and the full timeline from signed contract to running system runs 8\u201312 weeks.

Many Rockville neighborhoods are governed by HOAs, particularly newer developments like King Farm, Fallsgrove, and similar master-planned communities. Maryland\u2019s solar rights statute (Real Property Code Section 2-119) limits HOA restrictions: HOAs cannot impose restrictions that significantly raise the cost of solar installation. Most HOAs approve solar with formal architectural review applications.

Getting quotes in Rockville

Start by estimating what a system would cost and produce on your specific roof. Our solar calculator uses satellite roof analysis to size a system and estimate output and savings for your Rockville address. Then compare quotes from pre-screened local installers familiar with Pepco\u2019s online interconnection portal and Maryland\u2019s SREC registration process. Critically, ask each installer to check whether your specific address is on a DC Pepco feeder line; if it is, the DC SREC market access changes your project economics meaningfully and most installers should know how to verify this.