Are Solar Panels Worth It in Delaware? A State-by-State Standout

Delaware is small enough that solar installers sometimes overlook it in favor of New Jersey and Maryland. That is a mistake, because Delaware has one of the strongest combinations of solar incentives in the country. A cash grant from the state. An SREC market with prices that rival New Jersey’s. Full retail net metering through Delmarva Power. And electricity rates that are above the national average.

For a typical Delaware homeowner with a south-facing roof, solar panels pay for themselves in 6 to 7 years and generate $18,000 to $30,000 in net savings over the 25-year warrantied life of the system. Delaware is a top-tier solar state hiding in plain sight. Here is the math.

What Solar Panels Cost in Delaware

Solar in Delaware costs approximately $2.80 to $3.20 per watt before incentives, which is competitive with the national average. A typical residential system ranges from 6 to 8 kilowatts depending on home size and energy usage.

System Size	Installed Cost (Before Incentives)	After Federal Tax Credit	After All Incentives
5 kW	$14,000–$16,000	$9,800–$11,200	$7,000–$8,500
7 kW	$19,500–$22,500	$13,700–$15,800	$10,500–$12,500
10 kW	$28,000–$32,000	$19,600–$22,400	$15,500–$18,500

The federal solar investment tax credit covers 30 percent of the total system cost with no cap. On a $21,000 system, the federal credit is $6,300. This is a direct credit against taxes owed, not a deduction from taxable income. If you cannot use the full credit in one year, the remainder carries forward.

Delaware’s Green Energy Program, administered by the Delaware Department of Natural Resources and Environmental Control, offers a cash grant for residential solar installations. This is not a tax credit. It is a direct payment. The grant amount is based on system size and typically ranges from $2,000 to $4,000 for a standard residential installation. The program operates on annual funding cycles, and applications are accepted on a first-come basis. Apply as early in the program year as possible. Most Delaware solar installers handle the grant application as part of their service.

Delaware also offers a property tax exemption for solar systems. The added home value from a solar installation is excluded from property tax assessment indefinitely. In New Castle County, where property taxes are higher than the state average, this exemption saves approximately $200 to $400 per year depending on the assessed value increase. Over 25 years, the property tax exemption alone is worth $5,000 to $10,000.

After the federal credit and the Green Energy grant, a 7-kilowatt system in Delaware costs approximately $11,000 to $13,000 out of pocket. The solar renewable energy credit revenue then accelerates the payback further.

Delaware SRECs: The Hidden Revenue Stream

Delaware has a solar renewable energy credit market that generates ongoing income for solar owners. For every megawatt-hour of electricity your system produces, you earn one SREC. You sell these credits to electricity suppliers, who are legally required to purchase a specific number each year under Delaware’s renewable portfolio standard.

Delaware SREC prices have historically traded between $50 and $80 per credit, which is among the strongest pricing in the country. The state’s small geographic size and relatively low number of residential installations constrain SREC supply, which supports higher prices. In larger states with more solar capacity, SREC prices often fall below $30 as supply exceeds the mandated demand.

A 7-kilowatt system in Delaware generates approximately 9 to 10 megawatt-hours per year, which produces 9 to 10 SRECs annually. At a conservative $60 per SREC, that is $540 to $600 per year in additional income on top of your electricity savings. SREC payments typically continue for 15 to 20 years from the system registration date, depending on the specific program rules in effect at the time of registration.

Most Delaware homeowners use an SREC aggregator or broker to sell their credits. The aggregator registers your system with the tracking platform, collects your credits as they are generated each month, sells them on the market, and sends you payment minus a small commission of 3 to 5 percent. Your installer typically sets up the aggregator relationship during installation. SREC Trade and Sol Systems are the two largest aggregators operating in Delaware.

How Much Power Delaware Solar Panels Generate

Delaware receives approximately 4.5 peak sun hours per day averaged across the year. The state is small and geographically uniform. Wilmington, Dover, and Rehoboth Beach all receive similar annual solar exposure. There is no meaningful production difference based on location within the state.

A 7-kilowatt system generates approximately 9,500 to 10,500 kilowatt-hours per year. This covers most or all of the annual electricity usage of a typical Delaware home. Summer production peaks from May through August when days are long and air conditioning load is highest. Winter production in December and January drops to 40 to 50 percent of summer levels. Annual production estimates from reputable installers already account for this seasonal variation.

Coastal properties in Sussex and Kent counties should factor in salt spray and higher wind loads. Panels near the coast require more frequent cleaning to remove salt residue and should be mounted with racking rated for the higher wind speeds required by coastal building codes. The additional cost is modest, typically $200 to $500 for a standard residential system, and is included in the cost estimates above.

How Much You Save on Electricity

Delaware residential electricity rates average 14 to 16 cents per kilowatt-hour, which is slightly above the national average of 14 to 15 cents. Above-average rates improve solar economics because each kilowatt-hour of solar generation displaces more expensive utility electricity.

Delmarva Power, which serves most of Delaware, offers full retail rate net metering for residential systems up to 25 kilowatts. Excess generation during sunny months is credited at the same rate you pay for electricity. Credits roll over month to month with no annual expiration, which is a stronger policy than states that zero out credits annually at a lower rate.

A 7-kilowatt system generating 10,000 kilowatt-hours per year at 15 cents per kilowatt-hour saves approximately $1,500 per year. Combined with SREC income of $540 to $600, the total annual benefit is approximately $2,050 to $2,100. Against a net system cost of $11,500 to $12,500, the simple payback period is 5.5 to 6.1 years. This is comparable to California and Massachusetts, which are widely considered the best solar states in the country.

Municipal Utilities: A Different Calculation

About 10 percent of Delaware residents are served by municipal utilities rather than Delmarva Power. The largest municipal utilities include the Dover Electric Department, the Newark Electric Department, and the Lewes Board of Public Works. These municipal utilities are not regulated by the Delaware Public Service Commission in the same way Delmarva Power is, and they are not required to offer full retail net metering or participate in the state’s SREC program.

If you are served by a municipal utility, contact them directly and ask for their distributed generation interconnection policy before getting solar quotes. Some municipal utilities offer net metering comparable to Delmarva Power. Others offer much lower export compensation rates or do not offer net metering at all. The economics of solar under a municipal utility can be significantly worse than under Delmarva Power, potentially to the point of not being financially viable. This is the single most important variable to check before committing to solar in Delaware.

25-Year Financial Picture

Over 25 years, a Delaware Delmarva Power customer with a 7-kilowatt system can expect net savings of $20,000 to $30,000 after recovering the initial investment. Approximately $8,000 to $12,000 of this comes from SREC revenue during the first 15 to 20 years. The remaining $12,000 to $18,000 comes from electricity savings, assuming rates increase at 2 to 3 percent per year. The inverter replacement at year 12 to 15, costing $1,500 to $2,500, is factored into these numbers.

For municipal utility customers without full net metering, the savings are at the low end of the range or potentially below breakeven. The SREC revenue still applies, which partially offsets the loss of net metering value, but it may not be enough to make the investment positive on its own.

Buying vs. Financing vs. Leasing

Cash purchase produces the highest return because you capture all incentives and savings. The Green Energy grant and SREC revenue flow to the system owner. A solar loan allows zero-down installation while preserving ownership of the incentives. Interest rates for solar loans in Delaware range from 4 to 8 percent. The monthly loan payment is typically lower than the previous electric bill, making the system cash-flow positive from month one.

A lease or power purchase agreement means a third party owns the panels. The third party keeps the federal credit, the Green Energy grant, and the SREC revenue. The homeowner pays a fixed monthly rate for the electricity. This is generally the least advantageous structure for Delaware homeowners because the state’s incentives are so strong that capturing them through ownership produces significantly higher lifetime savings. Leasing makes sense only if you cannot use the federal tax credit due to low tax liability and do not want to finance a purchase.

When Solar Is Not Worth It in Delaware

Heavy tree cover. Delaware’s mature deciduous trees shade many roofs. If your roof receives less than 4 hours of direct sun per day, solar may not produce enough to justify the investment.

Municipal utility without net metering. This is the largest risk factor in Delaware. Confirm your utility’s net metering policy before proceeding.

Moving within five years. With a payback of 5.5 to 6 years, you need to stay in the home long enough to reach the breakeven point. If you sell before then, you recover some value through increased home sale price but not the full installation cost.

Old roof. Delaware’s coastal location means roofs take abuse from nor’easters, hurricanes, and salt air. Replace a roof with less than 10 years of remaining life before installing solar. Panel removal and reinstallation for a roof replacement costs $3,000 to $6,000.

HOA restrictions. Delaware law under Title 25, Section 318 protects the right to install solar panels, but HOAs can impose reasonable restrictions on placement, such as requiring panels to be mounted on the rear roof surface rather than visible from the street. They cannot ban solar outright. Review your HOA covenants and submit the architectural review application early in the process.

Solar Plus Battery in Delaware

Delaware’s full retail net metering with no annual true-up reduces the financial case for a battery. You can use the grid as your battery, exporting excess daytime solar and drawing from the grid at night using credits at the same rate. A battery adds $8,000 to $12,000 to the system cost and extends the payback period.

However, coastal Delaware from Lewes to Fenwick Island experiences power outages from hurricanes and nor’easters that can last multiple days. A battery provides backup power that net metering alone cannot. For coastal homeowners where outage resilience is a priority, the battery premium is justified by the value of backup power rather than by pure energy economics. The federal tax credit applies to batteries charged exclusively by solar, whether installed with the initial system or added later.

Frequently Asked Questions

How do I apply for the Delaware Green Energy grant?

Your solar installer typically handles the application. The installer submits documentation including the system design, equipment specifications, and proof of site control to the Delaware Department of Natural Resources and Environmental Control. The grant is awarded on a first-come basis within each annual funding cycle. The funds are disbursed after the system is installed and inspected. If your installer does not handle the application, you can apply directly through the DNREC website. Confirm before signing your contract that the installer will manage the grant process and that the grant amount is included in your quoted net cost.

Does Delmarva Power offer net metering?

Yes. Delmarva Power offers full retail rate net metering for systems up to 25 kilowatts. Excess generation credits roll over month to month and do not expire annually. This is one of the more favorable net metering policies in the country and a significant contributor to Delaware’s strong solar economics. At the time of writing, Delmarva Power has not proposed major changes to its net metering structure. Policy can change. Confirm the current tariff before making a final decision.

Are Delaware SREC prices stable?

SREC prices are determined by supply and demand in the SREC market, not by a fixed government rate. Prices can and do fluctuate. Delaware’s small size and the legislated demand for SRECs under the renewable portfolio standard have historically supported prices in the $50 to $80 range, which is higher than neighboring states. However, if a large number of new solar installations come online quickly, the increased SREC supply could push prices lower. Conversely, if the legislature increases the solar requirement in the renewable portfolio standard, prices could rise. The SREC revenue stream should be treated as a strong probability, not a guarantee. Model your solar investment at a range of SREC prices to understand the sensitivity of your return.