Solar Panel Payback Calculator for Delaware
Delaware (DE) offers good solar potential with an average of 4.2 peak sun hours per day. The average residential electricity rate is 14.5 cents per kWh, and solar installation costs average $2.95 per watt. Based on these figures, a typical 6 kW residential solar system in Delaware has an estimated payback period of 11.6 years and generates $23,983 in total savings over 25 years.
Solar System Size Comparison for Delaware
The table below compares four common residential solar system sizes for Delaware homeowners. All calculations use the state average electricity rate of 14.5 cents per kWh, average installation cost of $2.95/W, and 4.2 peak sun hours. The federal 30% Investment Tax Credit is included in all scenarios.
| System Size | Gross Cost | Federal Credit | Net Cost | Annual Output | Annual Savings | Payback | 20-Year Savings | 25-Year Savings |
|---|---|---|---|---|---|---|---|---|
| 4 kW | $11,800 | $3,540 | $8,260 | 4,906 kWh | $711 | 11.6 years | $9,884 | $15,992 |
| 6 kW | $17,700 | $5,310 | $12,390 | 7,358 kWh | $1,067 | 11.6 years | $14,823 | $23,983 |
| 8 kW | $23,600 | $7,080 | $16,520 | 9,811 kWh | $1,423 | 11.6 years | $19,765 | $31,978 |
| 10 kW | $29,500 | $8,850 | $20,650 | 12,264 kWh | $1,778 | 11.6 years | $24,707 | $39,974 |
Solar Energy in Delaware: What You Need to Know
Delaware offers modest solar incentives and SREC markets. The state is small but has made strong commitments to renewable energy with its Renewable Portfolio Standard.
Electricity Rates in Delaware
The average residential electricity rate in Delaware is 14.5 cents per kWh, which is below the national average of approximately 16 cents per kWh. These moderate rates provide a reasonable foundation for solar savings. Combined with the federal tax credit and any state incentives, solar remains a strong investment for most Delaware homeowners.
Peak Sun Hours and Solar Production
Delaware averages 4.2 peak sun hours per day, which is moderate but still viable for residential solar. Many successful solar installations operate across the Northeast and Midwest with similar sun hours. Modern panels are increasingly efficient even in diffuse light conditions. A 6 kW system in Delaware produces approximately 7,358 kWh per year, accounting for standard system efficiency losses and typical weather patterns.
Delaware Solar Incentives and Programs
Green Energy Program rebate through Delmarva Power. SRECs available and trade at moderate prices. Net metering available for systems up to 25 kW. No state income tax credit specifically for solar.
Incentive Summary for Delaware
- Federal Tax Credit: 30% ITC (available through 2032)
- State Tax Credit: None
- Net Metering: Available
- SRECs: Available — provides additional ongoing revenue
- Avg. Installation Cost: $2.95/watt (before incentives)
How Delaware Compares to Similar States
Below is a comparison of Delaware with five states that have similar solar conditions. All calculations are based on a 6 kW residential system using each state's average electricity rate and sun hours.
| State | Sun Hours | Rate (c/kWh) | Cost/Watt | Net Cost | Payback | 25-Yr Savings |
|---|---|---|---|---|---|---|
| Delaware | 4.2 | 14.5c | $2.95 | $12,390 | 11.6 years | $23,983 |
| District of Columbia | 4.2 | 14.5c | $3.30 | $13,860 | 13.0 years | $22,513 |
| Iowa | 4.2 | 14.5c | $3.00 | $12,600 | 11.8 years | $23,773 |
| Maryland | 4.2 | 16c | $3.05 | $12,810 | 10.9 years | $27,325 |
| North Dakota | 4.2 | 11.5c | $3.10 | $13,020 | 15.4 years | $15,827 |
| Virginia | 4.3 | 13c | $2.95 | $12,390 | 12.7 years | $21,000 |
Environmental Impact of Solar in Delaware
Installing a 6 kW solar system in Delaware offsets approximately 6,291 pounds of CO2 per year, which is equivalent to planting 51.9 trees annually. Over the 25-year lifespan of your solar system, that adds up to roughly 157,275 pounds of avoided carbon emissions. Choosing solar energy is one of the most impactful steps a homeowner can take to reduce their carbon footprint and contribute to cleaner air in Delaware communities.
Ready to Calculate Your Exact Savings?
Use our Solar Payback Calculator to enter your specific system size, electricity rate, and roof shading conditions for a personalized estimate. Or browse all 50 states + DC to compare solar economics across the country.