Solar Savings Index 2026: What This Report Is
The Solar Savings Index is a benchmark report built from SolarSavingsAI's city-level ROI pages. The goal is to translate thousands of localized calculations into a clear, national picture of where solar delivers the strongest financial outcomes, why those outcomes differ by state, and how homeowners can use the benchmarks to make a better decision.
This is not a marketing list and it is not a list of installers. It is a data-first index designed to answer a single question with clarity: Where does solar pay off fastest, and what drives the difference?
Use this page as a strategic map, then drill down into your city, state, and utility pages for precision.
What The Index Covers
- National benchmarks for payback, 20-year savings, electricity rates, and system costs.
- State leaderboards for highest savings, fastest payback, and strongest solar resource.
- Drivers analysis that explains why two similar states can have very different ROI.
- Action guidance for financing and next steps.
Methodology: How The Solar Savings Index Was Built
The index is derived from SolarSavingsAI's city-level ROI estimates. Each city page contains standardized values calculated from local utility rates, solar resource data, and incentive assumptions. For the 2026 edition, a 200-city sample across 20 states was analyzed to produce benchmark medians and averages. This is a Phase 1 snapshot designed to scale to the full city dataset in future updates.
Data Inputs Used
- Average residential electricity rate (local $/kWh)
- Peak sun hours per day (solar resource)
- Typical system size (kW)
- Gross system cost and net cost after incentives
- Estimated 20-year savings
- Estimated payback period (years)
Why A Sample?
The city pages are updated regularly. The 200-city sample provides a stable baseline for comparisons while allowing rapid updates. The 2026 index is intentionally conservative with precise claims and focuses on directional insight rather than presenting the index as a final census.
National Benchmarks (200-City Sample)
These benchmarks represent the median and average values across the sample. Use these as a baseline for comparing your city.
| Metric | Median | Average |
|---|---|---|
| Peak sun hours (per day) | 4.8 | 4.9 |
| Electricity rate ($/kWh) | $0.14 | $0.16 |
| 20-year savings | $23,400 | $31,200 |
| Payback period (years) | 6.2 | 6.4 |
| System size (kW) | 7.1 | 7.3 |
| Gross system cost | $14,500 | $14,900 |
| Net system cost | $9,850 | $9,200 |
Interpretation: A 6-to-7 year payback is a realistic national baseline. Markets with rates well above $0.16/kWh or sun hours above 5.2 typically beat this benchmark by a full year or more.
State Leaderboards
The following leaderboards illustrate where the model shows the strongest financial outcomes. These are benchmarks, not guarantees. Always check your local city page for the final estimate.
Top States by Median 20-Year Savings
| Rank | State | Median 20-Year Savings |
|---|---|---|
| 1 | Hawaii | $90,000+ |
| 2 | California | $60,000+ |
| 3 | Arizona | $40,000+ |
| 4 | Connecticut | $35,000+ |
| 5 | Florida | $30,000+ |
High-savings states combine elevated electricity rates with strong solar resource or supportive incentives. Hawaii and California top the list because each kWh of solar offsets exceptionally expensive grid power.
Fastest Payback (Lowest Median Years)
| Rank | State | Median Payback |
|---|---|---|
| 1 | Hawaii | 2-4 years |
| 2 | California | 4-6 years |
| 3 | Arizona | 4-6 years |
| 4 | Colorado | 5-7 years |
| 5 | Florida | 5-7 years |
Highest Electricity Rates
| Rank | State | Typical Rate Range |
|---|---|---|
| 1 | Hawaii | $0.30-$0.45/kWh |
| 2 | California | $0.22-$0.40/kWh |
| 3 | Connecticut | $0.20-$0.32/kWh |
| 4 | Massachusetts | $0.19-$0.30/kWh |
| 5 | New York | $0.18-$0.28/kWh |
Strongest Solar Resource (Sun Hours)
| Rank | State | Average Sun Hours |
|---|---|---|
| 1 | Arizona | 6.0+ |
| 2 | Nevada | 5.8+ |
| 3 | California | 5.5+ |
| 4 | New Mexico | 5.4+ |
| 5 | Colorado | 5.2+ |
Why Payback Varies So Much
Payback is not a single-variable story. The index shows the fastest payback states are not always the same states with the strongest sun hours. Five factors work together:
- Electricity rates. Every cent per kWh increases the savings from each solar kWh you generate.
- Solar resource. Higher sun hours increase annual production without increasing system cost.
- Net system cost. Incentives and local pricing can shift the cost base by thousands of dollars.
- Net metering rules. Export credits determine how much value you get for excess generation.
- Right sizing. Systems that match usage outperform systems that are oversized for load.
For a local view of incentives, use the state hub pages such as California solar rebates or Texas solar rebates. For a utility-level view, visit pages like PG&E solar policy or Duke Energy net metering.
How To Use The Index In Real Decisions
Step 1: Compare Your City To The Benchmarks
If your city's payback is under 6 years, you are ahead of the national median. If it is above 8 years, the financing structure and incentives will matter far more. Start with the city ROI page for your location, such as Phoenix, AZ, Orlando, FL, or Denver, CO.
Step 2: Validate Incentives And Utility Policy
State and utility incentives can shift ROI more than hardware costs. Use the state incentives hub, then the specific utility page for your provider. In California, the combination of high rates and net billing makes storage more valuable; in Texas, buyback terms vary by utility.
Step 3: Choose A Financing Strategy That Preserves ROI
Financing can add or remove years from payback. Start with the solar financing hub, then compare options like solar loan vs. solar lease or cash vs. financing to see which preserves long-term savings.
Step 4: Use Company Pages To Get The Right Quotes
When the index shows strong ROI in a market, the next step is quotes. For example, review best solar companies in California or best solar companies in Florida before gathering bids.
Regional Patterns The Index Reveals
1) The Sun Belt Advantage
States in the Southwest and parts of the Southeast combine strong sun hours with good incentives. This drives the fastest payback for homeowners who can access competitive financing.
2) High-Rate Coastal Markets
States like California, Massachusetts, New York, and Hawaii show the highest lifetime savings even when sun hours are not the highest. High rates create a strong savings multiplier.
3) Interior Markets Depend On Policy
Many interior states have good sunlight but average rates. In these markets, net metering policy and local rebates determine whether payback stays below 8 years.
Payback Versus Lifetime Savings: Two Different Outcomes
It is common to equate fast payback with the best overall savings, but the index shows they are related, not identical. Payback is the time required to recoup the net cost of the system. Lifetime savings represent the long-run value of the energy produced minus the full cost of ownership. A state with fast payback can still deliver lower lifetime savings if electricity rates are moderate or if export credits decline over time. Conversely, a state with slightly longer payback may deliver larger lifetime savings if electricity rates are high and remain high.
To understand the distinction, consider a simplified comparison:
- Market A: Payback of 5.5 years, 20-year savings of $26,000.
- Market B: Payback of 7.5 years, 20-year savings of $42,000.
Market A returns capital faster. Market B creates more total value over the system life because the avoided cost of electricity is higher. When making a decision, use payback as a risk lens and savings as a value lens.
What Moves The Needle: Sensitivity Analysis
The index includes a sensitivity review to highlight which variables most strongly shift ROI. These are not predictions; they are directional levers based on typical residential assumptions.
1) Electricity Rate Change (+$0.05/kWh)
An increase of $0.05/kWh often improves 20-year savings by $8,000 to $15,000 for a typical system and can shorten payback by 1 to 2 years. This is why high-rate markets are dominant in the savings leaderboard.
2) Net System Cost (-$2,000)
A $2,000 reduction in net cost can reduce payback by 0.7 to 1.2 years. This can happen through stronger incentives, lower installer pricing, or choosing a system size that more closely matches usage.
3) Sun Hours (+0.5 hours/day)
Adding half an hour of average sun per day can raise annual production by 8-12% and typically improves lifetime savings by $3,000 to $7,000 depending on rate and system size.
4) Export Credit Reduction
In markets shifting away from full retail net metering, export credits can drop by 50-70%. The index reflects this by showing lower savings in those markets unless storage is added or system sizing is adjusted. Use net metering vs. time-of-use to understand how these structures affect value.
State Archetypes: How Different Markets Behave
High-Rate, Moderate Sun (Northeast)
States like Massachusetts and New York often show large lifetime savings despite average sun hours. The high value of each solar kWh creates strong economics even if production per panel is lower.
High-Sun, Moderate Rate (Interior West)
States like Colorado and parts of the Mountain West exhibit strong payback because production is high. Savings rise further when local incentives reduce net cost.
High-Sun, High-Rate (Top-Tier Markets)
Hawaii, parts of California, and some desert markets combine high production with very expensive grid power. These are the fastest payback and highest savings markets in the index.
Low-Rate, Moderate Sun (Challenging Markets)
States with low utility rates and limited incentives tend to show longer payback even if sun hours are decent. In these markets, the financing structure and installer pricing make the difference between a 7-year and a 10-year payback.
Installer Pricing Spread: The Hidden Variable
Two homeowners in the same city can see very different ROI based on installer pricing and financing terms. The index normalizes costs to a reasonable market range, but real-world quotes can vary by $0.50 to $1.00 per watt. That pricing gap can shift payback by 1 to 3 years.
Before acting on the index, use it as a directional guide, then validate with real quotes from qualified providers in your market. The best-company pages for each state exist to help filter for quality and competitive pricing.
Battery Storage: When It Changes The Index
In states transitioning to net billing or time-of-use export credits, storage can restore savings that would otherwise be lost. This is especially true in California and other markets where midday export credits are low. Adding a battery increases upfront cost, but it can also preserve long-term savings by shifting solar energy to evening peak rates.
If your utility has reduced export credits, review the tradeoff using battery vs. grid-tied to see if storage makes economic sense in your market.
Limitations And How To Interpret The Index
- It is a benchmark, not a quote. Installer pricing, roof complexity, and local incentives can shift results.
- Policy can change. Net metering rules evolve. The index is updated quarterly to reflect major shifts.
- Household usage varies. A larger home with higher usage can see stronger ROI because more solar energy offsets expensive grid electricity.
- Roof geometry matters. Shading or suboptimal orientation reduces production versus the modeled baseline.
Glossary Of Key Metrics
- Payback period: The number of years required for cumulative savings to equal the net cost of the system.
- 20-year savings: Total savings over 20 years after accounting for system cost and residual utility costs.
- Net system cost: The cost of the system after the federal tax credit and typical state incentives.
- Peak sun hours: The average daily solar resource used to estimate annual energy production.
- Export credits: Compensation for excess solar energy sent back to the grid.
Common Reasons A City Underperforms The Index
- Low electricity rates. The savings per kWh are smaller, so the payback stretches.
- Weak net metering. Export credits may be closer to wholesale rates.
- High install pricing. Local labor or permitting can increase system cost.
- Roof limitations. Shading or orientation can reduce production.
- Oversizing. A system that produces too much excess power can reduce ROI.
Index-Driven Action Plan
- Benchmark your city. Use the index to set expectations for payback and savings.
- Verify incentives. Confirm state and utility policy in your area.
- Compare financing. Use the comparison pages to avoid options that erode ROI.
- Get installer quotes. Use the best-company pages for your state to choose vetted providers.
- Re-evaluate with storage. In net-billing markets, check battery vs. grid-tied options.
FAQ: Solar Savings Index
Is this a ranking of the best states to go solar?
No. The index ranks financial outcomes, not installer quality, policy stability, or customer service. Use it to compare ROI, then verify local factors.
Does the index replace city pages?
No. The index provides a national view. Your city page is the detailed estimate. Use both for a complete picture.
Will the index be updated?
Yes. The intent is quarterly updates with expanded city coverage, refreshed rate assumptions, and revised benchmarks.
Suggested Update Structure
Last updated: March 2, 2026
- Data coverage: 200 city ROI pages / 20 states (Phase 1)
- Next planned update: Quarterly expansion to full city dataset
Change Log
- 2026-03-02: Initial Solar Savings Index published with Phase 1 benchmarks.