Last updated: March 11, 2026
Your installer quoted you $8,000 in incentives. A website you found says there’s a rebate worth $3,500. Your neighbor got a different number from a different company.
All three could be wrong.
Solar incentive programs change constantly. Funding runs out. Programs expire. Utilities update their tariffs mid-year. A rebate that existed six months ago may be waitlisted today. An article published last year may still be ranking on Google with numbers that are no longer accurate.
The only way to know what’s actually available to you right now is to check primary sources. This article shows you exactly how — in under 30 minutes, using free public databases and government websites.
Why Incentive Information Goes Stale So Fast
Most solar incentive content online has a structural problem: the people writing it aren’t updating it every time a program changes, but the programs change constantly.
There are four ways an incentive can become unavailable without anyone announcing it:
Programs run out of funding. California’s SGIP battery rebate program is a good example. SGIP is funded in tranches — when a tranche fills up, new applicants go on a waitlist. As of early March 2026, every SGIP budget is fully reserved. That’s not widely reflected in search results that still describe it as available. (See our full California SGIP rebate guide for current status and waitlist details.)
Programs expire by date. The federal 30% residential solar tax credit expired December 31, 2025, eliminated by the One Big Beautiful Bill Act signed July 4, 2025. It doesn’t phase down — it simply doesn’t exist for homeowner-purchased systems installed in 2026. Thousands of web pages still describe it as active.
Programs hit capacity caps. Massachusetts’ SMART program operates with an annual capacity block — a fixed number of megawatts available per program year. When that capacity fills, the program closes to new applicants for the year. The cap resets annually, but if you’re applying in November and blocks are full, you wait. (Full details in our Massachusetts solar incentives guide.)
Export rates change. California’s net metering policy shifted from NEM 2.0 to the Net Billing Tariff (NBT) in April 2023, cutting export credits by roughly 75%. That change is reflected in CPUC filings — but not in every solar quote or article that still discusses California net metering as if the old rules apply.
Understanding why information goes stale tells you where to look for the real numbers.
The Four Sources That Are Always Current
| Source | Best for | What it misses | Update frequency |
|---|---|---|---|
| DSIRE (dsireusa.org) | Finding what programs exist in your state | Current funding status, waitlist status | Varies by listing |
| State energy office | Current program rates, capacity, and eligibility | Quality varies significantly by state | Real-time to annual |
| Utility tariff filings | Export credit rates, fixed charges, program terms | Requires reading dense tariff documents | Filed before each rate change |
| State PUC database | Rule changes, open investigations, finalized decisions | Regulatory language can be difficult to parse | Updated in real time as filings are submitted |
1. DSIRE (dsireusa.org)
DSIRE (Database of State Incentives for Renewables and Efficiency), is the most comprehensive public directory of solar incentives in the United States. It’s managed by the NC Clean Energy Technology Center at NC State University and covers more than 2,800 active policies across all 50 states.
What DSIRE is good for: Finding out what programs exist in your state. It’s the right first stop when you’re building a list of incentives to investigate.
What DSIRE doesn’t tell you: Whether a program still has funding. Whether a rebate is currently waitlisted. Whether rates have changed since the listing was last updated.
Every DSIRE listing includes a “Last Updated” date. That date means someone verified the program existed — it doesn’t mean the program is currently funded or accepting applications. For any program you find on DSIRE, treat it as a lead, not a confirmation. Your next step is always to go to the primary source.
How to use it: Go to dsireusa.org, enter your zip code or click your state, and filter by technology type (solar) and incentive type (rebates, tax credits, etc.). Note the program name, administering organization, and the link to the program’s official page.
2. State Energy Office Pages
Every state has an energy office that administers or tracks state-level solar incentives. The quality varies — California, Massachusetts, and New York have detailed, well-maintained program pages. Some smaller states have thinner coverage. But for states where significant programs exist, the state energy office page is the authoritative source for program status, current rates, and eligibility.
Examples of high-quality state sources:
- California: cpuc.ca.gov (SGIP, Net Billing Tariff, program proceedings)
- Massachusetts: mass.gov/solar-massachusetts-renewable-target-smart (SMART 3.0 program details, updated with each program year)
- New York: nyserda.ny.gov (NY-Sun incentive program)
What to look for: Program year dates, current capacity availability, and whether the program is actively accepting applications. For programs like SMART in Massachusetts, the state publishes an annual program year report that sets the rates and capacity for that year — that document is the ground truth.
Red flag: If a state energy office page hasn’t been updated in over a year and the program involves annual funding cycles, verify with the administering organization directly before relying on the numbers.
3. Utility Tariff Filings and Rate Schedules
Net metering rates, export credits, and battery rebates don’t live in press releases — they live in utility tariff documents. Before a utility can change any rate or program, it must file that change with the state public utilities commission (PUC). Those filings are public record.
Why this matters: An installer might quote you a net metering credit rate based on how the tariff worked last year. The actual current rate is in the tariff schedule your utility filed most recently.
How to find it:
- Go directly to your utility’s website and search for “tariff schedules” or “rate schedules”
- Look for the specific tariff that applies to solar customers (in California, this is the Solar Billing Plan / Net Billing Tariff; in other states, it’s typically labeled “Net Metering Tariff” or similar)
- The document will include the current export credit rate, any fixed monthly charges, and eligibility conditions
For California’s three major investor-owned utilities, the Net Billing Tariff export rates are published at the CPUC website and updated annually via the Avoided Cost Calculator (ACC). The exact rates depend on the month, hour of day, and whether it’s a weekday or weekend — 576 different rates in total. Any installer claiming a single flat export credit rate for California is oversimplifying.
4. State PUC Databases
State public utilities commissions are where utility rate changes, net metering rules, and program modifications get decided and documented. Every PUC maintains a public docket database — a searchable record of every proceeding, filing, and decision.
The CPUC is the gold standard example. At cpuc.ca.gov, you can search open and closed proceedings by docket number or keyword. The NEM Revisit proceeding (R.20-08-020) contains every decision and modification to California’s net metering rules since 2020. If you want to understand exactly what changed and when, it’s all there.
For other states: The National Association of Regulatory Utility Commissioners (NARUC) at naruc.org maintains links to every state PUC website. From there, the process is the same — find the proceeding relevant to solar or net metering, and read the most recent decision.
When to use it: PUC databases are most useful when you’ve heard that a program is changing and want to verify the exact terms, timeline, and whether the change has been finalized. They’re also the right place to check for open investigations — if a state is actively considering reducing net metering rates, there will be an open docket.
How to Verify the Five Most Common Incentive Types
| Incentive type | Stability | Can expire mid-year? | Where to verify |
|---|---|---|---|
| State tax credit | High — set by legislation | No | State Department of Revenue |
| Utility rebate | Low — funded from ratepayer pools | Yes | Utility website, program status page |
| Net metering / net billing rate | Medium — changes via PUC proceeding | No, but changes with little notice | Utility tariff schedule, state PUC docket |
| Battery storage rebate | Very low — tranche-funded, high demand | Yes | Program administrator metrics page |
| Property tax exemption | Very high — written into statute | No | State legislature website, county assessor |
State Tax Credits
State tax credits are among the most stable incentives — they’re set by legislation and don’t depend on annual funding. But they can still be changed or expired by new legislation, and the eligibility rules matter.
How to verify:
- Search your state’s Department of Revenue or Department of Taxation website for “solar tax credit”
- Confirm the credit percentage, dollar cap, and any income or system size eligibility requirements
- Cross-check against the most recent version of the relevant state statute
Don’t rely on aggregator sites for tax credit figures. A state DOR page that was last updated in 2024 is more reliable than a solar company’s blog post from 2026.
Utility Rebates
Utility rebates are funded from ratepayer pools and can be exhausted mid-year. The program page your installer sent you may have been accurate last quarter.
How to verify:
- Go directly to your utility’s website
- Find the specific rebate program by name
- Look for current program status — many utility rebate pages show “Open,” “Waitlisted,” or “Closed” explicitly
- If the page hasn’t been updated recently, call the utility’s customer service line and ask for the current program status
For programs with tranche-based funding (like SGIP), also check the program administrator’s metrics page. For SGIP, that’s selfgenca.com/home/program_metrics — updated nightly. Our California SGIP rebate guide walks through the full application process and current budget status.
Net Metering / Net Billing Rates
Net metering rates can change whenever a utility files a new tariff and the PUC approves it. In restructured states, the rate may also depend on whether you’re served by the utility or a Community Choice Aggregation (CCA) provider.
How to verify:
- Find your utility’s current net metering or solar billing tariff schedule (see Section 3 above)
- Note the export credit rate structure — is it a flat retail rate, a time-varying avoided cost rate, or something in between?
- If you’re in California under the Net Billing Tariff, the export rates are time-varying and published annually by the CPUC — look up the current “vintage year” rates for your utility at cpuc.ca.gov
Key question to ask your installer: What export rate did you use to calculate my bill savings, and where did that number come from?
Battery Storage Rebates
Battery rebates are typically the most volatile incentive category. They involve large dollar amounts, limited funding pools, and high demand.
How to verify:
- Identify the administering organization (state energy commission, utility, or third-party program administrator)
- Go directly to that organization’s program page and check current funding status
- For waitlisted programs, ask what the current estimated wait time is and whether you can install now and receive the rebate later — or whether you must wait for a reservation letter before installing
For SGIP in California: do not install before receiving a Confirmed Reservation Letter if you’re counting on the rebate to make the numbers work. The program is currently waitlisted and new applications receive no immediate funding guarantee.
Property Tax Exemptions
Property tax exemptions are generally the most reliable incentive to verify — they’re written into state statute or county ordinance and don’t depend on annual funding. The main questions are whether your state offers one, whether your county applies it, and whether there’s an expiration date on the exclusion.
How to verify:
- Search your state legislature’s website for the relevant statute (search “[state] solar property tax exemption statute”)
- Confirm with your county assessor’s office that the exemption applies in your jurisdiction
- Note any sunset dates — California’s Active Solar Energy System Exclusion, for example, applies to systems completed before January 1, 2027
Most property tax exemptions are automatic — your assessor won’t raise your assessed value based on solar panels, and no application is required. But confirming this takes five minutes and protects you from a surprise bill increase.
Your 30-Minute Verification Checklist
Before signing any solar contract, work through this list. Every item has a primary source you can check today.
Before you start: Get a written copy of every incentive your installer claims you’ll receive, with the program name, administering organization, dollar amount, and the basis for the figure.
Step 1 — Build your list (5 minutes) Go to dsireusa.org, enter your zip code, and filter for solar incentives. Note every program your installer mentioned. Flag any programs that appear on DSIRE but weren’t mentioned in your quote.
Step 2 — Verify state tax credits (5 minutes) Go to your state’s Department of Revenue website. Search for the tax credit by name. Confirm the current rate and cap. Note the form you’ll need to file.
Step 3 — Check utility rebate status (5 minutes) Go directly to your utility’s website. Find the rebate program by name. Check current status. If the page is outdated, call and ask.
Step 4 — Verify your net metering rate (5 minutes) Pull the current tariff schedule from your utility’s website. Identify the export credit rate structure. Ask your installer what rate they used in their savings calculation and verify it matches.
Step 5 — Check battery rebate funding (5 minutes) If a battery rebate is part of your quote, go to the program administrator’s page and check current funding availability. For waitlisted programs, ask your installer whether your payback calculation assumes you receive the rebate or not.
Step 6 — Confirm property tax treatment (5 minutes) Search your state’s exemption statute. Confirm with your county assessor if needed. Note any expiration date.
Step 7 — Flag anything that doesn’t check out If an incentive your installer quoted can’t be verified against a primary source, ask them to show you the source. A reputable installer will have it. If they can’t provide it, treat that incentive as unconfirmed in your financial analysis.
Frequently Asked Questions
How often do solar incentives change? It depends on the type. State tax credits are relatively stable — they’re set by legislation and typically change only when the legislature acts. Utility rebates and production-based programs can change more frequently, sometimes quarterly, and funding can be exhausted mid-year without notice. Net metering rates are subject to PUC proceedings that can take months or years but result in significant changes when finalized. The safest assumption is that any specific number you find online should be verified before you rely on it.
What’s the most reliable source for solar incentive information? For finding what programs exist: DSIRE. For current program status and rates: the administering organization’s primary page — state energy office, utility website, or program administrator. For regulatory changes to net metering and tariff rules: your state’s PUC docket database. No single aggregator or comparison site can match the accuracy of primary sources, because primary sources update in real time and aggregators don’t.
How do I know if a rebate program has run out of funding? Go to the program administrator’s page and look for a program status indicator. Many programs display “Open,” “Waitlisted,” or “Closed” explicitly. For programs that track funding in real time (like SGIP’s metrics page at selfgenca.com), current funding availability is updated nightly. If a program page doesn’t show current status, call the administrator directly — that’s a five-minute phone call that can save you significant miscalculation.
What happens if an incentive expires after I’ve already signed a contract? Contracts typically make the homeowner responsible for verifying incentive eligibility — not the installer. Read your contract carefully for language about incentive guarantees. If an installer is guaranteeing a specific rebate amount, get that guarantee in writing, including what happens if the program is unavailable at the time of installation. For programs with waitlists, confirm whether your payback calculation assumes you receive the rebate immediately or after a waiting period.
Can I trust the incentive estimates in my solar quote? Solar quotes are typically prepared by sales representatives, not program administrators. A representative may be working from training materials, previous quotes, or third-party databases that haven’t been updated. That doesn’t mean the numbers are wrong — but it means you should verify them independently. Reputable installers will point you to primary sources when asked. If yours can’t, that’s useful information.
Last verified: March 2026. Program statuses and incentive details change frequently. Always confirm current availability at primary sources before making any financial decisions.
Exspenditure.com is an independent site. We are not affiliated with any solar installer, utility, or incentive program administrator.