Three structural changes hit California solar economics in the first half of 2026. None of them got the press they deserved, but all three change the math materially for anyone evaluating a project right now. This piece walks through each one, what it means for buyers, and what we're telling our own clients to do about it.
Change #1: The residential ITC expired on December 31, 2025
This is the headline that should have run on the front page of every California real estate weekly and didn't. The 30% federal Residential Clean Energy Credit (Section 25D) expired at the end of 2025. There is no 30% federal credit for a homeowner-purchased residential solar system installed in 2026 or later. Not a phase-down. A cliff.
This is a real change, and you'll see industry articles still showing 30% because they were written before the law changed. The IRS guidance for the 2026 tax year is the authoritative source, and it is unambiguous: 25D credits ended at year-end 2025.
- Commercial solar: under IRS Notice 2025-42, projects that begin construction after July 4, 2026 must be placed in service by December 31, 2027 to qualify for Section 48E; earlier starts are assessed under the beginning-of-construction and continuity rules. The 30% rate is not automatic (6% base unless prevailing-wage and apprenticeship requirements or an exception apply). (Updated October 10, 2026.)
- Energy storage is not subject to the July 2026 solar deadline, but must meet the other Section 48E requirements, including foreign-entity sourcing rules for projects beginning construction after 2025.
- Third-party-owned residential (leases and PPAs) continues to qualify under the commercial framework. If your contractor owns the system and sells you the power, the credit flows to them — and they typically price the offer to share the benefit.
Implications for homeowners: if you were evaluating a customer-owned residential system on the basis of "30% off via tax credit," your model is now stale. The system still pencils out in most California rate environments — but you have to look at the new math without the federal anchor. We'll get to that math below.
Change #2: PG&E restructured residential rates in March 2026
Under California's AB 205, PG&E rolled out an Income Graduated Fixed Charge (IGFC) in March 2026. For typical-income residential customers this added a flat ~$24/month base services charge to the bill, paired with a per-kWh reduction of roughly $0.05–$0.07/kWh on the variable rate.
The net effect depends entirely on usage. If you're a low-volume household (under ~300 kWh/month), the fixed charge dominates and your total bill is up. If you're a high-volume household, the per-kWh cut dominates and your total bill is down. The CPUC's stated rationale was bill equity across income levels and a more honest separation between grid-infrastructure costs and energy consumption.
What this means for solar economics: the per-kWh rate is now lower, which slightly lowers per-kWh solar savings. But it doesn't change the picture as much as you might think — PG&E's E-TOU-C summer peak rate still runs roughly $0.45–$0.50/kWh, with off-peak around $0.35–$0.38/kWh, so the absolute peak-to-off-peak spread that batteries arbitrage remains substantial.
Change #3: NEM 3.0 is now fully mature and predictable
California's Net Billing Tariff (the third iteration of net energy metering, hence "NEM 3.0") has been live since 2023, but 2026 is the first full year where the market has internalized what it actually means. The headline number — exported solar gets compensated at the Avoided Cost Calculator (ACC) rate, averaging $0.04–$0.08/kWh versus the $0.30–$0.64/kWh you'd save by self-consumption — is now well-understood.
What changed in 2026 isn't the policy itself, but the design response. Two years of post-NEM-3.0 installations have made it abundantly clear that battery-paired systems are the only configuration where the math works for typical residential loads. Solar-only systems are no longer something a competent installer should be proposing for a standard rate-payer.
The new math for a typical California residential project
Here's what a representative single-family home in Marin or the East Bay looks like under 2026 conditions. Numbers are illustrative — the right ones for your specific property will come from a real evaluation.
| Line item | Number |
|---|---|
| System size | 8.5 kW solar + 13.5 kWh battery |
| Gross system cost | ~$36,000 |
| Federal credit (residential, customer-owned) | $0 |
| California state incentives (SGIP, local) | varies |
| Net installed cost (no federal credit) | ~$32,000–34,000 |
| Year-1 bill savings (PG&E E-ELEC + battery arbitrage) | ~$3,200–4,000 |
| Simple payback | ~8–10 years |
| 25-year IRR estimate | 6–9% |
That's not the 14% IRR of 2023, and we're not going to pretend it is. But ~7% IRR with no market correlation, no manager fees, and a 25-year asset life is still better than most of what's on offer for the same after-tax dollar in 2026. The pitch we make to residential clients now is honest: solar is no longer the no-brainer it was three years ago, but for a buyer who plans to stay in their home five or more years, the math is still firmly on the right side of the line.
What to do about it
If you're a homeowner
Re-run the math on any prior quote you have. If your installer hasn't updated their model since 2024, the quoted IRR is wrong. Insist on E-ELEC-aware modeling and conservative export assumptions (~$0.06/kWh average). A solar-only system without a battery should not be on the table.
If you're a commercial property owner
Update, October 10, 2026: the July 4, 2026 construction-start date has passed. Commercial solar that begins construction now must be placed in service by December 31, 2027 to qualify for Section 48E, and the credit’s effect on returns depends on rate, eligibility and tax position. See our updated federal credit guide.
If you're a property owner with multi-tenant exposure
The Monetize Rooftop economics (selling solar to your tenants below the utility rate) are unaffected by the residential credit change — they run on the commercial framework. See our PAG case study for the model in action.
The honest summary
Solar economics in California in mid-2026 are not as good as they were in 2024. They are not as bad as the breathless coverage of the ITC expiration suggests. They are differently structured — with a clearer winning configuration (solar + battery), a more demanding payback window, and a sharply different decision tree depending on whether you're a residential, commercial, or property-owner buyer.
The right call right now is to model your specific project against current conditions. If a contractor is still quoting against 2024 assumptions, find a different contractor.
Want to model your specific project against 2026 conditions?
We'll build an honest financial model for your property — using current rates, current credits, and current export assumptions. No obligation.
Request a Free Evaluation →