Commercial Solar PPA vs. Direct Purchase vs. Capital Lease vs. C-PACE in California

The Deadline That Overrides Every Financing Decision

OBBBA rewrote Section 48E for solar and wind on a hard countdown. Facilities that began construction by early July 2026 keep the old glide path — placed in service by December 31, 2030, subject to normal adders and restrictions. The exact cutoff date is contested among advisories: ICS Tax and McGuireWoods put it at July 4, 2026 (one year from OBBBA's July 4, 2025 enactment), while Holland & Knight computes it as July 3, 2026 under a different counting convention. Either way, that start-construction window has already closed as of today — if your project's start date falls in that one-day gap, confirm the applicable cutoff with a tax advisor before relying on it. Anything beginning construction now falls under the harder rule: placed in service by December 31, 2027, or the credit is zero. There's no multi-year phase-down cushion the way geothermal, storage, and some other clean-electricity technologies get through the early 2030s — for solar and wind, the credit just ends.

For a 100kW-2MW commercial rooftop project, that's roughly 16 months of runway from today, once you account for permitting, Rule 21 interconnection review, and equipment lead times. Whichever financing structure you choose, whoever owns the system for tax purposes needs to hit that in-service date to get anything. If your realistic timeline runs past 2027, don't build your decision around a 30% credit that won't exist when the system goes live — price the project on its own economics instead.

Getting to the Full 30% — and Why the Safe Harbor Got Harder

The base 48E rate is 6%. The full 30% requires meeting prevailing wage (Davis-Bacon rates for all construction, alteration, and repair labor) and apprenticeship requirements (at least 15% of labor hours from registered apprenticeship programs) — but projects under 1 MW AC are automatically deemed to meet these and get the full 30% regardless. That carve-out covers most commercial rooftop systems; above 1 MW AC, the full 30% depends on documenting actual compliance, or the credit drops back to the 6% base rate.

Establishing a construction-start date also got harder. IRS Notice 2025-42 (August 15, 2025) eliminated the 5% cost safe harbor for all wind projects and for solar above 1.5 MW AC. Only solar facilities of 1.5 MW or less that began construction before July 5, 2026 could still use the 5% safe harbor — a window that has now closed. Any commercial project starting construction today has to establish beginning-of-construction status through the "physical work of a significant nature" test instead, a higher documentation bar than writing a 5% deposit check.

A separate sourcing rule also applies: for construction beginning in 2026, at least 40% of system component value must come from non-prohibited-foreign-entity sources, rising 5 points a year toward 60% by 2030, and no specified or foreign-influenced entity can claim 48E at all. This is set by Treasury/IRS Notice 2026-15 (Feb. 2026) implementing OBBBA's material-assistance cost-ratio rule. Ask your EPC for component sourcing documentation before signing anything.

Direct Purchase — You Own the Tax Benefits, and the Risk

Buy the system outright and you claim the 48E credit directly, plus 100% federal bonus depreciation — restored permanently, with no phase-down, by OBBBA for property acquired after January 19, 2025. That lets you expense the entire depreciable basis at the federal level in year one. OBBBA also repealed solar's special 5-year MACRS classification under IRC §168(e)(3)(B)(vi) for construction beginning after December 31, 2024, pushing the equipment onto a longer standard recovery schedule — industry commentary puts the replacement at roughly 20 years or more, though we could not confirm an exact replacement class life against primary IRS guidance, so treat that specific number as directional rather than settled. It's mostly academic anyway: once you're taking 100% bonus depreciation, the whole basis is gone in year one regardless of which class life it would otherwise fall under.

California doesn't conform to federal bonus depreciation, though. You'll still be depreciating the asset on a normal schedule for state tax purposes, so talk to your CPA about the add-back before assuming the federal bonus depreciation number is your total benefit. Direct purchase only pays off if your business has enough taxable income to use both the credit and the depreciation the year the system is placed in service — a business with thin or negative taxable income leaves both on the table.

PPA — Someone Else Owns the Tax Benefits, You Buy the Output

Under a PPA, a third-party developer or financier owns the system, claims the 30% credit and depreciation, and passes some of that value through in the per-kWh rate. That's the mechanism that makes PPAs the default choice for nonprofits, schools, and any business without enough tax liability to use a credit directly — you can't waste a benefit you were never going to use.

Reported commercial PPA pricing runs $0.08-0.18/kWh at signing, though that figure is aggregator-sourced and may skew toward larger utility-scale deals rather than true on-site commercial rooftop contracts — ask any provider for a comparable, currently signed California commercial rate sheet before treating it as a benchmark. Escalators of 1-3% annually are standard; get a fixed percentage or a defined calculation method written into the contract, not open-ended language. Buyout options typically show up at years 5, 6, or 7, and again at 10, 15, or 20 — push for a fixed-price schedule or a defined formula rather than "fair market value," since FMV at exercise time is a negotiated number, and you're rarely negotiating from strength years into a contract you didn't originate.

Capital Lease — Debt in Substance, and Now Debt on the Balance Sheet Too

Under ASC 842, a lease classifies as a finance lease (the current term for what used to be called a capital lease) if it trips any one of five tests — the one that matters most for solar is a purchase option your business is reasonably certain to exercise, which describes most solar capital leases with a bargain buyout built in.

Here's what changes the pitch: under ASC 842, unlike the prior ASC 840, both finance leases and true operating leases now go on the balance sheet as a right-of-use asset and a matching lease liability. The old "keep it off the balance sheet" sales argument for solar leases mostly disappeared when ASC 842 took effect in 2019. What's left is an income-statement difference — a finance lease books separate interest and amortization expense, front-loaded like a term loan, while a true operating lease would show one smoother, straight-line expense. Because most solar leases carry a bargain purchase option, they classify as finance leases regardless of what the contract is titled. Budget for it as debt, because your auditor will treat it as debt.

C-PACE — Financing Tied to the Property, Not the Business

Commercial PACE is active statewide in California through CSCDA's Open PACE and CaliforniaFIRST programs, with participating jurisdictions across dozens of counties — confirm current participation with a named administrator rather than treating any county count as fixed. The financing repays as a voluntary benefit assessment on the property tax bill, typically over 10-25 years, and the assessment transfers to the next owner on sale. That's the feature that separates C-PACE from every other structure here: you're financing against the property, not your business's credit.

Rates run roughly 5-7% by the figure this site has used previously, though other C-PACE sources cite a wider 5-10% band; rates are lender-specific and move with the broader rate environment (the 10-year Treasury sat around 4.53% in June 2026), so get a live quote rather than budgeting off a published range. One active administrator's underwriting box: new construction and rehab capped around 30% loan-to-value, retrofit around 35%, combinable with a mortgage up to 90-95% total loan-to-cost — that's one lender's box, not state law, and other administrators may set different caps. C-PACE is not available for single-family residential, condos, or government-owned buildings.

What Changes the Math: System Size, Utility, and the Battery Question

Installed cost scales hard with size: small commercial (25-100kW) runs $1.80-2.55/W, mid-size (100-500kW) $1.40-1.90/W, and large rooftop (500kW-2MW) $1.10-1.50/W, with a California commercial average near $1.72/W and pricing dropping below $1.50/W at scale — industry-reported figures, not a CSLB or CEC dataset.

If your business sits on PG&E, SCE, or SDG&E, you're on the Net Billing Tariff, approved by the CPUC December 15, 2022 and effective April 15, 2023, with export credits around $0.05-0.08/kWh — down roughly 75% from NEM 2.0's near-retail rate. Commercial customers don't get the low-income "ACC Plus" adder some residential customers get, so there's no upside path, which is why pairing a battery to shift self-consumption rather than export now pencils out on nearly every commercial system. The narrow safe-harbor window that let customers who filed a NEM 2.0 interconnection application before the April 14, 2023 NBT cutover still finish construction and lock in NEM 2.0 has now closed — Permission to Operate was required by April 15, 2026. That path is unavailable for any new project signing today; it does not affect customers already grandfathered into NEM 2.0, who keep those terms for 20 years from their original interconnection date regardless.

None of this applies if your business sits on a publicly owned utility. LADWP, SMUD, MID, Anaheim, Roseville, Lodi, Imperial Irrigation District, and Turlock Irrigation District set their own terms and aren't subject to CPUC net billing rules at all. On the storage-incentive side, SGIP covers commercial battery storage, but as of today (2026-09-05) we could not confirm current commercial general-market budget status — residential general-market SGIP is waitlisted, which doesn't necessarily mean commercial sits in the same place. Check selfgenca.com directly before assuming a rebate is available.