California’s solar property-tax exclusion sunsets January 1, 2027 — systems must be completed, not just started, to qualify.
Leading Commercial Solar Provider in California
California’s commercial electricity rates are the highest in the nation. Plankton designs for the Net Billing era — self-consumption first, storage where it pays — generating electricity and net operating income with idle rooftop and parking lots into electricity and net operating income.
60,000+
140+
720,000+
OUR TRACK RECORD
California Experience, National Scale
Our San Diego project — 1,462 kW on a San Diego student-housing community — anchors Plankton’s California work, backed by an operating portfolio built across the country.
San Diego, CA
- 485 kW rooftop solar system
- $4M in projected savings
- 5,900+ lifetime metric tons CO2 reduced
Commercial Office Park
Newton, MA
- 1,798 kW rooftop + carport system
- 20-year Power Purchase Agreement
- 29,800+ lifetime metric tons CO2 reduced
Industrial Facility
Camden, NJ
- 972 kW hybrid rooftop + canopy
- $2.5M electricity savings (25 years)
- 9,640+ lifetime metric tons CO2 prevented
Serving Commercial Properties Across California
Commercial-scale solar (100 kW to 1 MW+) across SDG&E, Southern California Edison, and PG&E territories — San Diego, greater Los Angeles, Orange County, the Inland Empire, the Bay Area, Sacramento, and the Central Valley. Warehouses, retail, office parks, multifamily and student housing, schools.
Have 10,000+ sq ft of available rooftop or 25,000+ sq ft of parking? We can model it.
California Solar Economics & Financial Levers
California’s case rests on rules and rates, not rebates: the nation’s highest prices, demand charges, Net Billing, and a property-tax exclusion with a hard sunset. Details current as of mid-2026.
California programs & rules
- Property-tax exclusion (R&T §73): zero added assessed value — sunsets Jan 1, 2027; systems must be COMPLETED by then
- Net Billing (NEM 3.0): exports earn avoided-cost rates — size for self-consumption first
- SGIP storage funding: limited steps and waitlists by utility — we verify live status before quoting
- SDG&E, SCE & PG&E tariffs top the nation, and demand charges compound them
Tax & ownership levers
- Bonus depreciation front-loads a major deduction, with five-year MACRS on the balance
- A PPA or site lease puts tax benefits where they're usable — value returned as pricing or rent
- Solar + storage shifts midday output into peak windows and shaves demand charges
Commercial Solar Financing Options
We finance, build, and operate on your property and sell you output below SDG&E, SCE, or PG&E tariffs — 15–25 years of rate insulation, no capital cost.
Turn a roof, parking field, or parcel into ground rent — we develop and operate while you collect predictable lease payments.
Own it: take the depreciation, keep every avoided utility dollar, and — if completed before the Jan 2027 sunset — lock the property-tax exclusion.
Why Smart California Property Owners Choose Commercial Solar
Beat the Nation’s Steepest Rates
California commercial tariffs top the U.S., with demand charges stacked on top — self-consumption solar flattens both for 20+ years.
Add Income the Asset Keeps
Avoided utility spend, lease rent, or PPA savings land in NOI monthly — and capitalize directly into valuation at refinance or sale.
Build to Where California Is Going
The building code already mandates solar on much new commercial construction, and the grid is legislated toward 100% clean by 2045.
Solar Installation Options For California Properties
Rooftop
The lowest-cost path for buildings with 10,000+ sq ft of open flat roof — sized to daytime load, roof warranty safeguarded.
Parking Canopy
California parking lots are generation sites waiting to happen: 25,000+ sq ft becomes power plus shaded spaces tenants notice.
Solar + Storage
The Net Billing-era configuration: batteries move midday production into peak windows and shave demand charges.
California Commercial Solar — Frequently Asked Questions
Less rebate, more rule. California’s case is built on the nation’s highest commercial electricity rates and demand charges, a Net Billing tariff that rewards using your own production, a property-tax exclusion on added system value that sunsets January 1, 2027, and accelerated depreciation for owners. There’s no broad state rebate or sales-tax exemption to chase — the return comes from designing correctly against your tariff and completing on the right timeline.
For systems interconnected since April 2023, exported power earns avoided-cost rates — a fraction of retail — rather than one-for-one credit. That changes design, not viability: we size arrays to your load profile so production is consumed onsite at full retail value, and add storage where shifting energy into peak windows pays. Oversized, export-heavy systems are a legacy strategy; load-matched systems still deliver strong returns at California rates.
Under Revenue & Taxation Code §73, a qualifying solar installation is excluded from property-tax assessment — the system adds taxable value of zero. The exclusion sunsets January 1, 2027, and per Board of Equalization guidance a system must be completed by that date; being under construction is not enough. Unless the legislature extends it, systems finished after the deadline face assessment on the added value, so completion timing belongs in the financial model from day one.
Under Net Billing, storage usually earns its place: it moves midday solar into expensive peak hours and cuts demand charges, the costliest line on a California commercial bill. SGIP incentives for batteries still exist but sit in limited steps and waitlists that vary by utility and budget category — so we verify live funding before it enters your numbers, and we model the storage case on tariff savings alone so the decision doesn’t hinge on a rebate.
The three investor-owned utilities — SDG&E, Southern California Edison, and PG&E — where our San Diego student-housing project already produces in SDG&E territory. Municipal utilities such as LADWP and SMUD run their own tariffs and programs, and territory follows the meter rather than the ZIP code, so confirming yours is step one of feasibility.
Plankton is a turnkey commercial solar developer and long-term owner-operator working coast to coast. One team handles origination, engineering, interconnection, procurement, construction, and commissioning — then operates and maintains the system for decades. Our California work runs on the same model that built our East Coast portfolio: we own what we build, so our incentives track yours.
Physically: 10,000+ square feet of open, structurally sound flat roof or 25,000+ square feet of parking. Economically: meaningful daytime load — distribution and cold storage, grocery-anchored retail, office parks, multifamily and student housing, schools, houses of worship. Owners planning new construction should note California’s code already requires solar on many new commercial buildings; existing buildings can get there on better terms by choosing their moment.
Design life runs 25+ years, matching the manufacturer warranties on panels and inverters. Plankton is the operator, not just the installer: the organization that engineered your system watches its production data, services the hardware, and handles program compliance for the full term of the agreement.
The array and the membrane need to retire together, so we look for roughly 20 years of remaining roof life before building. If your roof is short of that, a replacement can often be rolled into the project — and in California, bundling it can help the system reach completion before the property-tax exclusion sunsets.
One hard date and several soft ones. The property-tax exclusion requires completed systems by January 1, 2027 — and a commercial project needs design, permitting, interconnection approval, and construction before then, so the realistic start window is now. Beyond that, SGIP steps decline as budgets draw down, interconnection queues add months, and every billing cycle at California rates is unhedged spend. Feasibility is free and starts the clock in your favor.