Off-grid solar is legal in California. No state law forces a home to connect to the utility grid, and California’s building code expressly allows dwellings to run on their own power. What “legal” means in practice is that you’ll pull a building permit, install equipment that meets the state’s electrical and fire codes, use a licensed contractor, and work within local zoning and, if applicable, HOA rules. The rules vary by county and city, but the right to power your home with your own panels and batteries is well established.
Your Right to Go Off-Grid Under California Law
California’s regulations for owner-built rural dwellings state that no dwelling “shall be required to be connected to a source of electrical power, or wired, or otherwise fitted for electrification” beyond minimal safety provisions.1Legal Information Institute. Cal. Code Regs. Tit. 25, Section 130 – Electrical Requirements Counties in solar-heavy regions have embraced this. Nevada County, for example, notes that off-grid solar provides “greater flexibility” for homes in remote areas where extending commercial power is unavailable or prohibitively expensive.2Nevada County, CA Community Development Agency. Off-Grid Solar
Your right to install solar is also protected against private restrictions. Under the California Solar Rights Act (Civil Code Section 714), any deed restriction, covenant, or HOA rule that effectively prohibits a solar energy system is void and unenforceable.3California Legislative Information. California Civil Code Section 714 The statute targets private restrictions rather than government codes, but it signals how deeply the right is embedded in state law.
Permits and Inspections
You need an approved building permit before you start construction on any off-grid system.4Santa Cruz County. Off-Grid Solar Requirements Applications go to your local city or county building department, and that’s where most of the regulatory work happens.
A typical off-grid application asks for:
- A load calculation showing expected household electricity use, used to size the system.
- Solar array plans with panel layout, mounting details, and wiring diagrams that meet the current California Electrical Code.
- A shading report analyzing solar access at the site.
- Battery specifications, including discharge capacity, manufacturer data sheets, and safety certifications.
- Generator plans, if you’re including a backup, covering the transfer switch and fuel pad.
- A site plan showing equipment placement and setbacks from structures and property lines.
All equipment must be listed by UL or another nationally recognized testing laboratory.4Santa Cruz County. Off-Grid Solar Requirements
After installation, the building department inspects the work before signing off. Some jurisdictions do a pre-inspection to check roof penetrations and structural connections before everything gets closed up. The final inspection covers panel placement, mounting, wiring, grounding, labeling, and firefighter access against the approved plans. Scheduling and turnaround vary widely by jurisdiction. Permit fees are capped by state law and typically run a few hundred dollars, scaling somewhat with system size.
Building Code and Electrical Standards
Off-grid systems must meet the California Building Standards Code (Title 24), which incorporates an amended version of the National Electrical Code. The 2025 edition took effect for permit applications filed on or after January 1, 2026.5California Energy Commission. 2025 Building Energy Efficiency Standards Applications filed earlier fall under the prior cycle.
The California Electrical Code (Part 3 of Title 24) governs the wiring and safety details: overcurrent protection, grounding and bonding of the array and racking, conductor sizing, and disconnects.6California Department of General Services. 2025 Title 24 California Code Changes Article 690 covers solar PV, and standalone systems have their own design considerations because there’s no utility transformer to reference for grounding. Whoever designs your system needs to know how off-grid installations differ from grid-tied ones on this point.
Structural rules apply to mounting. Roof-mounted arrays can’t compromise the roof, and ground-mounted systems need footings appropriate for local soil and wind. If the installation changes the structural load on an existing building, the department will want engineering calculations.
Battery Storage and Fire Code
Nearly every off-grid system needs a battery bank, and battery rules tightened in the 2025 code cycle. The 2025 California Fire Code (Part 9 of Title 24) replaced earlier storage provisions with expanded rules for all battery types, with particular attention to lithium-ion and lithium-metal systems.6California Department of General Services. 2025 Title 24 California Code Changes
Outdoor batteries installed near a residence generally have to sit at least five feet from other structures and at least three feet from doors, windows, HVAC inlets, and other openings into living spaces. Indoor batteries are typically restricted to garages, and an attached garage installation must be separated from living and sleeping areas by a fire-rated barrier.
If your property sits in a designated Wildland-Urban Interface zone, expect extra scrutiny. Local fire authorities in WUI areas may require additional vegetation clearance around ground-mounted equipment, fire-resistant enclosures, or limits on battery chemistry. Talk to your local fire marshal before you finalize the design if you’re in a fire-prone area.
Zoning and HOA Rules
A building permit doesn’t override zoning. Local rules govern where on your parcel the panels, batteries, and inverters can go: property line setbacks, height limits for ground-mounted structures, and lot coverage caps that limit how much of the parcel can be covered by structures. These vary by jurisdiction and zoning district.
In a community governed by an HOA, Civil Code Section 714 does most of the heavy lifting for you. An HOA can impose “reasonable” restrictions, but the law defines the term narrowly. For photovoltaic systems, a restriction is unreasonable if it adds more than $1,000 to total system cost or reduces efficiency by more than 10 percent.3California Legislative Information. California Civil Code Section 714 An HOA that willfully violates these protections faces liability for actual damages plus a civil penalty of up to $1,000.
In common interest developments, the HOA cannot adopt a blanket ban on rooftop solar on the building where you live or on a garage or carport assigned to you, and it cannot require a full membership vote to approve your installation. It can require your installer to carry insurance and indemnify the association, and it can regulate installations in common areas.
Disconnecting From the Utility
A true off-grid system has no physical connection to the utility. No monthly bill, no net metering credits, and no backup if the batteries run low. If your property currently has service and you want to disconnect, you contact the utility to request permanent termination.
Watch for one catch. Customers classified as “departing load” who leave bundled utility service for self-generation may continue to owe non-bypassable charges even after they stop taking electricity. These fund public programs and legacy costs regulators have decided all customers share, including nuclear plant decommissioning, public purpose programs, and competition transition costs.7PG&E. Departing Load The per-kilowatt-hour amounts are small, but they can catch you off guard if you assumed off-grid meant zero utility contact.
Who Can Install the System
California requires off-grid solar to be installed by a licensed contractor or a “qualified person” under the California Electrical Code.2Nevada County, CA Community Development Agency. Off-Grid Solar In practice, that means a contractor holding either a C-46 (Solar Contractor) or C-10 (Electrical Contractor) license from the Contractors State License Board. A C-46 licensee installs, modifies, maintains, and repairs thermal and photovoltaic solar energy systems.8Contractors State License Board. C-46 – Solar Contractor – Licensing Classifications Detail
Residential off-grid systems must be designed by a licensed solar contractor. Commercial off-grid projects typically need a licensed electrical engineer to sign off on the design.4Santa Cruz County. Off-Grid Solar Requirements Experience matters here. Off-grid design involves load calculations, battery bank sizing, charge controller programming, and generator integration that grid-tied jobs skip. A contractor who mostly does grid-tied work can undersize your batteries or misconfigure your charge controller, and you’ll find out on a cloudy winter day.
Tax Treatment and Incentives
The federal Residential Clean Energy Credit, which covered 30 percent of solar and battery storage costs, expired for systems placed in service after December 31, 2025.9Internal Revenue Service. Residential Clean Energy Credit The statute confirms no credit applies to expenditures made after that date.10Office of the Law Revision Counsel. 26 USC 25D Systems placed in service in 2025 can still claim the credit on the 2025 return. Installations in 2026 cannot.
California’s own break is more durable. Under Revenue and Taxation Code Section 73, installing an active solar energy system does not trigger property tax reassessment. Panels, batteries, inverters, and related equipment are excluded from “new construction” for property tax purposes, so your bill won’t rise because of the installation.11California State Board of Equalization. Active Solar Energy System Exclusion The exclusion is scheduled to sunset on January 1, 2027, so systems installed in 2026 still qualify.12California Legislative Information. California Revenue and Taxation Code 73
The CPUC’s Self-Generation Incentive Program offers rebates for qualifying battery storage. General residential categories had funding through 2025, but a separately funded Residential Solar and Storage Equity budget of $280 million offers $1,100 per kilowatt-hour of storage capacity for qualifying low-income households.13California Public Utilities Commission. Self-Generation Incentive Program Eligibility depends on income and other criteria, and funds are first-come, first-served, so check with your utility’s SGIP administrator for current availability.