What changes next for inverters and power control systems in California?

The 2026 NEC is in development for January 1, 2029. The next IECC edition is in development for January 1, 2029.

Which California laws name inverters and power control systems?

Electric Rule 21 Section Hh is in force or enacted.

What applies to my job?

Pick the state and the product you build, install, or inspect. The card below answers from each state’s own record.

State

Inverters and power control in California

Which codes apply? In California, inverters and power control systems fall under the 2023 NEC and the state’s own code in place of the IECC residential.

The inverter, the power control system, and the interconnection to the grid. State record read Oct 18, 2026. Data as of Oct 26, 2026.

Codes that reach inverters and power control systems

The edition California enforces for each code that governs the product, and the part of the code that does.

NECNational Electrical Code

2023 NECVerified

in force since Jan 1, 2026

Where it reaches the product. Article 705, interconnected power sources, with 690 and 706 for the source and the listing the inverter must carry.

2025 California Electrical Code · Cal. Code Regs., tit. 24, pt. 3

The 2026 NEC is in development for January 1, 2029.

The California NEC record
IECC residentialInternational Energy Conservation Code, residential

State’s own codeVerified

Where it reaches the product. Where a state adopts the solar-ready or storage-ready appendix, the space and the conduit the inverter needs.

2025 California Energy Code · Cal. Code Regs., tit. 24, pt. 6

The next IECC edition is in development for January 1, 2029.

The California IECC residential record

Coming next

NEC
The 2026 NEC is in development for January 1, 2029.
Commission’s 2027 Triennial Cycle lists adoption of the 2026 NEC.
Verified
IECC residential
The next IECC edition is in development for January 1, 2029.
Energy Commission: ‘Proposed standards will be adopted in 2027 with an effective date of January 1, 2029’ and the timeline is ‘consistent with Assembly Bill 130’; the page does not say how the residential provisions are treated.
Verified

State or local

NECLocal jurisdictions may add amendments by ordinance; since Oct 1, 2025, cities and counties may not adopt new residential amendments through Jun 1, 2031, except under AB 130’s listed exceptions.
IECC residentialLocal jurisdictions may add amendments by ordinance; since Oct 1, 2025, cities and counties may not adopt new residential amendments through Jun 1, 2031, except under AB 130’s listed exceptions.

Cities and counties can amend a statewide code, so confirm the edition in force with the local official.

Go deeper

California laws that name inverters and power control systems

On the site: one law or rule, newest first.

Law or rule	Kind	Stage	Date	What it does
Electric Rule 21 Section HhElectric Rule 21 Section Hh (smart inverter requirements); CPUC D.14-12-035	Tariff	PartialIn force	Sep 8, 2017	Requires inverters on interconnecting distributed resources to perform seven autonomous functions from Sep 8, 2017. Later phases added communication and advanced functions under Rule 21 Section Hh. Source (opens in a new tab)

Every California law on inverters and power control systems, with filters

For information only. Your local building or fire official decides which code applies. We check state records often but can miss a recent change, so confirm with your official before you design, permit, or install. Terms of use