California's rule is now the Regulation for Reducing Greenhouse Gas Emissions from Gas-Insulated Equipment (GIE), Title 17 CCR sections 95350-95359. This guide covers who it applies to, what CARB requires, how to handle leaks, and how phaseout dates affect fleet planning. It is written for utility owners, operators, generating facilities, and substation contractors.
Key Takeaways
- Owning covered gas-insulated equipment triggers CARB duties, with no minimum fleet size.
- The annual limit is mass-based, and a report is due June 1 even in a zero-emissions year.
- Leak repair cuts emissions but never replaces records, calculations, or reports.
- Phaseout dates restrict new SF6 purchases, not existing equipment.
- Verify current CARB forms and deadlines before relying on older summaries.
Who Must Comply With California's CARB SF6 Regulation?
Covered equipment and regulated organizations
The current amended rule took effect January 1, 2022. The 2011 version and its leak-rate schedule no longer apply.
All owners of electrical gas-insulated equipment (GIE) that uses a covered insulating gas are in scope. CARB defines a covered gas as one with a GWP above 1 and sets no minimum fleet size or nameplate threshold. A service contractor does not take over the owner's reporting responsibility.
Typical covered sites include:
- Transmission and distribution substations
- Municipal utilities and rural electric cooperatives
- Generating plants and renewable-energy facilities
- Any other site with qualifying gas-insulated equipment
Applicability screening for utility fleets
Work through this sequence:
- List every California facility and covered asset.
- Confirm who owns or controls each unit.
- Record equipment type, gas, and operating status.
- Check for exemptions or special provisions.
Don't assume EPA status decides applicability. A utility can owe CARB reports without being an EPA Subpart DD reporter. A new recipient of covered equipment becomes its owner, and equipment removed from regular use can stay reportable. Confirm edge cases with CARB.
Related regulatory programs
The GIE rule is legally separate from CARB's Mandatory Greenhouse Gas Reporting Regulation (MRR). Entities subject to MRR file through Cal e-GGRT. Others may use Cal e-GGRT or CARB's form with a signed attestation.
EPA's Subpart DD covers electrical transmission and distribution equipment under 40 CFR Part 98. Subpart SS covers equipment manufacture or refurbishment, not ordinary utility ownership.
What Are the Current CARB SF6 Requirements for Utilities?
Emissions limit and calculation
The limit is mass-based, with a minimum of 50 MTCO2e. For data years 2021-2024 it uses average CO2e capacity; from data year 2025 it uses baseline CO2e capacity.
| Capacity | 2021-2034 | 2035 onward |
|---|---|---|
| 10,000 MTCO2e or more | 1.0% | 0.95% |
| Under 10,000 MTCO2e | 2.0% | 1.9% |
Emissions come from a mass-balance calculation of gas movements and inventory changes. Use the equations in the regulation and CARB's reporting form rather than a rule of thumb. Hermetically sealed equipment is excluded from the calculation.
Records and written procedures
Keep current inventories of equipment and gas containers, with identifiers and capacity data. Keep transaction and service records too: purchases, transfers, additions, removals, and servicing. Reconcile beginning and ending gas inventory each year.
The rule also prescribes written procedures for container tracking and for measurement and calibration. The current rule does not require a separate technician certificate. Retain records for five years under section 95356(b).
Annual reporting
- Data covers the calendar year; the report is due June 1 of the following year
- Data year 2025 reports were due June 1, 2026
- CARB posted the data-year 2025-and-beyond Excel form and instructions in February 2026
- Cal e-GGRT filings are uploaded and certified; other filings need a penalty-of-law attestation from an authorized signatory
- Current instructions do not set a distinct correction deadline, so confirm any correction window with CARB before assuming one
Inspections, enforcement, and penalties
Records must be available for inspection and provided to CARB on request. Penalties arise under Health and Safety Code section 38580, and CARB weighs harm, persistence, and economic benefit.
Recent cases show what draws action:
- Southern California Edison paid $350,000 in 2021 over incomplete inventories and report inaccuracies for 2014-2019, per CARB's settlement.
- Los Angeles Department of Water and Power paid $137,900 in 2025 after reporting violations, covering 197 days at an average $700 per day.
Both cases centered on records and reporting gaps.
How Utilities Can Manage SF6 Leaks and Document Corrective Action
Build a facility-level workflow
Name one compliance owner. Link the asset register, gas inventory, maintenance system, contractor records, leak findings, and the annual submission. Before filing, have maintenance, environmental, operations, and procurement reconcile the same equipment and gas data.
Detect, confirm, and document leaks
A suspected leak is not a confirmed one. Treat them separately in your records.
Traditional detection used soapy water, handheld detectors, or ultrasonic devices, where wind and noise can hurt accuracy. Infrared laser scanning can image an entire breaker. For each leak, log:
- Suspected component and confirmation method
- Initial condition and gas lost or recharged
- Repair date and post-repair verification
These records support the emissions calculation and any corrective-action narrative.
Choose repair, outage, or replacement
Weigh these factors before you commit to a path:
- Leak location, design limits, and OEM requirements
- Safety, equipment criticality, and outage availability
- Age, repair history, and future procurement limits
Sealing a leak, recovering gas, replacing a component, refurbishing, and full replacement are different interventions. Each carries different documentation and approval needs.
Coordinate qualified field work
Don't treat energized work as a universal answer. It depends on equipment, site conditions, utility procedures, and safety requirements. Confirm contractor experience with:
- SF6 breakers and GIS
- Gas handling and recovery
- OEM requirements
- Paperwork you need for regulatory files
Leak-sealing support for SF6 equipment
Transmission & Distribution Services (TDS) works exclusively in substations, sealing leaks on SF6 gas-filled breakers and GIS. Its low-pressure method installs a custom clamp filled with rubber-based sealant, or a cured-in-place gasket, which can avoid disassembly and downtime when conditions permit.
TDS says it offers:
- Free equipment surveys listing location, equipment, leak location, price, and method
- Leak-source confirmation before proposing a repair
- Possible in-service repair, though an outage may be needed for safe clearance
- A four-year leak-seal warranty
Technical repair does not replace CARB reporting or regulatory review.
SF6 Phaseout, Existing Equipment, and Utility Planning
The current phaseout framework
The phaseout is in the rule effective January 1, 2022. It restricts acquiring new SF6 GIE by voltage, short-circuit rating, and date. It does not require removing existing equipment.
| GIE characteristics | Phaseout date |
|---|---|
| Aboveground, under 38 kV | Jan. 1, 2025 |
| Aboveground, 38 kV | Jan. 1, 2028 |
| Belowground, 38 kV or less, under 25 kA | Jan. 1, 2025 |
| Belowground, 38 kV or less, 25 kA or more | Jan. 1, 2031 |
| Over 38 to 145 kV, under 63 kA | Jan. 1, 2025 |
| Over 38 to 145 kV, 63 kA or more | Jan. 1, 2028 |
| Over 145 to 245 kV, under 63 kA | Jan. 1, 2027 |
| Over 145 to 245 kV, 63 kA or more | Jan. 1, 2031 |
| Over 245 kV | Jan. 1, 2033 |
Existing fleet versus new equipment
Exceptions cover equipment reported to CARB or purchased before the applicable date, and manufacturer warranty replacement. Since September 1, 2024, project-based exemption requests may cite no suitable non-SF6 bids, physical fit, compatibility, or documented technical, safety, or reliability limits.
Replacement parts are not phaseout-controlled, but SF6 parts installed on active equipment are reportable. Failure and spare provisions carry 15-day notification and 45-day acquisition reporting.
Evaluating alternatives
CIGRE's 2026 report describes natural-origin gas mixtures, synthetic mixtures, and vacuum interruption. Examples include type testing at 145 kV. That doesn't prove availability for every application. Independent lifecycle and reliability comparisons are hard to find, so request them from OEMs and check them against your duty cycle.
When you evaluate options, compare:
- Voltage class and interrupting rating
- Footprint and maintenance needs
- Gas handling and lifecycle cost
- Supplier support and training
Validate each application with the OEM and your engineers.
A phased roadmap
- Rank assets by leak history, criticality, age, maintenance burden, and outage windows
- Align procurement with the phaseout dates above
- Document exemption and purchase decisions
- Budget for repair or replacement and train personnel
- Track CARB updates and retain decision records
Conclusion and Action Steps
Start with these priorities:
- Determine whether CARB SF6 rules apply to your utility or facility.
- Build a complete inventory of SF6 equipment and nameplate data.
- Reconcile gas records against purchases, transfers, and emissions.
- Confirm reporting dates, thresholds, and required forms.
- Review written procedures for handling, leak response, and documentation.
- Investigate active leaks and plan repairs that keep equipment in service.
- Check phaseout timelines and replacement requirements for covered gear.
Compliance spans environmental, operations, maintenance, engineering, procurement, and technical service teams. For facility-specific questions, consult current CARB materials and qualified legal or regulatory professionals.
Frequently Asked Questions
What are the current CARB regulations in California?
The GIE regulation (Title 17 CCR 95350-95359, effective 2022) sets a mass-based emissions limit, record and procedure requirements, a June 1 annual report, and phaseout dates for new SF6 equipment. Verify details against CARB's current pages.
What is the current status of California SB 261?
SB 261 requires climate-related financial-risk reports from entities with over $500 million in revenue. The Ninth Circuit enjoined enforcement pending appeal in November 2025, and CARB's advisory says it won't enforce meanwhile. It is separate from the GIE rule, and status may have changed.
Who must comply with California's CARB SF6 regulation?
All owners of electrical gas-insulated equipment using a covered gas, with no minimum size. EPA thresholds don't determine CARB applicability.
What records do California utilities need to keep?
Equipment and container inventories, purchases, transfers, servicing, recovery, leaks, repairs, calculations, and reports. Keep them five years.
Does EPA SF6 reporting satisfy CARB requirements?
No. The programs differ in applicability, deadlines, and data. EPA's deadline is generally March 31, while CARB's is June 1. Compare both.
Does California require utilities to replace existing SF6 switchgear?
No. The phaseout restricts acquiring new SF6 equipment after set dates, subject to exceptions. Check current CARB provisions for repairs, modifications, and exemptions.
