The first Scope 1 and Scope 2 reports under SB 253 are due on November 10. For industrial companies, the hard part is not the filing. It is knowing, from plant data, how much fuel and power every site actually used.
California's first corporate emissions reports are now less than seven weeks away, and most of the commentary about them has been written for sustainability teams and finance departments. For industrial companies the deadline lands somewhere else entirely. A Scope 1 number is the fuel burned in boilers, furnaces, kilns and on-site fleets. A Scope 2 number is the electricity and steam a plant buys. Both are, before they are anything else, readings from a meter or a fuel log on the plant floor, and many operations still do not collect them in a form anyone would want to sign off.
The California Air Resources Board approved its initial climate disclosure regulation on February 26. It applies SB 253's emissions reporting to US-based entities with more than $1 billion in annual revenue that do business in California, and SB 261's climate risk reporting to those above $500 million. First-year reporting covers Scope 1 and Scope 2 only, with Scope 3 following in 2027. "By establishing clear and consistent disclosure requirements, California is ensuring that the state's investors and consumers have access to reliable information," said CARB Chair Lauren Sanchez in the announcement.
The original first-year deadline of August 10 did not hold. CARB's guidance of September 1, summarised by counsel on Mondaq, sets November 10, 2026 as the date for Scope 1 and Scope 2 data covering the prior fiscal year, submitted through a voluntary online intake form or by email. The same guidance confirms the board will exercise enforcement discretion for this first cycle. Companies can report on the information they already had or were collecting as of December 5, 2024, can proceed without limited assurance, and, if they were not collecting emissions data at that point, can file a statement of non-reporting on company letterhead.
That relief is real, but it is narrow and it is temporary. It applies to one reporting cycle. CARB is already running a second rulemaking to set the requirements for 2027 and beyond, including accounting methodologies, deadlines, assurance and reporting formats. KPMG's summary of the rules notes that Scope 3 will be phased in across five commonly reported categories, with spend-based, activity-based, supplier-specific or hybrid calculation methods all permitted. A company that files a thin first report this autumn is buying a year, not an exemption.
The trouble for operators is that the systems holding energy data were built to pay bills, not to be audited. Utility invoices arrive monthly and by account rather than by process. Fuel deliveries are logged by purchasing. Sub-metering, where it exists, often stops at the building level, and the numbers that do exist are scattered across a maintenance system, a spreadsheet and the plant manager's inbox. A corporate total can be assembled from invoices, but it cannot easily be traced back to a line, a shift or a piece of equipment, which is exactly the trail an assurance provider will eventually ask for.
The Energy Efficiency Movement's third global survey, published in June and based on 2,000 senior business decision makers across North America, Europe, Asia-Pacific and Latin America, shows how wide the gap is. Energy now accounts for 23% of operating costs, and 54% of respondents say rising energy prices pose a moderate or major threat to profitability. Yet 23% say they do not have sufficient data to justify efficiency investment internally, 29% report a digital skills gap and 31% lack the specialist resource to implement projects. A company that cannot build an internal business case from its energy data is unlikely to have data clean enough for a regulator either.
Cost pressure makes the same point from the finance side. In the National Association of Manufacturers' third-quarter outlook survey, 74.1% of manufacturers cited fuel costs as a challenge and 77.3% cited freight rates, while rising raw material costs topped the list of business concerns for a second consecutive quarter. The measurement that emissions reporting demands is the same measurement a plant needs to find out where that fuel is going. Treated separately, they are two projects fighting over the same meters. Treated together, the reporting obligation can pay for the instrumentation.
Scope 1 and 2 are, at least, inside a company's own fence. Scope 3 is not. When value chain reporting begins in 2027, the large reporting companies will need emissions data from the suppliers, contractors and logistics providers they buy from, and many of those businesses sit well below the $1 billion threshold and have never been asked for it. The permitted spend-based method offers a way to estimate without their cooperation, but supplier-specific data is what a credible report will increasingly rely on.
For industrial firms that supply larger manufacturers, this means the questionnaire will arrive whether or not California's rules technically apply to them. For firms that buy from hundreds of contractors, it means supplier qualification programmes built around safety and insurance will have to carry emissions data as well. Neither group has long to prepare. The Scope 3 categories and methods are being settled now, and the first requests are likely to go out well before the 2027 reports are due.
With the first deadline set and the second rulemaking under way, operations leaders have a short window to turn a compliance filing into a measurement system.
Guide
Real-time fuel and energy monitoring is the same instrumentation a defensible Scope 1 figure depends on, and this guide shows where plants still measure consumption after the fact instead of as it happens.
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Guide
CARB waives assurance for one cycle only, and this guide covers building the continuous, timestamped record that every emissions figure after November will need behind it.
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Report
With Scope 3 reporting arriving in 2027, ESG expectations are moving into supplier relationships, and this report looks at how contractor programmes are being redesigned to carry them.
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