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CARB staff propose Excel-only submissions, 30 MB appendix limit and revised 'unusual/large leak' definition for 2026 NGLA reporting
Summary
CARB staff proposed limiting appendix files to 30 MB, requiring Excel spreadsheets instead of PDFs, removing the 24-hour requirement from the Appendix 8 unusual/large leak definition, and noted October 2025 changes to Appendix 9 emission factors; staff set March 31 template issuance and June 15 reports due.
CARB staff outlined proposed changes to the 2026 Natural Gas Leak Abatement (NGLA) reporting template, including file-format and size limits and revisions to how utilities may designate events as "unusual or large" for year-over-year emission analyses.
Andrew Maroka of the California Air Resources Board told attendees the agency will request that each appendix submission be limited to 30 megabytes and submitted as an Excel spreadsheet rather than a PDF, though staff said utilities may petition staff for exceptions if they have special circumstances. "We request the file size per appendix submittal be limited to 30 megabytes," Maroka said.
Why it matters: CARB staff said oversized or non-editable files have impeded internal review and data transfers. The Excel…
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