Under Order No. 898 companies are required to adopt a new Energy Storage utility function on a prospective basis as of January 1, 2025, and retire legacy accounts for Energy Storage assets and O&M expenses as of that date. Since some schedules on the 2025 FERC Form No. 1 present “Electric Plant in Service” and “Electric Operations and Maintenance Expense” on a comparative basis, the retiring of the legacy accounts will cause temporary misalignment of prior-period (2024) subtotals for the 2025 FERC Form No. 1.

Utilities with energy storage operations with balances in storage asset or expense accounts as of December 31, 2024, will not be able to report these balances in the same lines in the 2025 FERC Form No. 1. Since Order No. 898 has removed certain accounts, FERC staff is aware that the subtotals affected by the removed accounts will not mathematically agree to the sum of their components for the previous year’s columns of these schedules. These cases should be explained in a footnote (for example, noting what the amount was in the deleted account as of December 31, 2024).

For FERC Form No. 1 validation rule considerations, please visit the Taxonomy History webpage at ferc.gov. and refer to Form 1 Version 2025-04-01. Also, note the following:

• Rule F1.204.1 will not be affected, because the validation currently only performs a row-wise checksum.
• Rule F1.320.1 has been updated in the eForms environment to validate only Current Period elements. This is a modification of the version of the validation rule exposed in the 2025-04-01 taxonomy package.

Staff encourages filers to submit nonpublic, unofficial test filings to verify their XBRL instance files against the current eForms validation and rendering code.

Source:

eForms Refresh (ferc.gov)