(1) Gas utilities in the state of Washington must use the uniform system of accounts applicable to major and nonmajor gas utilities as published by the Federal Energy Regulatory Commission (FERC) in Title 18 of the Code of Federal Regulations, Part 201. Information about the Code of Federal Regulations regarding the version adopted and where to obtain it is set out in WAC 480-90-999, Adoption by reference.

(2) Gas utilities having multistate operations must maintain records in such detail that the costs of property located and business done in Washington can be readily ascertained in accordance with geographic boundaries.

(3) Any deviation from the uniform system of accounts, as prescribed by the FERC, will be accomplished only after due notice and order of this commission.

(4) This rule does not supersede any commission order regarding accounting treatments.