This account must include the amount by which the aggregate price received for services rendered to non-associate utility companies differs from the sum of the total direct and indirect costs and compensation for use of capital which are properly allocable to such services (See accounts 458.1 through 458.3 (§§ 367.4581 through 367.4583 ) and General Instructions in § 367.23 ).
18 C.F.R. §367.4584