In electric power: the regulated cost or charges for the use of a transmission system which may include the availment of ancillary services [Section 4(aaa), Electric Power Industry Reform Act of 2001; Section 4(oooo), Rules and Regulations to Implement Republic Act No. 9136, Entitled “Electric Power Industry Reform Act of 2001”]
Note: The IRR adopts the definition under the law, except for an adjustment to the writing style (capitalization of defined term, “Ancillary Services”).