The following terms wherever used herein shall have the following meanings:

(a) Billing Period shall mean the service period beginning on the first day and extending through the last day of any calendar month.

(b) Boulder City Area Projects shall mean the Boulder Canyon Project, the Parker-Davis Project, and the United States entitlement in the Navajo Generating Station (a feature of the Central Arizona Project).

(c) Capacity shall mean the aggregate of contingent capacity specified in section 105(a)(1)(A) and the contingent capacity specified in section 105(A)(1)(B) of the Hoover Power Plant Act (43 U.S.C. 619).

(d) Central Arizona Project shall mean those works as described in section 1521(a) of the Colorado River Basin Project Act of 1968 (43 U.S.C. 1501 et seq.), as amended.

(e) Colorado River Dam Fund or Fund shall mean that special fund established by section 2 of the Project Act and which is to be used only for the purposes specified in the Project Act, the Adjustment Act, the Colorado River Basin Project Act of 1968, and the Hoover Power Plant Act.

(f) Contract shall mean any contract for the sale of Boulder Canyon Project capacity and energy for delivery after May 31, 1987, between Western and any contractor.

(g) Contractor shall mean the entities entering into contracts with Western for electric service pursuant to the Hoover Power Plant Act.

(h) Excess Capacity shall mean capacity which is in excess of the lesser of: (1) Capacity that Hoover Powerplant is capable of generating with all units in service at a net effective head of 498 feet, or (2) 1,951,000 kW.

(i) Excess Energy shall mean energy obligated from the Project pursuant to section 105(a)(1)(C) of the Hoover Power Plant Act (43 U.S.C. 619).

(j) Firm Energy shall mean energy obligated from the Project pursuant to section 105(a)(1)(A) and section 105(a)(1)(B) of the Hoover Power Plant Act (43 U.S.C. 619).

(k) Overruns shall mean the use of capacity or energy, without the approval of Western, in amounts greater than Western's contract delivery obligation in effect for each type of service provided for in the Contract.

(l) Project or Boulder Canyon Project shall mean all works authorized by the Project Act, the Hoover Power Plant Act, and any future additions authorized by Congress, to be constructed and owned by the United States, but exclusive of the main canal and appurtenances authorized by the Project Act, now known as the All-American Canal.

(m) Replacements shall mean such work, materials, equipment, or facilities as determined by the United States to be necessary to keep the Project in good operating condition, but shall not include (except where used in conjunction with the word “emergency” or the phrase “however necessitated”) work, materials, equipment, or facilities made necessary by any act of God, or of the public enemy, or by any major catastrophe.

(n) Uprating Program shall mean the program authorized by section 101(a) of the Hoover Power Plant Act (43 U.S.C. 619(a)) for increasing the capacity of existing generating equipment and appurtenances at the Hoover Powerplant, as generally described in the report of the Department of the Interior, Bureau of Reclamation, entitled “Hoover Powerplant Uprating, Special Report,” issued in May 1980, as supplemented in the report entitled, “January 1985 Supplement (revised September 1985) to Hoover Powerplant Uprating, Special Report-May 1980.”