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Power users are responsible for all costs assigned to power. This includes the costs associated with power production and transmission, as well as most of the costs assigned to irrigation. Reclamation determines the irrigators' ability to repay the investment costs assigned to irrigation and any irrigation costs above that level are the responsibility of power. Portions of the costs assigned to irrigation and other consumptive uses are suballocated to M&I water users. The suballocation to M&I is made in stages, reflecting the timing and quantity of the need for M&I water. The costs are suballocated on a cost-per-acre-foot basis, adjusted according to the time remaining for repayment. 1. Power-Related Investments. The total cost of all power-related investment, including all project and participating project powerplants, the CRSP Transmission System, and that portion of multipurpose investment allocated to power for repayment, is shown in Column 23 of the PRS Executive Summary, Appendix J. Appendix N shows the cumulative investment in these facilities through the end of FY 1989, as well as the annual cost of the additional investments expected to come on-line from FYs 1990 through 1994. The majority of construction cost since the last CRSP rate increase has been due to improvements in the CRSP Transmission System. The Western Colorado 345-kV Transmission System is required to relieve the long-standing major clockwise loopflow through Western Colorado, and to improve the functioning of the entire CRSP Transmission System, as it ties into systems owned by other area power producers. The Western Colorado System is being constructed in stages. Phase I, consisting of a new Rifle-San Juan 345-kV line, is almost complete. Phase II is under study and will be coordinated with additional transmission planned for Northern Arizona. The CRSP Communication System has had and continues to have areas where attenuation of the microwave communication signal exceeds the 40 db recommended by the Western Systems Coordina- tion Council (WSCC). Much of the system has been upgraded and when the South Microwave System is completed, the system will equal or exceed the WSCC criteria. The Glen Canyon-Navajo Interconnection will tie the 230/345-kV Glen Canyon System to the 500-kV Navajo system. This tie will relieve the transmission bottleneck which presently exists at Glen Canyon, and will be useful when the Northern Arizona Transmission System is placed into service. The Northern Arizona Transmission System and the Shiprock- Albuquerque Transmission Line collectively, along with the Glen Canyon-Navajo Interconnection, should eliminate the transmission bottleneck which occurs in the southern part of the CRSP Transmission System. 16