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I I I I I I I I I I I I I I I I I I I 75 environmental compatibility by addressing concerns including water contamination, air quality, noise pollution, waste disposal, growth inducing impacts, effects on plant and animal communities, aesthetics and visibility considerations. In conclusion, with load growth projections falling and sufficient generation resources now under construction in many areas of the WSCC region, opportunities to economically transfer power between areas should exist to provide firm and non-firm resources to areas that are dependent Dn oil or that may be experiencing generation deficiencies. The success by which these transfers are made will depend upon the ability of the utilities to meet financial, regulatory, and environmental challenges. RESULTS OF SYSTEM STUDIES Studies performed by the Council and its Member Systems to assess the reliability of the interconnected bulk power system indicate that a number of remedial action schemes currently in use throughout the WSCC region will continue to be necessary, at least in the near term, to provide for acceptable system performance. These remedial actions include generator tripping, selective load tripping, braking resistor application, controlled system islanding and other measures. Studies performed to assess the impact of future system additions demonstrate that, for the most part, improved system performance will be achieved with the addition of new facilities. For instance, results of studies conducted by Northwest Power Pool members addressing loss of large blocks of generation or regional interconnections in the Pacific Northwest during 1990 light load, heavy import conditions illustrate a definite improvement in system performance due to strengthening of the 500 kV transmission system within the area. Also, results of studies conducted on the eastern portion of the WSCC system indicate that transmission additions (primarily as a result of new generation projects) will strengthen the overall eastern WSCC system from Colstrip to Four Corners, and will thus result in a reduced likelihood of system separation (islanding) between Colorado and Wyoming during system disturbances. However, in the 1983-1991 time frame, transmission limitations will still restrict economy energy transfers out of the Colorado-Wyoming-Montana area to Southern California or the Pacific Northwest. ADEQUACY OF THE TRANSMISSION SYSTEM The WSCC interconnected transmission system is expected to be adequate to accommodate anticipated firm and most non-firm schedules in the coming ten-year period. Planned additions are expected to alleviate most of the transmission limitations currently being experienced, however problems are anticipated to persist in the Rocky Mountain Power Area and the importation of additional non-oil-fired energy into the