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<br /> 18 <br /> 17 <br /> 16 Conventional and pumped Reserve <br /> storage hydroelectric capacity <br /> 15 peak i ng capac ity <br /> 14 Older steam <br /> electric <br /> 13 capac ity <br /> 12 <br />VI <br />+-> 11 Pumping <br />+-> <br />to energy <br />3 <br />0 10 require <br />'r- ments <br />..:::t!. <br />c: 9 <br />0 <br />,...... <br />,...... 8 <br />'r- <br />E <br />c: 7 <br />or- <br />"0 <br />to <br />0 6 <br />-l <br /> 5 <br /> 4 <br /> 3 <br /> 2 <br /> 1 <br /> 0 <br /> Sun <br /> <br /> <br />Figure 3. Weekly load curve of a large electric utility system (U.S. Army <br />Corps of Engineers 1979). <br /> <br />11 <br />