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The tables and figures appearing on pages 13, 17, 19, 42, 117, 131, 136, 151, 155, 176, 207, 212, 235, 236, 237, 239, 240, 242, 248, 283, and 284 are copyrighted and are reproduced herein with permission of the copyright holder. Further reproduction of these copyrighted materials is prohibited without specific permission of the copyright holder. All other material contained in this volume is in the public domain and may be used or reproduced without permission from the Institute or the authors. Citation of the source is appreciated.

This publication was prepared by EEI, Alexandria, Virginia, under contract no. ADM-281-91-0003.

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