Fully revised to bring material completely up to date; focuses on how the present energy situation influenced policies that have considerable impact on electric power supply, while also covering a wide range of power system engineering, including a new section on overhead line design combined with the previous material on underground cables. This edition includes a critical summary of new energy sources and conservation measures, and in particular their possible impact on the electricity supply industry. In addition, the influences of environmental constraints are included in the discussion of generation and transmission.