Abridgment of review of status of power generation: Annual report of committee on power generation

The volume of electric energy generated in central stations in the United States during 1928 was almost exactly 10 per cent greater than during the preceding year; and it is only a matter of months now until the yearly production in such plants will have reached a figure of 100 billion kw-hr. Hydro plants produced 40 per cent or more of the total output, a share of the total power generation larger than in any year of the last decade and due in part to better than average rainfall conditions. Coal constituted almost 90 per cent of the fuel burned for the generation of electric energy. The volume of electric output in plants other than central generating plants was about 30 per cent of central station production.