From: "Olin Lathrop" > .... Large power plants take minutes to hours to respond to demand > changes. Hydro plants can be surprisingly fast to respond. I developed the control software that ran the Niagara Falls power plant (Robert Moses plant) in the mid eighties. That plant, which generates about 2.5GW was able to raise or lower its output some hundreds of MW in the matter of a few seconds. -- Bob Ammerman RAm Systems -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist