0001193125-08-085498 SC 13D/A 1 20080421 20080421 LIVINGSTON DONALD A 0001005578 SC 13D/A 6034311780 500 MARKET ST SUITE 1E PORTSMOUTH NH 03801 ENVIRONMENTAL POWER CORP 0000805012 4991 042782065 DE 1231 SC 13D/A 34 005-39155 08766362 120 WHITE PLAINS RD SUITE 610 TARRYTOWN NY 10591-5546 914-631-1435 120 WHITE PLAINS RD SUITE 610 TARRYTOWN NY 10591-5546 SC 13D/A 1 dsc13da.htm SCHEDULE 13D AMENDMENT NO.7