Click for Map of ISO/RTO's - http://www.ferc.gov/market-oversight/mkt-electric/overview.asp

New England ISO - http://www.iso-ne.com/genrtion_resrcs/dr/providers/demand_response_service_provider_directory.pdf

New York ISO - http://www.nyiso.com/public/webdocs/products/demand_response/general_info/dr_providers.pdf

MidWest - http://www.midwestmarket.org/

CAISO - http://www.caiso.com/

ERCOT - http://www.ercot.com/services/programs/load/

Ontario - http://www.powerauthority.on.ca/Page.asp?PageID=924&ContentID=6626