You may find the following web sites useful if you have an interest in or are doing research involving the Public Utility Holding Company Act of 1935:
Federal Energy Regulatory Commission (www.ferc.gov)
State Public Utility Commissions (link to National Association of Regulatory Utility Commissioners (NARUC) site that contains links to all of the State PUCs) (www.naruc.org/Stateweb.htm)