He served as legislative programs director for the American Nuclear Energy Council and represented Public Service Electric and Gas Company (PSEG) until 1995.
Kelliher's nomination to FERC was announced by President George W. Bush in October 2001, but he did not receive his hearing in front of the Senate committee until 2003.
Under Kelliher's leadership, FERC launched a number of major market manipulation investigations, some of which resulted in significant civil penalties.
Kelliher was responsible for efficient implementation of the Energy Policy Act of 2005, the largest grant of regulatory power to FERC since the New Deal in the 1930s.
[6] He left FERC in March 2009 to become Executive Vice President for Federal Regulatory Affairs for NextEra Energy, Inc. (FPL Group).