Mark F. Sundback


Straight Talk® is good business



Contact Information

Washington, DC

1350 I Street, NW
Suite 1100
Washington, DC 20005
P: +1.202.662.2755
F: +1.202.662.2739

Mark F. Sundback


Washington, DC Office
1350 I Street, NW
Suite 1100
Washington, DC 20005
P: +1.202.662.2755
F: +1.202.662.2739

Mark is a Partner in the Energy section of the Washington, DC office. Since 1981 he has been extensively engaged in the representation of energy industry participants before federal and state agencies charged with jurisdiction over energy markets and their participants. His representations have focused on the rates, terms and conditions associated with gaining access to regulated energy transmission systems, transactions involving changes in ownership of jurisdictional assets and unbundling matters.

Retail Electric Experience

Mark has been involved in rate proceedings with regard to retail electric service of numerous utilities including Florida Power & Light, Tampa Electric, Duquesne Light, Allegheny Power Utility subsidiaries, First Energy utility subsidiaries, and other utilities in various jurisdictions including Texas, Maryland and Washington, DC. He also has appeared before the regulatory commissions of numerous states.

Wholesale Electric Experience

With regard to wholesale electric service, Mark has been involved in proceedings involving unbundling transmission, distribution and generation rates in PJM and ERCOT. He has been involved in counseling multiple independent merchants of electric power, and in filings on their behalf with the FERC. His work frequently requires the integration of both transactional and regulatory goals. He has been involved in counseling clients in the SERC and ISO-NE regions. He also has been involved in arbitrations involving interpretations of ISO rules and technical aspects of tariff provisions. He also has represented RTOs on issues regarding resource adequacy. Mark has successfully represented entities against RTO claims in arbitration. 

Mark has successfully defended TransCanada Energy from claims by inter alia the California Public Utilities Commission and California’s Attorney General of unlawful market conduct in proceedings arising from the West Coast power crisis in 2000-2001.

He has served as chief energy regulatory counsel in bankruptcy proceedings, involving bankrupt electric generators and their creditors. 

Natural Gas Experience

Mark has been involved in FERC proceedings related to regulation of pipelines since 1981. He has represented several natural gas companies, and has for decades served in a first chair capacity in hearings before the Commission as well as judicial appeals. He has been involved in precedent-setting cases concerning rates, certificates and accounting regulation of natural gas companies, and the scope of FERC’s jurisdiction under the Natural Gas Act, the Outer Continental Shelf Lands Act and the Natural Gas Policy Act.

Representative Experience


  • Successfully represented entities engaged in generation and marketing against RTO claims in arbitration
  • Involved in Commission proceedings in numerous states, including California, Pennsylvania, Texas, Florida and Maryland
  • Served as chief energy regulatory counsel in numerous bankruptcy proceedings, including for bankrupt electric generators and their creditors
  • International energy arbitrations involving pricing of natural gas supplies and power plant fuels


  • Served in first chair capacity involving on the record cases for pipelines in over a dozen NGA Section 4 proceedings involving rates, and has represented other market participants in rate cases as well
  • Has counseled and litigated cases involving innovative pipeline project transactions, including interconnection disputes, contested certificate matters, issues arising from pipeline facilities shared by two pipelines and financing
  • Litigated seminal cases involving application of the Outer Continental Shelf Lands Act to oil and natural gas pipelines      

Pipelines & Electric

  • Reorganizations/restructuring of regulated energy enterprises



Professional Recognition






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