Mark Sundback

Sheppard, Mullin, Richter & Hampton LLP

Mark F. Sundback is a Partner in the Real Estate, Land Use and Environmental Practice Group in the firm’s Washington, D.C. office. Since 1981 Mark 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.

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.

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.

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.


  • Has been involved in seminal cases defining limits on FERC’s jurisdiction
    • Represented Amerada Hess Corporation in the case establishing the modern “modified primary function” test for gathering and secured recognition of non-jurisdictional status under NGA Section 1(b)’s production and gathering exemption for the longest high pressure pipeline downstream of treatment facilities in FERC’s history as of that time
    • Represented pipeline owners in litigation involving the Outer Continental Shelf Lands Act
  • Litigated issues involving importation and exportation of natural gas supplies at the Department of Energy and FERC; has advised multiple industry participants regarding LNG
  • Established the basis for a successful agreement between joint owners of a single pipeline that resolved long-running disputes
  • Extensively involved in disputes before FERC regarding income tax allowances for pass-through entities and the FERC’s method of determining return on equity
  • Successfully represented only entity subject to FERC jurisdiction involved in the California 2000-2001 power crisis that has not either provided consideration as part of a settlement or been found to have engaged in some form of market manipulation
  • Represented generation developers on issues related to: interconnection queues; in arbitrations with regional transmission organization regarding market rules; and compensation and in disputes involving automatic generation control/regulation service


  • J.D., Columbia Law School, 1981, Columbia Journal of Transnational Law, Editor
  • B.A., Dickinson College, 1978, magna cum laude, Omicron Delta Kappa, William Lenox Avis Prize


  • District of Columbia
  • US Court of Appeals for the First Circuit
  • US Court of Appeals for the Fifth Circuit
  • US Court of Appeals for the Ninth Circuit
  • US Court of Appeals for the Tenth Circuit


Rate : $$$

What types of cases Attorney Mark Sundback & Sheppard, Mullin, Richter & Hampton LLP can handle?
Sheppard, Mullin, Richter & Hampton LLP can handle cases related to laws concerning Real Estate, Bankruptcy, Health Care, Land Use & Zoning, Project & Equipment Finance, Energy Utilities & Environmental. We manually verify each attorney’s practice areas before approving their profiles and reviews on our website.
Where is Sheppard, Mullin, Richter & Hampton LLP located?
Sheppard, Mullin, Richter & Hampton LLP is located at 2099 Pennsylvania Ave NW #100, Washington, DC 20006, USA. You can reach out to Sheppard, Mullin, Richter & Hampton LLP using their phone line 202.747.1946. You can also check their website or email them at [email protected].
How much would it cost to hire Sheppard, Mullin, Richter & Hampton LLP?
Mark Sundback lawyer charges are specific to each case. However, they work with contingency fees and its ranges from $$ to $$$. They also provide free consultation [and no obligation quotes] if you are interested to hire.
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Sheppard, Mullin, Richter & Hampton LLP
2099 Pennsylvania Ave NW #100, Washington, DC 20006, USA
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