Logo for print Skip to main content
Mark K. Lewis
Mark K. Lewis
Managing Partner, Washington, DC
Mark K. Lewis

Mark K. Lewis

Managing Partner, Washington, DC

About Mark

Mark Lewis, managing partner of the firms Washington, DC office, focuses his practice on oil and gas pipeline and related midstream, regulatory and transactional matters. His clients include oil and gas pipeline developers, owners, operators and investors; oil and gas producers and marketers; gas distributors; and large industrial energy consumers.

He handles US and international oil and gas pipeline development projects with respect to project structuring, contracting and governmental approvals. He represents regulated pipelines, pipeline ownership interests regarding pipeline management issues, clients in transactions involving the acquisition of pipeline companies and pipeline assets, and developers of pipelines and other oil, gas and CO2 infrastructure. In his practice, Mark provides legal counsel in contract negotiations involving operating, transportation, and purchase and sale agreements. He also advises clients regarding regulatory aspects of project development, contract, tariff, rate and compliance matters before the Federal Energy Regulatory Commission (FERC) and various state regulatory agencies.

Mark Lewis is exceptional at energy regulation law. An industry expert that explains solutions and risks in terms that anyone can understand. A great communicator with appropriate knowledge, charisma, and humor.
The Legal 500 United States, 2023


Recent Notable Matters

TC Energy Corporation — $1.14 billion divestiture of Portland Natural Gas Transmission System to funds managed by BlackRock and Morgan Stanley Infrastructure Partners

TC Energy Corporation — US counsel in connection with the Government of Alberta’s $1.1 billion equity investment and $4.2 billion loan guarantee to support construction of the Keystone XL crude oil pipeline

TC Energy Corporation — approximately $1.275 billion sale of US midstream assets held by its subsidiary, Columbia Midstream Group, to a subsidiary of UGI Corporation including regulatory work, jurisdictional analysis and responding to buyer diligence

Apache Corporation — strategic partnership with EPIC Midstream Holdings, LP and Noble Energy Inc. to develop the EPIC Crude Oil Pipeline, including transportation service agreements, tariffs and related regulatory matters

Apache Corporation — formation of SCM Alpine, LLC, which will own and operate a greenfield NGL y-grade pipeline, including transportation service agreements, tariffs and related regulatory matters

Midstream company — development of a new interstate natural gas pipeline, including FERC certificate issues and commercial agreements

Energy Transfer Partners, L.P. — commercial contracting and regulatory issues associated with the development of Dakota Access Pipeline, a major new interstate crude oil pipeline system

EQT Corporation — major expansion of the Equitrans L.P. interstate natural gas pipeline system, including FERC certificate issues and commercial agreements

Targa Resource Partners LP — FERC rate cases for an interstate natural gas pipeline subsidiary

Government of the Republic of Kazakhstan — development of the Kashagan oil field, the largest discovered, undeveloped oil field in the world

EQT Corporation — commercial contracting and regulatory approvals associated with EQT’s sale of its gas utility and receipt by exchange of approximately 200 miles of transmission pipeline that required FERC certificate authority to be integrated into EQT’s interstate pipeline company

Sunoco Logistics — commercial and regulatory matters related to the development of pipelines

Delek Logistics — crude oil and refined products pipeline commercial contracting and regulatory matters

Delek Logistics — long-term lease of refined products pipeline capacity from Enterprise Products, including the lease negotiation and the applicable regulatory treatment

Targa Resource Partners LP — variety of midstream commercial and regulatory matters

Pilgrim Pipeline Holdings — development of a new crude oil and refined products pipeline system

La Caisse de Depot et Placement du Quebec — investments in United States pipeline infrastructure and related transactions

A large independent producer — development of pipeline infrastructure to support a large discovery

Publications and Speeches

“Updating and Modernizing Tariffs,” LEPA 2022 Annual Business Conference, September 2022.

“Reasonable Rates of Return Benefits Pipelines and Shippers Alike,” Pipelines & Gas Journal, October 2016.

“Another Bite at the Apple: Renegotiating Rates with Distressed Shippers,” Pipelines & Gas Journal, July 2016.

“Court Decision Could Change Tax Burden on Pipeline MLPs,” Midstream Business, July 2016.

“Credit Challenges to Project Development,” Midstream Business, July 2015.

“FERC Issues Pair of Oil Pipeline Audits,” Pipeline & Gas Journal, August 2015.

“Pipeline Audits,” American Petroleum Institute’s 2015 Pipeline Conference and Control Room Forum, April 2015.

"Pipelines for New Energy," Energy & Infrastructure, April 2013.

Platts Annual Pipeline Development and Expansion Conference, Houston, Texas, 2008-2012.



Georgetown University Law Center,
magna cum laude
University of Maryland College Park,
magna cum laude

Bar Admissions

District of Columbia


Association of International Petroleum Negotiators
Robert H. Smith School of Business at the University of Maryland
Chairman of the Dean’s Advisory Board
University of Maryland College Park Foundation
Board of Trustees






Chambers Global
Energy: Oil & Gas (Regulatory & Litigation), 2011 - 2024
Chambers USA
Nationwide Energy: Oil & Gas (Regulatory & Litigation), 2006 - 2023
The Legal 500 United States
Energy Regulation: Oil and Gas, 2017 - 2023 (Leading Lawyer, 2018 - 2023); Energy: Regulation, 2012, 2014 - 2016; Energy Litigation: Oil and Gas, 2019, 2021; Energy Transactions: Oil and Gas, 2018
Delinian Limited
IFLR1000 Financial & Corporate and M&A Guide
2018 - 2023
Lawdragon Inc.
Lawdragon 500 Leading Lawyers in America
Energy Regulation, 2024
Lawdragon Inc.
Lawdragon 500 Leading US Energy Lawyers
Energy Transactions, 2023 - 2024
BL Rankings
Best Lawyers
Oil and Gas Law, 2024
Law Business Research Ltd.
Who’s Who Legal
Energy – Oil & Gas Global Leader, 2023
Globe Business Media Group
International Law Office Client Choice Award


Past Events

2023 LEPA Annual Business Conference

September 19, 2023 - September 22, 2023

2015 Pipeline Conference and Control Room Forum

Savannah April 28, 2015 - April 30, 2015