Sidley Austin LLP

Energy & Natural Resources

9 ranked lawyersBand 2USA - NationwideUSA 2021 View ranking table
chambers review
department information
Ranked Lawyers
chambers review
department information
Ranked Lawyers

Chambers Review

Chambers Research is conducted by 200 Research Analysts, across 200 jurisdictions and provides nearly 6,000 rankings tables. Annually we collect hundreds of thousands of responses from clients, the majority via in-depth interview. Learn more about our methodology.

What the team is known for

Offers clients broad expertise in the energy space covering transactional, regulatory and litigation work. Particularly well thought of in the oil and gas space with capability across upstream, midstream and downstream matters. Represents clients before FERC on regulatory approvals, enforcement and rate issues. Offers additional strength in power regulation and litigation, assisting clients participating in the generation, transmission and distribution and trading of electricity. Also offers capabilities in transactional matters for electricity clients.


A client reports: "It's an extremely good firm with excellent litigators. It has a very deep bench and it's in tune with government issues and connected with the DOJ."

Interviewees note: "Sidley is a global leader that is well positioned to represent clients on transactional, regulatory and litigated matters across a wide range of industries."

Sources report: "They are a go-to in project finance, and have a good, talented bench of attorneys who draw on multiple different areas of expertise."

Commentators highlight: "They have a very strong reputation and a good caliber of people in various offices."

Observers praise the team's "deep, practical knowledge."

Work highlights

Represented BP America Production Company in the sale of its oil and natural gas properties in Cleveland and McClain Counties to Lime Rock Resources.

Acted for two electric power generation facilities owned by Vistra Energy Corporation in FERC proceedings to obtain compensation for reactive power supply services in PJM Interconnection.

Represented Anixter International in its $4.5 billion acquisition by WESCO International.

Advised NiSource on the regulatory aspects of its $1.1 billion sale of its subsidiary, Columbia Gas of Massachusetts, to Eversource Energy.

Notable practitioners

Christopher Polito is adept at representing major energy clients before FERC. He is noted for his experience handling tariff and cost matters, as well as nonpublic investigations.
"He has a very broad-based market knowledge and a good sense of what the regulators are doing." "He's very responsive and does a good job handling the details."

Cliff Vrielink has a notable practice advising pipeline and investment companies on asset purchase and sale transactions.
"A smart, thoughtful lawyer who can bring people together and get a transaction across the finish line; he is the consummate deal lawyer."

David Asmus has an impressive pedigree handling domestic and cross-border transactions spanning oil and LNG.
"A truly stellar lawyer. If there's any international deal or project, he's the guy." "An absolutely fantastic and well-respected lawyer."

Emily Mallen has notable experience handling a range of regulatory matters concerning oil and gas pipelines as well as offering broader compliance advice.
"A go-getter who is fantastic in litigation before FERC."

James Rice is capable of handling a broad range of transactional matters involving exploration and production properties, pipeline assets and refining and processing facilities.
"A very levelheaded, calm and thoughtful lawyer who really knows his stuff." "He understands the market and brings a swath of experience and knowledge."

Kenneth Irvin has sector-spanning expertise including oil and gas pipeline and power market issues, with capabilities representing clients in a range of proceedings before FERC.
"Super easy to work with, really down to earth, practical, smart and provides great client service." "An extremely fine lawyer."

Terence Healey is adept at handling a range of proceedings and providing related regulatory counseling concerning power market matters, including acquisition approval, market manipulation claims and investments.
"Has a terrific depth of knowledge and gives very clear, commercial advice. He is really great at handling weird and wonderful questions regarding FERC or policy matters."

Tim Chandler is an up-and-coming lawyer noted for his work handling various cross-border transactions. He represents investment clients in the purchase of assets, corporate acquisitions and other financings.
"Incredibly bright and a great negotiator, he's fantastic all around." "Smart, pragmatic, responsive and has a very good command of different legal regimes, particularly in Latin America."

Department Information

This content is provided by Sidley Austin LLP.


For more information on the practice, please visit the practice's page at:

Energy & Natural Resources Department

Sidley Austin LLP

Department location

One South Dearborn




IL 60603

View Firm Profile

Ranked Lawyers

Chambers Research is conducted by 200 Research Analysts, across 200 jurisdictions and provides nearly 6,000 rankings tables. Annually we collect hundreds of thousands of responses from clients, the majority via in-depth interview. Learn more about our methodology.

USA - Nationwide

Energy: Electricity (Regulatory & Litigation)

Christopher Polito
Up and Coming
Kenneth W Irvin
Band 5
Terence Healey
Band 4

Energy: Oil & Gas (Regulatory & Litigation)

Emily Mallen
Band 5
Kenneth W Irvin
Band 5

Energy: Oil & Gas (Transactional)

Cliff W Vrielink
Band 4