Mary-Kaitlin E. Rigney Associate

Mary-Kate represents electric utilities and natural gas pipeline customers on a variety of matters before the Federal Energy Regulatory Commission (FERC) and state public utility commissions.

Mary-Kate’s practice focuses on the regulation of electric utility and natural gas industries by the FERC and state public utility commissions. In particular, Mary-Kate’s experience before FERC includes representing investor-owned utilities and natural gas pipeline customers in regulatory and rate case litigation proceedings before the FERC under Sections 205 and 206 of the Federal Power Act and Sections 4 and 5 of the Natural Gas Act. Mary-Kate also advises on rate issues including cost-of-service, market-based, and formula rates. Additionally, Mary-Kate has experience representing companies seeking various regulatory approvals from FERC, including Section 203 approvals under the Federal Power Act, exempt wholesale generator and qualifying facility status determinations, and market-based rate authority.

At the state level, Mary-Kate assists electric and gas utilities with rate case proceedings before state public utility commissions.

Mary-Kate’s practice also involves structuring and negotiating project development agreements for renewable energy projects, including power purchase agreements, engineering and construction contracts, long-term supply agreements, and operation and maintenance agreements. Specifically, Mary-Kate has worked on solar, wind, and battery projects.

Before joining McGuireWoods, Mary-Kate worked as an associate at a law firm in Washington, D.C. where she frequently assisted in representing clients in administrative litigation and settlement proceedings before the FERC. In that role, Mary-Kate also assisted with federal appeals of FERC actions before the District of Columbia Court of Appeals.

Mary-Kate graduated cum laude from American University Washington College of Law, where she was a senior staff member on the American University Law Review.

  • American University Washington College of Law, JD, cum laude, Senior Staff, American University Law Review, 2016
  • Rensselaer Polytechnic Institute, BS, Science, Technology, and Society, minor in Biology, cum laude, Dean's List, 2013

Member, Energy Bar Association

  • North Carolina
  • District of Columbia
  • U.S. Court of Appeals for the District of Columbia Circuit
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