Michael Messonnier

Hunton Andrews Kurth LLP

$ $$$

East Byrd Street 901-951
Richmond 23219 VA US

Michael J. Messonnier, Jr.’s practice focuses on regulatory, finance, and market design matters for domestic energy sector clients.

Michael’s practice has concentrated on representing Independent System Operators (“ISOs”) and other energy sector clients in their dealings with federal and state regulatory agencies and reliability organizations, in the design and operation of ISO markets, in the development and application of finance rules, and on various corporate governance matters.


  • Involved in various federal and state regulatory issues encountered by ISOs and other energy sector clients, including tariff and market rule revisions, FERC rulemaking proceedings, responding to complaints at FERC, and other FERC and public service commission related litigation.
  • Advised the New York Independent System Operator (“NYISO”) in the design of energy, ancillary services, installed capacity, and transmission congestion contract markets, including advising on the development and administration of cost recovery, financial settlement, credit support, black start service, code of conduct, dispute resolution, and other market, operational, and corporate matters.
  • Advised the NYISO on various corporate governance matters.
  • Advised clients in connection with planning and interconnection matters.
  • Advised ISOs in connection with FERC compliance audits.
  • Advised clients in connection with FERC Office of Enforcement and public service commission investigations and data requests.


  • JD, Tulane University, magna cum laude, 2006
  • BA, History, Oglethorpe University, 2001


  • Virginia
  • New York


  • Energy Bar Association


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East Byrd Street 901-951
Richmond 23219 VA US
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Lina Stillman

Broadway 42
New York 10006 NY US