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Iskender "Alex" H. Catto is Co-Chair of the Energy & Natural Resources Practice and Chairs the Power Industry Projects and Restructuring Practice. Alex advises clients on complex corporate matters, including asset acquisitions, project development, mergers, and restructurings. He also represents clients on state and federal regulatory matters, financings, and commodity, renewable energy, financial, and derivative hedging transactions.

His experience includes representing generators, marketers, private equity clients, pipelines, utilities, and governmental entities in a wide variety of complex matters.

Prior to joining the firm, Alex was a partner in a Chicago-based international law firm where he negotiated billion-dollar power purchase agreements and asset sales, including the $52 billion merger of an energy conglomerate and the $4.5 billion sale of one-half of a nuclear generation business.


  • Energy asset restructuring
  • Renewable energy transactions
  • High-value asset sales
  • Federal regulatory matters
  • Global energy and infrastructure



  • Representing Energy Future Holdings Corp. and 70 of its affiliates in their Chapter 11 cases in the U.S. Bankruptcy Court for the District of Delaware. EFH is the largest generator, distributor, and certified retail provider of electricity in Texas. EFH's Chapter 11 case is the largest Chapter 11 case ever filed in Delaware and the seventh largest Chapter 11 case filed in history with over $49 billion in liabilities.
  • Represented Constellation Energy Group in its merger with Exelon Corporation for a combined enterprise value of $52 billion.°
  • Represented Constellation Energy Group in its sale of one-half of its nuclear generation business to Electricite de France SA, France's state-controlled utility company, for $4.5 billion.°
  • Represented Constellation Energy Group in its $365 million purchase of two 550 MW Texas power plants from Navasota Holdings, and represented Lake Capital in its $304 million sale of power and natural gas retailer Hudson Energy Corp. to Just Energy Income Fund of Canada.°
  • Represented North American Petroleum USA in its Chapter 11 restructuring.°
  • Represented one of America's largest privately held companies, Flying J, Inc., in its restructuring.°
  • Represented Calpine Corporation in its $18 billion restructuring, including the negotiation of numerous long and short-term power sales agreements.°
  • Represented NRG Energy, Inc. in its $12 billion reorganization under Chapter 11 of the Bankruptcy Code.°
  • Represented the California Department of Water Resources, during California's energy crisis, in connection with the renegotiation of several of the State's long-term energy contracts, including extensive complex negotiations both within and without the Federal Energy Regulatory Commission's settlement proceedings.°
  • Represented the California Department of Water Resources' Fuels Team in the creation and implementation of the Department's natural gas program, including the negotiation of nearly all of the Department's natural gas transmission, storage and purchase enabling agreements, and all related fuel cost hedging instruments.°

°The above representations were handled by Mr. Catto prior to his joining Greenberg Traurig, LLP.

Recognition & Leadership

  • Recommended, The Legal 500 Latin America Guide, "Latin America: International – Projects and Energy," 2022
  • Listed, The Legal 500 United States, 2016 and 2020-2022
    • Energy: Renewable/Alternative Power, 2021-2022
    • Energy Transactions: Oil and Gas, 2022
    • Energy Regulation: Oil and Gas, 2022
    • Energy Regulation: Conventional Power, 2022
  • Listed, Euromoney's Expert Guide: Energy and Environment, 2017-2021


  • MSt., Sustainability Leadership, University of Cambridge
  • J.D., Seton Hall University School of Law
  • A.L.B., cum laude, Harvard University
  • New York
  • New Jersey
  • District of Columbia
  • Supreme Court of the United States