ack T. LeBris Erffmeyer is a member of the Energy & Natural Resources Practice in Greenberg Traurig’s Washington, D.C. office. As a former Assistant Attorney General for the Public Utilities Bureau in the Office of the Illinois Attorney General, Jack was responsible for the prosecution and management of all aspects of administrative litigation before the Illinois Commerce Commission (ICC) on electricity and natural gas cases and before the Federal Energy Regulatory Commission (FERC) on interstate wholesale electricity market cases. His experience includes casework related to formula rate update cases, traditional rate cases, and rider reconciliations, implicating issues such as prudence of capital expenditures, cost-allocation, novel rate designs, accumulated and excess deferred income tax regulatory accounting, statutory infrastructure upgrade programs, bad debt expense, return on equity, and ratemaking implications of the 2017 federal income tax law change.