Gregory Eisenstark


Greg maintains a comprehensive energy and utility regulatory practice, with experience in:

  • base rate cases,
  • rate clause filings,
  • reliability issues,
  • transmission project siting applications,
  • utility industry mergers and acquisitions,
  • renewable energy, including solar and offshore wind projects,
  • demand response and energy efficiency issues,
  • regulatory audits,
  • utility financing issues,
  • formula rate cases, and
  • transmission incentive rate filings.

He has experience in administrative rulemaking, drafting legislation and counseling on energy policy and legislative matters, as well as appellate experience in both state and federal courts.

Mr. Eisenstark has personally litigated hundreds of utility rate and regulatory filings to successful completion. He was the main drafter of New Jersey legislation permitting utilities to own renewable generation and energy efficiency measures and to earn a full return on the investment. He also successfully defended, in both state and federal courts, a New Jersey Board of Public Utilities decision allowing utilities to retain ownership of renewable energy certificates for pre-existing power purchase contracts.

Prior to joining Windels Marx, Mr. Eisenstark was Senior Counsel in the Energy Practice Group of an international law firm. Before that, he served as Associate General Regulatory Counsel for Public Service Enterprise Group (PSEG), where he represented PSEG's operating companies in regulatory matters before the New Jersey Board of Public Utilities, the Federal Energy Regulatory Commission, other state utility commissions, and in state and federal courts.

Earlier in his career, Mr. Eisenstark was Managing Attorney - Electric for the New Jersey Division of Ratepayer Advocate, where he represented utility customers in matters before regulatory agencies and courts. In that capacity, Mr. Eisenstark played an active role in the transformation of the PJM Interconnection from a power pool to an independent system operator.

Before that, Mr. Eisenstark was a Deputy Attorney General of New Jersey, where he represented the Board of Public Utilities and Department of Environmental Protection in utility and solid waste industry matters.

Speaking Engagements

He has spoken on energy and utility issues for the New Jersey Institute of Continuing Legal Education, the New Jersey State Bar Association, and at other industry conferences. He has also been a guest lecturer on utility rate issues at Rutgers University School of Law and Seton Hall University School of Law.

Rankings & Accolades

  • Mr. Eisenstark was selected for inclusion in The Best Lawyers in America for Energy Law (2016-2019). In addition, in 2019 he was also named "Lawyer of the Year" for Energy Law by the same publication.

Gregory Eisenstark


New Brunswick, NJ
T. 732.448.2537
F. 732.846.8877

  • J.D., Rutgers University School of Law - Newark, 1991
  • B.A., biology, Oberlin College, 1984

  • New Jersey
  • Pennsylvania
  • New York
  • United States Court of Appeals for the Third Circuit
  • United States Court of Appeals for the District of Columbia
  • United States District Court for the District of New Jersey