Mr. Hagerty specializes in planning and regulatory matters related to the electric power system in an increasingly decarbonized future.

His expertise includes long-term generation and storage resource planning, transmission planning and development, and electrification of transportation and heating. Mr. Hagerty has experience working on matters related to electric vehicle adoption and system impact analysis; renewable resource, generation, and storage asset valuation; decarbonization policies; and transmission benefit-cost analysis.

He has assisted a wide range of stakeholders – including electric utilities, generation and transmission developers, state agencies and commissions, automakers, and regional transmission organizations (RTOs) – in understanding and evaluating strategic questions related to the clean energy transition. This has included planning the buildout of the transmission network, assessing the future generation resource mix, and analyzing the pace and impact of electric vehicle (EV) and heating electrification adoption. He has also forecasted scenarios for the deployment of EV charging infrastructure necessary to meet increasing demand and customer adoption of greenhouse gas-reducing technologies, such as electric heat pumps, energy efficiency, and rooftop solar.

Mr. Hagerty has submitted testimony to state and federal commissions related to generation resource additions to achieve decarbonization goals, electric vehicle infrastructure needs, transmission planning processes and benefits analysis, and electricity market design. For the US Department of Energy, he has reviewed and outlined major issues facing the country’s electric power infrastructure.

Prior to joining Brattle, Mr. Hagerty was a research assistant at the MIT Energy Initiative, an oil refinery process engineer at Honeywell, and a research chemist at GE Global Research.


Massachusetts Institute of Technology
MS in Technology and Policy

University of Notre Dame
BS in Chemical Engineering

Personal Interests

Mike lives in Maryland with his wife Ellen and four kids, Jack, Connor, Maeve and Sophie. In his free time, he enjoys coaching his kids’ sports teams, hiking in the Adirondacks, and downhill skiing whenever there is snow nearby.


September 26, 2022
Before the North Carolina Utilities Commission, Docket No. E-100, Sub 179, Oral Testimony of John Michael Hagerty on behalf of Clean Power Suppliers Association, in the matter of Duke Energy Progress, LLC, and Duke Energy Carolinas, LLC, 2022 Biennial Integrated Resource Plan and Carbon Plan, September 26, 2022.
January 2022
Before the Public Service Commission of Wisconsin, Docket No. 5-CE-153, Oral Testimony of John Michael Hagerty on behalf of Wisconsin Public Service Corporation and Wisconsin Electric Power Company, regarding Joint Application of Wisconsin Public Service Corporation and Wisconsin Electric Power Company for Authority to Construct the Weston Reciprocating Internal Combustion Engine Project in the Villages of Rothschild and Kronenwetter, Marathon County, Wisconsin, January 2022.
August 27, 2021
Before the Public Service Commission of the District of Columbia, Formal Case No. 1167, An Assessment of Electrification Impacts on the Pepco DC System, prepared for Pepco Holdings, Inc. (with R. Hledik, S. Sergici, and J. Olszewski), August 27, 2021.
November 12, 2020
Before the Federal Energy Regulatory Commission, Docket No. ER21-424, Prepared Direct Testimony of Dr. Jurgen Weiss and John M. Hagerty, November 12, 2020. Attachment A to Application for Authorization to Recovery Costs Associated with an Electric Vehicle Infrastructure Pilot Project, November 12, 2020.