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Ms. Keuthen’s practice currently focuses on representing energy and utility clients before the Department of Public Utilities and the Energy Facilities Siting Board in cases involving electric transmission lines, substations and ancillary equipment, zoning exemptions and other regulatory matters. She advises electric and gas companies on issues concerning the siting, permitting and licensing of energy facilities and transmission arrangements. Energy, Contract & Administrative Law Catherine J. Keuthen is a partner in Keegan Werlin LLP’s energy and regulatory practice. She concentrates in the areas of utility regulation and energy law, counseling clients and representing them before the Department of Public Utilities and the Energy Facilities Siting Board. Catherine J. Keuthen Phone: 617-951-1400 Email: ckeuthen@keeganwerlin.com ● Administrative Law ● Energy Law ● Contract Law Bar Admissions Supreme Judicial Court of MA U.S. Supreme Court U.S. Court of Appeals First Circuit U.S. District Court District of MA Before joining the firm in 2011, Ms. Keuthen practiced utility law in the private sector and prior to that, she worked as an Assistant General Counsel for NSTAR and Boston Edison Company, successfully representing them on a wide range of matters, including general rate cases, electric industry restructuring, and energy procurement. Ms. Keuthen’s practice currently focuses on representing energy and utility clients before the Department of Public Utilities and the Energy Facilities Siting Board in cases involving electric transmission lines, substations and ancillary equipment, zoning exemptions and other regulatory matters. She advises electric and gas companies on issues concerning the siting, permitting and licensing of energy facilities and transmission arrangements. Education Boston College Law School, Boston, Massachusetts, J.D., cum laude Mount Holyoke College, B.A., cum laude

Ms. Jameson’s other experience includes working at the Federal Energy Regulatory Commission as Attorney-Advisor to several administrative law judges, counseling on substantive legal and administrative issues in contested adjudicatory proceedings related to regulated electric transmission and natural gas pipeline companies. Administrative, Climate, & Energy Law; Public Utilities; Government Relations Elizabeth Jameson is senior counsel at Keegan Werlin LLP, specializing in energy facilities siting and permitting and government relations. Elizabeth Jameson Phone: 617-951-1400 Email: ejameson@keeganwerlin.com ● Public Utilities ● Energy Law ● Climate Law ● Administrative Law ● Government Relations Bar Admissions Massachusetts Before joining the firm in 2025, Ms. Jameson served as the Director of Climate Policy and Planning at the City of Boston, leading the development of climate policies and counseling senior officials on changes to energy siting and permitting laws and regulations, overseeing consultant work on energy transformation issues, and advocating for legislative changes related to energy affordability, competitive suppliers, and other energy-related issues. Prior to her role with the City of Boston, Ms. Jameson was the Deputy General Counsel for Energy and Climate at the Massachusetts Executive Office of Energy and Environmental Affairs where she directly advised three different Secretaries on substantive energy- and climate-related legal and regulatory issues, including advising the Secretaries in their capacity as Chair of the Energy Facilities Sitting Board on various energy infrastructure siting cases. Ms. Jameson's other experience includes working at the Federal Energy Regulatory Commission as Attorney-Advisor to several administrative law judges, counseling on substantive legal and administrative issues in contested adjudicatory proceedings related to regulated electric transmission and natural gas pipeline companies. Education Vermont Law and Graduate School Juris Doctor, 2018 Master's in Energy Regulation and Law, 2018 Symposium Editor, Vermont Journal of Environmental Law Advanced Energy Clinician, Institute for Energy and Environment University of Massachusetts, Amherst B.S. Environmental Science, 2015 Memberships Energy Bar Association New England Women in Energy and Environment

Keegan Werlin LLP provides comprehensive legal services in governmental affairs, including regulatory compliance, public policy, and government relations. Our attorneys advocate in legislative, state, and municipal matters, advising clients on New England laws regulating business, lobbying, ethics, campaign finance, and government procurement. Based in Lexington, MA, we have extensive experience representing clients in projects requiring federal, state, and local advocacy. Governmental & Legislative Relations Overview Keegan Werlin provides a wide range of advocacy services to clients in legislative, state and municipal agency matters. Our attorneys advise clients on Massachusetts laws that regulate business and industry; lobbying, ethics, and campaign finance; government procurement; and the promulgation of regulations. Keegan Werlin possesses extensive experience representing clients in diverse projects requiring federal, state and local representation and advocacy. Our attorneys’ experiences working with members of the Massachusetts Legislature and serving in the Commonwealth’s executive branch has allowed our governmental relations professionals to develop key contacts throughout Massachusetts. State and Legislative Advocacy Keegan Werlin’s legislative practice is tailored to meet the particular needs of the individual client. Among the attorneys at the firm, two attorneys are registered lobbyists with significant experience advocating on behalf of client interests in advancing ideas, goals and objectives into legislation. Additionally, our attorneys assist clients with developing outreach plans to achieve success before various state agencies as they propose regulatory actions that affect their interests. As legislative advocates, Keegan Werlin works with our clients to develop and implement strategic plans to influence legislative initiatives of interest to a particular client. We coordinate outreach to key legislators, organizations and associations to secure a broad base of support. Our legislative tracking and monitoring services can also provide clients with invaluable “eyes and ears” at the State House. Municipal Advocacy At the local level, KW’s attorneys have extensive knowledge from working with municipal officials on project-related issues and local permitting. Skilled in all facets of municipal representation, KW’s attorneys have appeared before more than 50 communities across the Commonwealth on a wide range of client issues.

Peter is a senior associate in the firm’s energy facilities siting and permitting practice. Before joining the firm in 2024, Mr. Madsen worked in the energy practice group at a large, national law firm, representing public utilities and energy companies in a variety of regulatory matters before state public utilities commissions, including utility ratemaking proceedings, obtaining approvals for large energy facility siting and permitting, regulatory compliance... Administrative & Energy Law; Public Utilities Peter is a senior associate in the firm's energy facilities siting and permitting practice. Peter E. Madsen Phone: 617-951-1400 Email: pmadsen @keeganwerlin.com ● Administrative Law ● Energy Law ● Public Utilities Bar Admissions U.S. District Court District of MN Minnesota Colorado Massachusetts Before joining the firm in 2024, Mr. Madsen worked in the energy practice group at a large, national law firm, representing public utilities and energy companies in a variety of regulatory matters before state public utilities commissions, including utility ratemaking proceedings, obtaining approvals for large energy facility siting and permitting, regulatory compliance, contested case proceedings, and other administrative proceedings and related appeals. Prior to moving to private practice, Mr. Madsen served as an assistant attorney general in the Minnesota Attorney General's Office and primarily represented a state agency in a wide variety of energy and public utility regulatory matters before the Minnesota Public Utilities Commission, including general rate case and certificate of need proceedings for large energy infrastructures, such as transmission lines and crude oil pipelines. Mr. Madsen received his Juris Doctor from the Mitchell Hamline School of Law (formerly the Hamline University School of Law) with honors. While in law school, Mr. Madsen was the Operations Editor as well as an Associate Editor of the Hamline Law Review . Mr. Madsen received his Bachelor of Arts in economics from the Miami University in Oxford, Ohio. Education Mitchel Hamline School of Law, St. Paul, Minnesota, J.D., cum laude, 2011 Operations Editor and Associate, Hamline Law Review Miami University, Oxford, Ohio, B.A. Economics, 2003 Recognitions Honoree, Best Lawyers , Ones to Watch, 2022 - 2026 Honoree, Top Lawyers, Administrative/Regulatory Law, Minnesota Monthly , 2024 Associations Minnesota State Bar Association Hennepin County Bar Association

At Keegan Werlin, our attorneys bring a wealth of experience and deep legal knowledge to every case. Based in Lexington, MA, our team specializes in energy, environmental, public utility, and governmental law, representing clients in New England. We are committed to providing strategic, results-driven counsel, offering innovative solutions to navigate complex legal challenges in highly regulated industries. Our attorneys are dedicated to achieving successful outcomes tailored to client needs. Our Team Practical advice from a knowledgeable legal team. Cheryl M. Kimball Managing Partner & Chair of Energy & Regulatory Practice Read More David S. Rosenzweig Executive Partner & Chair of Energy Facilities Siting & Permitting Practice Read More Robert J. Keegan Chairman Emeritus Read More Molly K. Agostinelli Associate Read More Barry P. Fogel Partner Read More John K. Habib Partner Read More Robert J. Humm Partner Read More Catherine J. Keuthen Partner Read More Ashley S. Marton Associate Read More Jessica Ralston Partner Read More Danielle Winter Partner Read More Cheryl A. Blaine Partner Read More Steven Frias Associate Read More Erika J. Hafner Partner Read More Elizabeth Jameson Senior Counsel Read More Michael J. Koehler Partner Read More Sarah Pardee Associate Read More Tiffany N. Tisler Associate Read More Matthew Campbell Of Counsel Read More Jonathan A. Goldberg Senior Counsel Read More Michael B. Hershberg Associate Read More Joseph F. Kelley Associate Read More Peter E. Madsen Senior Associate Read More Kevin F. Penders Partner | Practice Manager Read More Brendan P. Vaughan Partner Read More Practice Areas Energy & Regulatory Law Energy Facilities Siting & Permitting Governmental & Legislative Relations Environmental, Municipal, & Land Use Learn More

Mr. Habib has represented electric utilities in proceedings before the Massachusetts Department of Public Utilities regarding the Massachusetts 2021 Climate Act, the 2008 Green Communities Act and related laws, including proceedings governing the procurement of long-term clean energy, utility and third-party storage, solar incentives, smart grid investments, energy efficiency and the interconnection of distributed generation. Public Utility, Energy, & Administrative Law; Government Relations & Lobbying John K. Habib (Jack) is a partner in Keegan Werlin LLP's energy and regulatory and governmental relations practices, specializing in clean energy and public utility law, as well as governmental advocacy. He represents a number of electric and gas utilities in Massachusetts and Rhode Island on issues concerning clean energy, interconnection, rates, energy efficiency, and energy procurement. John K. Habib Phone: 617-951-1400 Email: jhabib@keeganwerlin.com ● Public Utility Law ● Energy Law ● Administrative Law ● Government Relations & Lobbying Bar Admissions Rhode Island Massachusetts New Hampshire Mr. Habib has represented electric utilities in proceedings before the Massachusetts Department of Public Utilities regarding the Massachusetts 2021 Climate Act, the 2008 Green Communities Act and related laws, including proceedings governing the procurement of long-term clean energy, utility and third-party storage, solar incentives, smart grid investments, energy efficiency and the interconnection of distributed generation. He has also represented electric utilities in Massachusetts and Rhode Island supporting groundbreaking programs to promote the adoption of electric vehicles through the expansion of electric vehicle charging infrastructure. Mr. Habib has represented gas utilities in proceedings before the MA D.P.U. regarding gas system enhancement plans, gas procurement and related issues. Most recently, Mr. Habib has represented the Massachusetts gas utilities, Mr. Habib has represented the Massachusetts gas utilities in D.P.U. 20-80, addressing the gas utilities' net zero enablement plans to meet the Commonwealth's 2050 greenhouse gas reduction targets. Mr. Habib also counsels electric utilities in proceedings relating to the implementation of the Massachusetts Electric Restructuring Act of 1997, including proceedings governing the divestiture of generation facilities and purchase power agreements, implementation of default service policy and service quality. Mr. Habib has also appeared in appellate proceedings before the Massachusetts Supreme Judicial Court on issues concerning administrative and regulatory law. Before joining Keegan Werlin in 1998, Mr. Habib was an attorney at the Massachusetts Department of Public Utilities. He was also General Counsel to Massachusetts State Senator John D. O'Brien from 1993 to 1997, during which time he authored legislation on behalf of the Joint Special Committee on Electric Utility Restructuring. Education Boston University School of Law, Boston, Massachusetts, J.D., 1993 Boston College, Boston, Massachusetts, B.S. Political Science, magna cum laude, 1990 Awards: Dean's List Members and Associations Massachusetts Bar Association Boston Bar Association

Keegan Werlin LLP provides expert legal counsel for energy facility development, regulation, and compliance. Based in Lexington, MA, we serve clients across New England in navigating permitting, land use, and environmental compliance for energy infrastructure projects. Our team offers strategic, results-driven solutions for the energy industry. Energy Facilities Siting & Permitting Overview Siting and licensing critical energy infrastructure in New England has become increasingly complex in recent years. Groundbreaking changes in the permitting landscape, such as the Massachusetts Green Communities Act (2008), Global Warming Solutions Act (2008), Climate Change Act and Roadmap Law (2021), and the most recent Clean Energy Act (2022), have instituted complex requirements and new opportunities for critical energy infrastructure facilities, including, but not limited to electric transmission networks, wind power, solar resources, large-scale battery storage systems, and next-generation electric transmission equipment. KW’s team has been at the forefront of successfully implementing and ensuring compliance with these crucial energy and environmental objectives on behalf of clients throughout the region. The interrelated array of federal, state and local siting and permitting standards requires extensive knowledge of the applicable statutory enactments and regulatory requirements to represent investor-owned utilities and private developers in New England effectively. KW has an unmatched team of legal professionals with over 30 years of experience permitting the most complex array of projects, such as innovative new substation facilities to address sea-level rise, energy storage systems to ensure reliability of electricity, renewable energy facilities such as solar and wind generation, and needed transmission infrastructure to power the New England economy, including the electrification necessary to support the region’s climate change and carbon reduction goals. KW attorneys also have extensive experience defending client interests in state and federal courts when challenged by project opponents. KW’s team-based approach with a demonstrated track record in the areas of environmental science, economics, and state and local land-use requirements ensures that necessary energy infrastructure is permitted and developed in an efficient and successful manner to meet the overarching business objectives of our clients.

Keegan Werlin LLP is a leading New England law firm headquartered in historic Lexington, MA, with decades of experience in energy, environmental, and public utility law. Our dedicated attorneys deliver strategic legal counsel across Massachusetts and the region, aligning with client goals through deep expertise, responsiveness, and a strong understanding of regulatory challenges unique to New England industries. Unrivaled knowledge in regulatory matters. About Our Firm At Keegan Werlin LLP, we specialize in developing creative solutions to the complex challenges our clients encounter in their business environments. Keegan Werlin attorneys are industry leaders in matters regarding energy and regulatory issues, project siting, licensing and permitting, environmental compliance and permitting, land use, government and legislative relations, municipal law and real estate. From start to finish, Keegan Werlin has unrivaled experience and knowledge of energy-related regulatory and policy matters and the project-development and permitting landscape. Our goal is to provide clients with successful results through commitment to client objectives, expertise and responsiveness. We take pride in our ability to understand our client businesses, the environment in which they operate and their priorities for achieving success. We commit to client objectives at all stages of representation and know that there is no success without client success. If you would like to discuss a matter of interest, please contact us today.

Prior to joining the firm, Mr. Frias served as Senior Legal Counsel to the Rhode Island Public Utilities Commission for two years. He then served as Executive Counsel of the Rhode Island Public Utilities Commission and Legal Counsel to the Rhode Island Energy Facility Siting Board for six years. Public Utility, Energy, & Administrative Law; Telecommunication Steven Frias is an associate at Keegan Werlin LLP. He specializes in public utility, energy and regulatory, telecommunications, and administrative law. Steven Frias Phone: 617-951-1400 Email: sfrias@keeganwerlin.com ● Administrative Law ● Energy Law ● Public Utilities ● Telecommunication Bar Admissions Massachusetts U.S. District Court District of RI Rhode Island Prior to joining the firm, Mr. Frias served as Senior Legal Counsel to the Rhode Island Public Utilities Commission for two years. He then served as Executive Counsel of the Rhode Island Public Utilities Commission and Legal Counsel to the Rhode Island Energy Facility Siting Board for six years. During his employment as Executive Counsel, he authored “Beyond 271 – From an Open Market to a Fully Competitive Market: A Roadmap for State Commissions,” for the NRRI Journal of Applied Regulation. Before entering public service, Mr. Frias served as an associate at Zizik, LaSalle & Power, P.C., specializing in litigation. Since 1999, Mr. Frias has taught Paralegals and the Litigation Team in Rhode Island, a seminar at the Institute for Paralegal Education. Memberships & Associations Rhode Island Bar Association R.I. Representative and Member of the RNC Budget Committee, Republican National Committee 2012 - 2024 Board Member, Cranston Historical Society 2009 - 2017 Contributing Opinion Columnist, Cranston Herald 2012 - 2013, 2019 - 2021 Contributing Opinion Columnist, Providence Journal 2013 - 2016 Commissioner, and President of Cranston City Planning Commission, 2021 - Present Treasurer, R.I. Semiquincentennial (250th) Commission, 2021 - Present Chairman, Cranston Charter Review Commission, 2019 - 2020 Published Works Cranston and Its Mayors: A History, The History Press, Charleston SC, 2011 Beyond 271 - From an Open Market to a Fully Competitive Market, NRRI Journal of Applied Regulation, 1, 2003 Flagrant Disregard for Tradition, Suffolk University Law Review, 30, 1997 Education Suffolk University Law School, Boston, Massachusetts, , J.D., cum laude, 1997 Law Review: Suffolk University Law Review, 1996 - 1997 Awards: Dean’s List 1995-97; Best Case Comment, Law Review Staff Competition, 1996; Semi-Finalist, Clark Appellate Advocacy Competition, 1996; Best Brief Writer, First Year Moot Court Section Competition 1995; Best Oral Advocate, First Year Moot Court Section Competition, 1995 Brown University, Providence, RI, B.A. Political Science and International Relations, 1993 Representative Cases NSTAR Electric Company, D.P.U. 17-05 NSTAR Gas Company, D.P.U. 19-120 NSTAR Gas Company, D.P.U. 20-76 Brookline, Case No. 9752 Classes & Seminars Paralegals and the Litigation Team in Rhode Island, Institute for Paralegal Education, 1999 - Present Recognitions Coolidge Prize for Journalism, 2015

Mr. Vaughan received his Juris Doctor from Boston College Law School. While attending Boston College Law School, he worked as a Judicial Intern for The Honorable F. Dennis Saylor, IV, of the United States District Court for the District of Massachusetts. After his first and second years of law school, Mr. Vaughan worked for the Middlesex District Attorney’s Office and as a summer associate for Keegan Werlin. Administrative & Energy Law; Public Utilities Brendan P. Vaughan is a partner at Keegan Werlin LLP specializing in energy, regulatory, and public utility law. He represents energy and utility clients before administrative agencies such as the Massachusetts Department of Public Utilities and the Connecticut Public Utilities Regulatory Authority. Brendan P. Vaughan Phone: 617-951-1400 Email: bvaughan@keeganwerlin.com ● Administrative Law ● Energy Law ● Public Utilities Bar Admissions U.S. District Court District of MA Connecticut Massachusetts Mr. Vaughan received his Juris Doctor from Boston College Law School. While attending Boston College Law School, he worked as a Judicial Intern for The Honorable F. Dennis Saylor, IV, of the United States District Court for the District of Massachusetts. After his first and second years of law school, Mr. Vaughan worked for the Middlesex District Attorney’s Office and as a summer associate for Keegan Werlin. Mr. Vaughan received his Bachelor of Arts in political science, cum laude, from Salve Regina University in Rhode Island. At Salve Regina University, he was a member of the Pi Sigma Alpha National Political Science Honor Society and a Chi Alpha Sigma National College Athlete Honor Society Honoree. He brings a wide berth of experience to the firm; before joining the firm in 2016, Mr. Vaughan practiced law at Campbell Campbell Edwards & Conroy, handling civil litigation matters, and Northern LNG LLC, a small energy start-up. Education Boston College Law School, Boston, Massachusetts, J.D., 2014 Salve Regina University, Newport, Rhode Island, B.A. Political Science, 2011 Member, Pi Sigma Alpha National Political Honor Society; Honoree, Chi Alpha Sigma National College Athlete Honor Society

Ms. Pardee received her Juris Doctor and Master of Energy Regulation and Law from Vermont Law School. While attending law school, Ms. Pardee participated in the Energy Clinic and Moot Court, and was also a Research Associate with the Vermont Law School Institute for Energy and the Environment. Energy & Regulatory Law; Public Utilities Sarah Pardee is an associate attorney at Keegan Werlin LLP, specializing in energy, regulatory, and public utility law. Sarah Pardee Phone: 617-951-3773 Email: spardee@keeganwerlin.com ● Regulatory Law ● Energy Law ● Public Utilities Bar Admissions Connecticut Ms. Pardee received her Juris Doctor and Master of Energy Regulation and Law from Vermont Law School. While attending law school, Ms. Pardee participated in the Energy Clinic and Moot Court, and was also a Research Associate with the Vermont Law School Institute for Energy and the Environment. While at the Institute for Energy and the Environment, Ms. Pardee co-authored the article How Virtual Power Plants Can Advance Electrification and Mitigate Infrastructure Needs As We Race to Meet Our Climate Challenges, San Diego Journal of Climate & Energy Law (2022). Prior to joining the firm, Ms. Pardee worked at Eversource Energy in the Regulatory Projects division, concentrating on proceedings related to renewable energy, electric vehicles, energy affordability, reliability and resilience, and rate adjustments. Education B.S. 2018, University of Vermont J.D. 2023, Vermont Law School MERL 2024, Vermont Law School

Matthew (“Matt”) Campbell focuses on energy and administrative law, with particular experience advising clients on complex regulatory and policy matters. He represents regulated entities in proceedings before state agencies, where he assists clients in navigating evolving regulatory frameworks, compliance obligations, and enforcement issues. Energy & Regulatory Law Matthew ("Matt") Campbell focuses on energy and administrative law, with particular experience advising clients on complex regulatory and policy matters. Matthew Campbell Phone: 617-951-1400 Email: mcampbell@keeganwerlin.com ● Energy Law ● Regulatory Law Bar Admissions Massachusetts New Hampshire Washington, D.C. He represents regulated entities in proceedings before state agencies, where he assists clients in navigating evolving regulatory frameworks, compliance obligations, and enforcement issues. Before joining Keegan Werlin, Matt served as Senior Legal Counsel at Unitil, where he advised leadership on regulatory strategy, compliance, and contract matters across Maine, Massachusetts, and New Hampshire. Matt also brings significant public-sector insight from his tenure as Chief of Staff at the Massachusetts Department of Public Utilities, where he advised the Commission on policy, legislation, and agency operations, and served as a primary liaison to state leadership and industry stakeholders. Earlier in his career, Matt worked extensively in the energy industry in strategic, analytical, and consulting roles, supporting major transactions, privatization efforts, and regulatory filings across the utility sector. Matt earned his J.D., magna cum laude, from New England School of Law, where he served as Technical Editor of the New England Law Review and received multiple academic honors. He holds a B.A. in English from the University of Massachusetts Amherst. He is admitted to practice in New Hampshire, Massachusetts, and Washington, D.C. Education New England School of Law, Boston, Massachusetts, J.D. University of Massachusetts Amherst, Massachusetts, B.A. English