Download vCard

1025 Thomas Jefferson St, NW
8th Floor, West Tower
Washington, DC 20007-5201

202.342.0800 Phone
202.342.0807 Fax

Garrett A. Stone principal

For more than three decades, Garrett Stone has represented large industry-leading companies that have operations and/or products that create the need for specialized expertise related to energy supply and regulation.  Whether such companies are major energy users, suppliers of energy efficiency and/or demand response, or suppliers of actual power and energy, he utilizes his substantial experience and knowledge on both the state and national level to create customized approaches to meet their specific needs.  Since energy production, supply and use are often highly regulated at the state level, a common thread running throughout these matters is the ability to develop solutions specific to each state based on an understanding of the complex legal, technical and regulatory interrelationships in the energy industry, comparative approaches to energy regulation, and the unique issues that apply in a particular location.

Representing very large consumers of electricity and natural gas specifically, Mr. Stone advises and assists these clients in managing their energy supply portfolios, including the terms, conditions, pricing and legal issues related to their supply contracts (whether regulated or not).  This representation includes dealing with all types of energy suppliers and related parties including investor-owned utilities, rural electric cooperatives, natural gas suppliers and pipelines, federal, state and municipally-owned utilities, regional transmission organizations, power marketers and retail suppliers, with the objectives of lower energy costs, reduced risks and improved terms and conditions of service.  Mr. Stone participates in federal and state utility regulatory proceedings, and in appellate cases as necessary, to protect client interests, addressing proposed rate increases, fuel cost review, energy efficiency and demand-side programs, integrated resource planning, restructuring, mergers, renewable energy and other utility issues.

Representing clients related to energy efficiency, primarily in the building industry, Mr. Stone counsels and represents large manufacturers of efficient products, as well as energy efficiency groups and coalitions.  Areas of primary activity include development, adoption, implementation, enforcement and compliance related to model, federal, state and local building, green and energy codes, as well as governmental and utility energy-efficiency-related market transformation programs, like EPA’s Energy Star programs, tax credits, and other programs and standards related to energy efficient products and buildings.

Mr. Stone has spoken at a wide array of conferences and meetings, such as those sponsored by the American Council for an Energy Efficient Economy, the American Public Power Association, the Energy Efficient Building Association, and the National Association of Regulatory Utility Commissioners.  He has also testified before state legislatures and state utility regulatory commissions, the California Energy Commission and at numerous International Code Council hearings.

Building Codes and Regulation

Stone Mattheis Xenopoulos & Brew, PC represents manufacturers of building products and other stakeholders regarding national, state and local building regulation and code issues. This practice includes:
  • Development and advocacy of proposed amendments to and interpretations of model, state and local codes and regulations (such as the International Building Code, and International ...
Read more about the Building Codes and Regulation practice »

Electric and Natural Gas Utility Law

Stone Mattheis Xenopoulos & Brew, PC represents wholesale and retail buyers of electricity and natural gas in determining optimal energy strategies, in contract and transactional matters, and in litigation before federal and state courts and agencies. Our firm has an established reputation for skillful, creative, and aggressive advocacy of its ...
Read more about the Electric and Natural Gas Utility Law practice »

Energy Efficiency

Stone Mattheis Xenopoulos & Brew, PC represents manufacturers of energy efficient products and other stakeholders regarding national, state and local energy efficiency issues. This practice includes:
  • Development and implementation of overall strategic plans for product technical marketing
  • Advice and representation regarding product energy efficiency testing, certification and labeling
  • Development and advocacy of proposals ...
Read more about the Energy Efficiency practice »


The firm has decades of proven litigation and trial experience spanning numerous disciplines and in multiple venues – administrative, trial court and appellate. In the regulatory arena, firm attorneys have extensive trial experience at both the state and federal levels related to energy and other issues before administrative agencies. At the ...
Read more about the Litigation practice »

Public Policy and Law

Stone Mattheis Xenopoulos & Brew, PC offers its clients government relations services. On behalf of the firm's cooperative, public power, and industrial clients, we monitor and assist clients in participating in legislative and regulatory developments that may impact their operations on the federal and state levels, with a special emphasis on ...
Read more about the Public Policy and Law practice »