, NiSource Inc. Eversource Gas Company of Bay State Gas d/b/a Columbia Gas of Massachusetts D.P.U. 20-59 Attachment LIUNA-ES-1-1 Page 1 of 1 EVERSOURCE ENERGY CORPORATE CHART As of September 12, 2020

EVERSOURCE ENERGY

The Light Yankee Energy System, Inc. Eversource Water Eversource Energy Transmission Eversource NU Enterprises, Inc. (NUEI) and Power Company Gas Businesses Holding Company Ventures, Inc. Ventures, Inc. (EE-TV) Holdco Corporation Unregulated Businesses (dba Eversource Energy) 100% Water Businesses Transmission Businesses Wind Businesses Holding Company Electric Utility Holding Company Holding Company Holding Company 100% 100% 100% 100% 100%

NSTAR Gas Company (dba Eversource Energy) Northeast Generation The Connecticut Steam Company Retail Distribution of Natural Gas Eversource Aquarion Northern Pass Eversource Services Company Inactive 100% Holdings, Inc. Transmission LLC Investment Service Inactive 100% Aquarion Water Businesses Electric Transmission Company LLC 100% Holding Company 100% Construction of Onshore Facilities Eversource Gas Company of 100% for Bay State Wind Electric Power Incorporated Massachusetts 100% Inactive Acquisition Subsidiary for Assets of Renewable Properties, Inc. NGS Sub, Inc. 100% Columbia Gas of Massachusetts Real Estate Inactive 100% Aquarion Company 100% Eversource 100% Intermediate Holding Company Investment LLC (EI) The Nutmeg Power Company 100% Holds Eversource Investment in Bay State Wind Inactive Hopkinton LNG Corp. Eversource LNG 100% 100% Liquid Natural Gas Storage Service Company LLC IP Strategy LLC 100% Holding Company Intellectual Property Rights Aquarion Water Company 100% Holding Company Holding Company for Water Utilities and 100% BSW HoldCo LLC Public Service Company Yankee Gas Services Company Unregulated Subsidiary of (dba Eversource Energy) 100% Eversource Gas 50% Held by EI 50% Held by Ørsted (dba Eversource Energy) Retail Distribution of Natural Gas Transmission LLC (EGT) Electric Utility 100% Holding Company North Atlantic Energy Corporation 100% 100% Inactive Aquarion Water Company 100% of Connecticut BSW ProjectCo LLC Eversource Energy Service Company Public Water Supply Utility Eversource Gas JV Project Company 100% 100% Properties, Inc. System Service Business Transmission II LLC (EGT II) Northeast Nuclear Real Estate 100% Holds Eversource Investment Energy Company 100% in AIM Project Inactive Aquarion Water Company 100% 100% of Massachusetts, Inc. Bay State Holdco LLC The Rocky River Realty Company Public Water Supply Utility 50% Held by EI PSNH Funding LLC 3 Real Estate 100% 50% Held by Ørsted Issue of Rate Reduction Bonds 100% North Atlantic Energy 100% Algonquin Gas Service Corporation Transmission LLC Inactive Aquarion Water Capital HWP Company EGT II 15% Class C 100% of Massachusetts, Inc. Bay State Wind LLC Real Estate Member Interest Lease Holder for Water NSTAR Electric Company 100% for Algonquin Incremental JV Lease Company (dba Eversource Energy) Treatement Plant Market (AIM) Project 100% 100% Electric Utility 100% Connecticut Yankee Atomic Power Company Aquarion Water Company Alps to Berkshire LLC Northeast Wind Energy LLC Owns and Maintains Site of of New Hampshire, Inc. Decommissioned Nuclear Generating JV Entity to Develop 50% Held by EI Public Water Supply Utility Harbor Electric Station Clean Energy Connect 50% Held by Ørsted 100% Energy Company CL&P 34.5% EE-TV 50% Electric Utility Serving the NSTAR Electric 23.5% MA Water Resources Authority PSNH 5% North East Offshore, LLC 100% 50% Held by EI Homeowner Safety 50% Held by Ørsted Maine Yankee Atomic Valve Company Power Company Warranty Services Business Hydro-Transmission Owns and Maintains Site of 100% Electric Company Decommissioned Nuclear Generating Deepwater Wind New York, LLC DWW MARI Holdings, LLC Deepwater Wind, LLC Eversource Energy 22.66% Station CL&P 12% 100% 100% 100% NSTAR Electric 14.5% Holding Company Holding Company JV Project Company (7.9% Voting) NSTAR Electric 7% PSNH 5%

Deepwater Wind Operating, LLC New England Hydro-Transmission Sunrise Wind LLC Deepwater Wind South Fork, LLC Corporation Yankee Atomic 100% ElectricCompany 100% 100% JV Project Company Eversource Energy 22.66% JV Project Company JV Project Company NSTAR Electric 14.5% Owns and Maintains Site of (7.9% Voting) Decommissioned Nuclear Generating Station SMRT Line, LLC CL&P 24.5% DWW Rev I, LLC 100% NSTAR Electric 21% 100% JV Project Company PSNH 7% JV Project Company

Deepwater Wind New England, LLC 100% JV Project Company