Eversource Energy | 80,990 followers on LinkedIn. Eversource Energy (NYSE:ES), a Fortune 500 and Standard & Poor’s 500 energy company based in Connecticut, Massachusetts and New Hampshire, operates New England’s largest energy delivery system. Eversource is committed to safety, reliability, environmental leadership and stewardship, and expanding energy options for its 4.4 million electric and natural gas customers. We are a company dedicated to our customers, communities and employees.