Unitil Corporation is a regulated utility holding company that owns and operates five distribution utilities serving customers across New Hampshire, Massachusetts, and Maine. The company generates revenue primarily from electric distribution (approximately 44% of revenue) and natural gas distribution (approximately 56% of revenue), with smaller contributions from natural gas transmission operations. Unitil's utilities distribute electricity and natural gas to residential, commercial, and industrial customers under cost-of-service regulation, allowing recovery of operating costs and a reasonable return on capital investment; customers in certain markets can purchase supply from competitive providers while Unitil's utilities remain the distribution company. The company also operates non-regulated subsidiaries providing administrative services, property management, and real estate leasing to its operating utilities.