Spark Energy, Inc. operates as an independent retail energy services company in the United States. It operates through two segments, Retail Electricity and Retail Natural Gas. The company operates in 94 utility service territories across 19 states, primarily in the Northeast, Midwest, and Southeast regions of the United States. It offers residential and commercial electricity and gas services. The company also provides renewable energy and carbon offset products; and energy efficiency solutions, such as smart thermostats, which allow customers to remotely control their heating and cooling. In addition, it offers services, including customer service, billing and payment, and technical support services. The company was founded in 1999 and is headquartered in Houston, Texas.