Spark Energy is an electricity and natural gas supplier serving over 700,000 consumers across ten states including Texas, California, and Pennsylvania. They offer fixed-rate plans for both residential and commercial customers, with options for 100% renewable electricity and carbon-neutral gas. The company is known for competitive rates and customer service, based on numerous customer reviews praising their bills and support. They would be a natural fit for business owners whose clients are seeking to switch energy providers in deregulated markets, or for referrals to solar installation services through their partner Via Energy Solutions.