Headquartered in Houston, Gexa Energy is the retail electricity provider of Texas. Since its inception in the early 2000s, the company has catered to residential and commercial customers alike. Gexa Energy is best known for its 100% renewable energy plans. After all, it is a subsidiary of NextEra Energy Resources, which is the largest provider of wind and sun energy in the continent. It is worth noting that the company offers discounts to all customers who sign up with a Gexa Energy promo code.