Tex. Util. Code § 11.005

In this title, an entity, including a utility competitor or utility supplier, is considered to be affected in a manner other than by the setting of rates for that class of customer if during a relevant calendar year the entity provides fuel, utility-related goods, utility-related products, or utility-related services to a regulated or unregulated provider of telecommunications or electric services or to an affiliate in an amount equal to the greater of $10,000 or 10 percent of the person's business.