Texas Government Code - GOV'T § 2311.002. Combined Heating and Power Systems

(a) When constructing or extensively renovating a critical governmental facility or replacing major heating, ventilation, and air-conditioning equipment for a critical governmental facility, the entity with charge and control of the facility shall evaluate whether equipping the facility with a combined heating and power system would result in expected energy savings that would exceed the expected costs of purchasing, operating, and maintaining the system over a 20-year period.  Notwithstanding Chapter 2302,  1the entity may equip the facility with a combined heating and power system if the expected energy savings exceed the expected costs.

(b) The State Energy Conservation Office shall establish guidelines for the evaluation under Subsection (a).