(a) For each project for which a project analysis is prepared under Subchapter D and for which the construction, alteration, or repair involves installing or replacing all or part of an energy system, energy source, or energy-consuming equipment, the commission or the private design professional retained by the commission shall prepare a written evaluation of energy alternatives for the project.
(b) The evaluation must include information about the economic and environmental impact of various energy alternatives, including an evaluation of economic and environmental costs both initially and over the life of the system, source, or equipment.

(c) The evaluation must identify the best energy alternative for the project considering both economic and environmental costs and benefits.