No later than July 31, 1978, the commission shall develop design guidelines for new construction which include energy conserving options, including, but not limited to, the use of daylighting, heating ventilation and air conditioning economizer cycles, natural ventilation, building envelope solar heat gain control mechanisms, and alternative energy systems such as solar energy for space heating and water heating and load management strategies. These guidelines and the cost analysis done pursuant to Section 25494 may be considered by government agencies at their option for ultimate selection of a building design in the competitive bidding process.