If you're going to spend tax payer money on public buildings, energy efficiency and solar PV generation would be a good investment of public tax funds. The tax money will go to maintain or power the public building. Any tax money not used every month on electric bills can go to keep costs down and free the already collected tax dollars for the operation of the building and what ever resource it is supposed to provide. Libraries, county buildings, fire houses, police stations, hospitals, schools, courts, all use tax payer money to pay their electric bills with.