Trusted Energy Saving (TES) methods applied to server based distributed downloadable gaming for allowing casino operators to significantly reduce their energy bills by placing the main controller of selected unused gaining machines into low-power mode while retaining total control and trust. Trusted Energy Saving is accomplished by: (1) establishing a secure “out-of-band” communication (or equivalent) between gaming machines and the casino's management system such that full network security is maintained while the main controller is in low power standby mode, (2) employing intelligent strategies to wake-up and turn-off the main controller of selected gaming machines by anticipating player use, (3) waiving the lengthy security verification required by regulation upon every gaming machine start-up and optionally (4) by displaying video promotional content on each turned-off gaming machine to continue to attract prospective players and to use the timing of each player approach to intelligently structure game menus based on the promotional content that has successfully attracted the player. The mapping of the TES gaming machines that are turned-on and in low-power mode may be periodically forwarded to the air-conditioning management system and/or to the lighting management system for energy optimization.