According to an aspect of the disclosure, an energy management apparatus for a mobile energy management system and method includes detecting an availability of at least one network device at a site, displaying a proximity control selector within a graphical user interface of a mobile device associated with the site that can be toggled to enable and disable proximity detection using the mobile device, detecting a distance of the mobile device relative to the site in response to enabling proximity detection on the mobile device, and initiating a change to the operating condition of the network device in response to detecting a change in the distance of the mobile device relative to the site and the setting of the proximity control selector. According to an aspect of the disclosure, the network device may be a thermostat associated with the HVAC system of the site or other energy consuming appliances.