Abstract: A building automation system having: a plurality of wireless remote devices, each wireless remote device including a wireless transceiver for transmitting and receiving digital information and an interface for energy management which can read a sensor, such as a temperature sensor, a flow sensor, an electronically readable gas or electric meter, or provide an output, such as a relay driver; and a controller having a wireless transceiver for digital communication with the wireless remote devices and a computer interface. Each wireless remote device includes an identifier to identify the type of interface present in the remote device and a serial number to allow the controller to communicate exclusively with any individual remote device. The controller interface allows the controller to communicate with a computer, and ultimately with a server to allow monitoring and control of the system from virtually anywhere in the world.