A system for providing electric energy to users, the system comprising: a server node, a set of supply nodes (131, 132, 13n), each of which is configured to receive electric energy from an external power source and based thereon provide output energy via at least one remote-controlled outlet associated with the node, at least one communication network connecting the server node to each of said supply nodes (131, 132, 13n), and a set of mobile terminals, each of which is configured to communicate with the server node over a wireless interface (185, 380), wherein each node of said supply nodes (131, 132, 13n) is configured to repeatedly send instruction inquiries (IN-INQ1, IN-INQ2, IN-INQn) to the server node, and the server node is configured to: receive activation requests (ACT-REQ1) from said mobile terminals, each activation request (ACT-REQ1) specifying a particular one of said outlets and a user identity designating a user of one of said mobile terminals, check, in response to a received activation request (ACT-REQ1), if the user identity is authorized to activate the specified outlet, and provided that said user identity is found to be authorized send, in response to an instruction inquiry (IN-INQ1) from a first supply node in which the specified outlet is included, an activation accept (ACT-ACC1) to the first supply node, the activation accept (ACT-ACC1) being configured to upon receipt in the first supply node cause the first supply node to enable output of electric energy from the specified outlet, the first supply node comprises: circuitry configured to register an impedance measure in respect of each of its associated outlets, characterized by a first trigger module configured to generate one of said inquiries (IN-INQ1) in response to a registered impedance measure indicative of an electric plug being inserted into a particular one of said associated outlets, the inquiry (IN-INQ1) specifying said particular outlet. a server node, a set of supply nodes (131, 132, 13n), each of which is configured to receive electric energy from an external power source and based thereon provide output energy via at least one remote-controlled outlet associated with the node, at least one communication network connecting the server node to each of said supply nodes (131, 132, 13n), and a set of mobile terminals, each of which is configured to communicate with the server node over a wireless interface (185, 380), receive activation requests (ACT-REQ1) from said mobile terminals, each activation request (ACT-REQ1) specifying a particular one of said outlets and a user identity designating a user of one of said mobile terminals, check, in response to a received activation request (ACT-REQ1), if the user identity is authorized to activate the specified outlet, and provided that said user identity is found to be authorized send, in response to an instruction inquiry (IN-INQ1) from a first supply node in which the specified outlet is included, an activation accept (ACT-ACC1) to the first supply node, the activation accept (ACT-ACC1) being configured to upon receipt in the first supply node cause the first supply node to enable output of electric energy from the specified outlet, circuitry configured to register an impedance measure in respect of each of its associated outlets, characterized by a first trigger module configured to generate one of said inquiries (IN-INQ1) in response to a registered impedance measure indicative of an electric plug being inserted into a particular one of said associated outlets, the inquiry (IN-INQ1) specifying said particular outlet.