Network Tasman manages peak loads by progressively switching off available interruptible load via signaling devices installed on the network and at consumer premises. Interruptible load is beneficial to Network Tasman.
Interruptible load devices are put in place under agreement with consumers and in return, NTL offers lower network tariffs and minimum service levels for each type of interruptible load. The primary example of interruptible supply on NTL's network is controllable hot water heating devices.
The graph in the footer of the Network Tasman website shows the level of load control effect currently deployed by Network Tasman.
The load control graph is updated every 5 minutes or so.