When does MainPower control electricity delivered to hot water cylinders?

Like roading networks, electricity networks experience peak times when demand is high and capacity is near the limit. On a roading network, this would look like a rush hour traffic jam.

Peak times on the MainPower network typically occur on cold winter mornings and evenings (when most customers are running heaters, lights, and other appliances at once), or in summer when irrigators and air conditioning are running at full capacity. Hot water cylinders are remotely controlled when the electricity network is experiencing high load.