Six Scottish windfarms were paid a total of £900,000 to stop producing energy. Energy companies were paid as much as £300,000 each to halt the turbines, which are located at a range of sites across Scotland, for several hours between 5 and 6 April because the grid network could not absorb all the energy they generated. The National Grid said high winds and heavy rain caused the network to overload. The payments were worth up to 20 times the value of the power they would have produced. The events highlight the need for increased energy storage facilities. ITM Power are working on developing hydrogen gas batteries as a storage method to support renewable power generation.