National Grid says that the Russia-Ukraine war poses a risk to future energy supplies. : Discount offers for households to use less electricity at peak times will return this winter as part of plans to minimise the risk of power cuts. National Grid ESO said it expected to have sufficient capacity to meet demand but added it would be "prudent" to maintain the energy-saving scheme. The network operator said the Ukraine war posed "risks and uncertainties" to gas supplies across Europe and the UK.