What is a 'Black Sky' event? Why is the UK preparing for a crisis that could paralyse daily life? - The Economic Times
During this kind of event, extreme, prolonged electricity blackout could disrupt essential infrastructure and several services across a large area. The situation can turn very serious. It may not be just some ordinary power cuts. Electricity-dependent systems could stop functioning. The consequences could extend beyond lighting and heating to water supplies, telecommunications, transport.