Extra gas supplies were rushed out to the liquefied natural gas importation terminal in Kent through pipelines in Belgium and Norway following the alert.
The National Grid said the risk of shortages had been temporarily averted by the influx. "Supplies of gas to the UK have increased following the issuing of a gas balancing alert today," a spokesman said.
Unusually cold weather is set to continue over the next two weeks, and the National Grid has not ruled out sending out further supply warnings. Read more.