Households have been forced to turn up their heating as the freezing weather continues, pushing the demand for gas to 20% higher than normal in March.
Last night gas stocks were just 10% full, compared to 49% this time last year, it said.
Weeks of unusually cold weather have drained nearly all of Britain's gas supplies, sparking fears of a spike in energy prices.
Households have been forced to turn up their heating as the freezing weather continues, pushing the demand for gas to 20% higher than normal in March.
Last night gas stocks were just 10% full, compared to 49% this time last year, it said.
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