The Department of Energy and Climate Change (DECC) said the Government "is never complacent" despite the expectation that there will be sufficient gas and electricity supplies this winter.
A spokesman for the DECC said: "Our infrastructure has the capacity to deliver over twice average winter demand for gas, and has coped well with recent extreme winter conditions.
"Government is never complacent and will work closely with National Grid and the energy industry to monitor the ongoing energy supply situation during the winter months ahead."
Energy UK, which represents energy companies, said investment "is urgently needed" to ensure new power stations can be built as the UK's demand "is getting closer to the amount we can produce or buy in".
Chief executive Angela Knight said, "We have enough energy now but this timely report shows that, as Energy UK has been saying, investment is urgently needed to ensure we build the new power stations we are going to need."
The UK goes into its coldest months with the lowest safety margin against blackouts since 2008.
This year there will be just a 5% margin, the National Grid has said today.
Executives at the energy distribution organisation insist that they will be able to keep the lights on.
They say they have looked at the peak forecast demand and can supply energy to that level - plus a margin they believe is adequate.
Gas and electricity supplies are enough to see the UK through the winter, according to the National Grid's 2013/14 winter outlook report.
Chris Train, the director of market operations at the National Grid, insisted the market could meet demand in cold weather despite the number of power station closures since last winter.
Concern about energy supply has been fuelled by reports that gas stores were driven "dangerously low" during the prolonged cold spell in March.
However the new National Grid report said gas storage has increased since last year.
The National Grid has warned that the difference between gas and electricity demand and available supply is "tighter" than it has ever been, but insisted that the supplies were substantial enough to see Britain through the winter.
The National Grid revealed the UK's electricity margin for 2013/14 was just 5 per cent during peak demand in cold weather - a figure almost half on last year's level.
Chris Train, director of market operations, admitted the margin was "tighter than we have seen historically", but insisted the market could meet demand in the cold weather.