The UK could struggle to reach its target of generating 15% of energy from renewable sources by 2020, according to a report submitted to the European Union.
The British Government is also anticipating problems in achieving the interim target for the next six years, according to Reuters.
The country would be able to reach its 15% goal if energy consumption remains at low or moderate levels.
But if demand is higher, the country may not hit its three interim targets, according to the report.
The first three goals are for 4% renewables by 2012, 5.4% by 2014 and 7.5% by 2016.