Deputy Prime Minister Nick Clegg is set to deny splits within the coalition Government over carbon emissions reduction, as he announces a £100 million investment in energy efficiency.

Speaking to an energy conference in London's Lancaster House, Mr Clegg will say that ministers are "unreservedly committed" to helping the low-carbon sector thrive, insisting that "no-one in Government" wants to depart from the programme to decarbonise Britain's economy as part of the fight against climate change.

Mr Clegg will tell an audience of business figures that the UK is "leading from the front" in a global revolution towards cleaner sources of energy.

He will announce a £100 million contract by UK Green Investments with fund managers Equitix and SDCL to provide initial funding to encourage foreign and domestic investment in non-domestic energy efficiency.

And he will hail the announcement by recycling firm Closed Loop of a £12 million expansion of its plastics purification plant in Dagenham, east London, which is expected to create and safeguard 100 jobs.

Many environmentalists were dismayed by Chancellor George Osborne's comment to last year's Tory conference that, while the Government would invest in green energy, "we're not going to save the planet by putting our country out of business".

And the Treasury is understood to have demanded cuts of 25% in subsidies for onshore windpower in a tussle between Mr Osborne and Liberal Democrat Energy Secretary Ed Davey, which ended last month with a 10% cut but question marks hanging over the 2030 target for decarbonising the economy.

Mr Clegg will play down the spat as part of the "internal discussions and debates on the balance and sequencing of different policies" that are a normal feature of any government.

Mr Clegg will say that ministers recognise the industry wants "predictability" and "consistency" from the Government on low-carbon energy policy. And he will insist that the coalition remains "bold" in its ambition for a "clean, green, low-carbon economy".

The conference will also hear of plans by Spanish company Grupotec to expand its solar energy operations in the UK, creating nine jobs in Richmond, Surrey, and by Power Electronics to open a UK headquarters in Reading, Berkshire, creating four jobs.

The Press Association, photo by Liberal Democrats