A £100m pot set aside to boost Scotland's renewables industry is languishing in Government coffers because of a dispute over funding.
Last year, SNP ministers vowed to ensure the cash was handed over to the Scottish Government to help increase wind and wave power. But the money is still being held by energy regulator Ofgem, denying the renewable industry massive investment.
Labour MPs last night hit out at SNP ministers, claiming they had reneged on their vow to secure the funding. But the SNP Government blamed Treasury rules, which stipulate that for every pound of the fund it takes, it has to surrender another pound from the budget elsewhere.
As a result, the Government has not made an approach to secure the cash.
The money is known as the fossil fuel levy and is paid by suppliers of electricity from non-renewable energy sources. The cash is supposed to then be used to promote renewable power.
But parliamentary questions have revealed that the money is not being used and is simply being banked. The cash set aside for Scotland has swollen from just £18m in 2005-06 to £98m now.
In February last year, Alex Salmond said it was "extraordinary" the money had not been handed over to Scotland. Last September, after taking over as First Minister, he said he was in "negotiations" with Ofgem to secure the funding. But an Ofgem spokesman said it had not received a request for the cash.
A Scottish Government spokesman said: "We are continuing to examine the options for securing the surplus fossil fuel levy funds and we are in contact with both Ofgem and Treasury over this issue."
Labour MP Adam Ingram – who asked the parliamentary questions about the affair – said: "This is another example of a promise made turning into a promise broken."
However, Jason Ormiston, chief executive of Scottish Renewables, said: "I don't think the Scottish Government is to blame.
This goes right across the UK.
"None of (the levy] is being used because of Treasury rules. The benefits could be enormous. It is time the Treasury thought about changing those rules in order to boost the sector."