Wind turbines installed at five schools at a cost of £50,000 produced savings of less than £50 in their first year.
The windmills were put up on the primary school rooftops in Fife by the local authority as part of their renewable energy scheme.
However, the pilot project has been riddled with technical problems – one school saved only £1.50 in a year.
Andrew Arbuckle, Lib Dem MSP for Mid Scotland and Fife, said the scheme at Auchtertool, Canmore, Collydean, New Gilston and Largoward primaries was “half-hearted” and a “very poor return” on the investment.
But Fife Council have confirmed they are “committed” to installing renewable energy devices at many buildings.
They also claimed Edinburgh turbine makers Renewable Devices have vowed to supply the schools with upgraded versions when they are launched next year.