WINDFARMS last month produced enough electricity to power more than 1.7 million homes in Scotland - representing a 120 per cent year on year increase.

Environmental groups expressed surprise that turbines north of the Border provided 620,144MWh of electricity to the National Grid, because output generally falls during summer.

The charity WWF said the latest figures show the turbines had generated the equivalent of 33 per cent of the country's entire electricity needs for the month of June.

It based the figures on analysis provided by the website WeatherEnergy which monitors windfarm outputs.

WWF said that in June 2014, wind energy provided 281,735MWh.

Scotland's total electricity consumptin, ncluding homes, business and industry, for June was 1,891,536MWh.

For homes fitted with solar PV panels, the analysis found there was enough sunshine to generate an estimated 109per centof the electricity needs of an average household in Aberdeen, 105per centin Edinburgh, 98per centin Inverness, and 89per centin Glasgow.

For those homes fitted with solar hot water panels, there was enough sunshine to generate 99per centof an average household's hot water needs in Aberdeen, 94per centin Edinburgh, 90per centin Inverness, and 87per centin Glasgow.

WWF Scotland's director Lang Banks said: "While much of the attention may have been focused on the welcome summer sunshine, June also turned out to be an astonishing month for wind power in Scotland.

"Thanks to a combination of increased capacity and stronger winds, output from turbines more than doubled compared to the same period last year - supplying power equivalent to the electrical needs of 1.7 million homes.

"These figures show just how much wind power has gone from strength to strength. However, wind power in Scotland could and should be playing an even bigger role in helping to reducing climate emissions from the power sector.

"We therefore hope that the forthcoming Government onshore wind summit can find ways forward to help ensure this clean energy source can meet its true potential."

WeatherEnergy spokeswoman Karen Robinson said the summer often sees a dip in the amount of power generated by windfarms.

She added: "This June saw a massive jump in output when compared to last year. While the data confirms Scotland is knocking out of the park on wind power, it also confirms it's no slouch when it comes to solar power too."