The Manx Utilities Authority says a lack of Manx rain has meant a drop in green energy on the Island.
In Tynwald this week, MUA chairman Dr Alex Allinson was asked about the output of Sulby's hydroelectric plant.
Douglas North MHK David Ashford queried how much energy had been generated in the past two years.
Dr Allinson revealed output had dropped more than 30 per cent from 4,213.5 megawatt hours down to 2,889.5 last year.
He said the drop was solely due to a lack of rainfall.
Popular beer festival starts this afternoon
Popular agricultural show wants your feedback on the event
MU seeking contractor to store emergency water
RNLI applies for new lifeboat station in Douglas
Company's advice on how to talk to children about Roblox
Over 2,000 on incapacity benefits in past year
Decision on Summerland temporary car park plans next week
Island features in Grand National video