Sale of the hydro scheme
The Galloway hydroelectric scheme is to be bought by an English power generator.
ScottishPower is selling the Ken-Dee network to Drax to concentrate solely on windfarms.
NorthYorkshire company Drax wants to move into renewable power as tough carbon emission targets loom.
Chief executive Keith Anderson said: “We are leaving carbon generation behind for a renewable future powered by cheaper green energy.”
It is unclear whether the deal will affect existing conservation and flood protection arrangements.
Castle Douglas historian Alistair Livingston said: “The pumping station on Carlingwark Lane manages water flow between Carlingwark Loch and the Dee.
“Farmers were complaining their fields next to the marshes were becoming waterlogged. ScottishPower did look at switching it off in 2004 but agreed not to do it.
“Should it be decommissioned it could mean the marshes between the loch and the Dee being permanently underwater.”
Mr Livingston added: “There is an agreement with the RSPB nature reserve to manage water levels to benefit wildlife. The Galloway Glens is also working with ScottishPower to use the whole system for canoes.The question is whether these arrangements hold.”
The six stations from Drumjohn toTongland can deliver up to 109 megawatts – equivalent to 40 wind turbines.
ScottishPower is also to sell its gas-fired stations to Drax in the mega deal.
Castle Douglas councillor Iain Howie said: “I have been in contact with Drax seeking assurances on job security and the maintenance of the Blackparks pumping station.
“I will be seeking a meeting with them when the transfer is complete.”
A Drax spokesman said: “It’s early days and we haven’t yet completed the acquisition of the ScottishPower assets.
“We would expect to manage the environmental protections and flood defences in a way consistent with previous practices.
“The deal is due to complete at the end of the year, subject to shareholder approval.”