Water wheels producing power were once a common sight on the River Dee
A feasibility study is under way to see if the River Dee could generate power for homes in a Denbighshire town.
The £25,000 study has been partly funded by Llangollen businessman Peter Carol, who says he dreams of cheap, renewable power for his home.
Mr Carol, of Pro-Adventure, said he wanted to "make a difference".
It is hoped the town could benefit from a community-owned hydro-electric scheme which powers 10% of Llangollen's 1,600 homes and businesses.
Mr Carol donated £9,000 to the scheme - 1% of his outdoor pursuit company's turnover for the last two years.
He said: "We've always wanted to make a difference and our business had grown to the stage where we felt it was time to make a public commitment and we decided to put one per cent of our turnover to environmental projects."
Mr Carol's donation led to the project drawing additional funding from rural development agency Cadwyn Clwyd and Denbighshire Council.
Silas Jones, of Cadwyn Clwyd, said: "It is a speculative project but the ultimate aim would be to see a community-owned hydro power project generating revenue income and renewable energy."
He added: "Certainly it could be possible to generate 10% of the town's power in 10 years' time."