Hydro power generation in Llangynidr
LEAP has been working to get a micro hydro electricity generation scheme off the ground since 2011. The site of the proposed water turbine and generator is the upper Glaisfer Valley just above Llangynidr.
When it comes into being, the scheme will take advantage of Llangynidr's ample rainfall to generate electricity via the turbine and generator. Electricity will be fed into the National Grid and profits from it will be ploughed back into the community to benefit Llangynidr residents.
The project so far
We've had advice and help from many professionals in getting the scheme going. Here's what's happened to date:
- Feasibility study carried out by The Green Valleys Hydro (TGV Hydro).
- Secured 'agreement to lease' land from Beaufort Estate and the family who own farmland where turbine will be sited.
- Dealt with complications over Forestry Commission 'agricultural use' convenant on the land.
- Calculations on the cost of putting the scheme in place have been worked out (see right).
- We've also calculated how much power / income the scheme will generate (see right).
- TGV Hydro is in the process of securing funds for 'design and permission' stage of the scheme – this stage can take 6-8 months.
Next steps: funding the scheme
Our next challenge is securing the necessary funding for the scheme to go ahead.
We aim to get as much funding as possible from grants and donations before funding the balance via a share offer (to cover 100% of the costs) or via a 50:50 split between share offer and bank loan.
How much power will the scheme generate?
Hydro-turbines convert water pressure into mechanical energy to spin an electricity generator. The power available for generation is proportional to the product of head and flow rate.
The Glaisfer river's flow is 62 litres per second and the head is 51 metres giving a peak output 21kW and an average output of 9kW per annum. This adds up to 77,300 kWh of electricity per annum, the equivalent of enough to power about 17 homes.
See the details of how the power calculation was worked out: flow (62 litres per sec) x head (51 metres) x 10 (gravity) x efficiency (70% or .7) = 21,000 Watts = 21kW - this link explains the calculation in more detail.