Say no to hydro power on the Afon Conwy in the Snowdonia National Park

Archive for ‘March, 2015’

When raising concerns about the proposed hydro scheme SavetheConwy often hears the comment “well it’s better than a coal fired power station”. RWE made a claim at the recent talk about hydropower in Snowdonia that schemes like this would prevent “catastrophic climate change”. SavetheConwy is no fan of coal fired power stations and is fully aware of the problem of man-made climate change. However reduction in carbon emissions must be balanced with damage to local habitats. A coal fired power station would obviously be far more damaging locally and through carbon emissions than the Conwy Falls hydro scheme, but it would also produce far more power. But how much more?

Let us start by making some assumptions:

From the RWE website
“We anticipate the £12m scheme could have a capacity of up to 5 megawatts (MW), and be capable of generating up to 13,000 megawatt hours (MWh) of electricity each year – enough to supply the average annual domestic requirements of over 2,700 households”
Now let’s assume that this power is produced evenly throughout the year when required, not just when it’s lashing with rain on autumn nights. Let us also assume that RWE’s sums are correct for its’ yearly production and won’t be affected by a dry summer or frozen winter.

Now let’s take a coal fired station. The largest in the UK (also with the most accessible published figures is Drax in Yorkshire.
Drax has an installed capacity of 3960 MW but not all this capacity is used full time. In 2013 Drax sold 26.2 TWh to the grid
So Drax produced in 2013 26,200,000 MWh

26,200,000/ 13,000 = 2015.4

Therefore Drax produced over 2000 time more power than the Conwy scheme and not just when it rains.

So yes a hydro scheme is far better than a coal fired power station, but is it 2000 times better?

It is difficult to know how many sections of river there are like the Fairy Glen on the Conwy with the gradient and flow suitable for diverting through a pipe to produce power. You could take this list of rivers
These are all the river sections in the UK thought to have sufficient flow and gradient to be of interest to whitewater kayakers for which the Environment Agency collects flow data. The Conwy Falls or Fairy Glen section of the Conwy is listed amongst them. Some are larger but most are smaller but let us assume the Fairy Glen is an average. There are 173 sections of river on that list.
So if we dammed every section of river in the UK of suitable length and gradient, put the water in a pipe to produce electricity and if the rain fell conveniently and evenly throughout the year. It would still produce less than a 10th of one coal fired power station.

When making judgment on the Conwy hydro scheme we cannot say “but it’s better than a coal fired power station” it is an unfair comparison.
The question should be “is building a hydro scheme on every suitable section of river in Wales, England and Scotland, all 173 of them, 10 times better than one coal fired power station?”

This article is not advocating coal as a suitable fuel for electricity production but simply trying to put the small amount of power that a run of river hydro scheme produces into context. Run of river hydro schemes that lack a large impoundment (reservoir) having no real place in the production of electricity for the grid in the UK. Our rivers are too small with too low and irregular flows to make any real contribution, but mostly the few wild stretches of river that remain untouched are too precious a resource to be squandered in this way.


Election time is approaching and leaflets from prospective MPs are dropping through doors. Do you live in Aberconwy or visit and spend money in the local economy. Write to the local MP Guto Bebb with your concerns. His Twitter feeds shows him firmly behind the scheme but perhaps because he hasn’t heard the concerns of local residents and tourists.

Constituency Office
The Office of Guto Bebb MP
1 Ashdown House
Riverside Business Park
Conwy, LL32 8UB

A local resident of Dolwyddelan sent us a copy of his letter. This letter has been anonymised but don’t forget to include your name and address if you live in the constituency.

FAO: Mr Guto Bebb MP, apropos Conwy Falls hydro scheme

Dear Mr.Bebb,
As a resident of Dolwyddelan I have been growing increasingly concerned about the hydro power project that is being proposed for Conwy Falls. I have seen that to some extent you have supported and passed comments in favour of the scheme, with this in mind I was hoping that you might be able to address some of my concerns.
My umbrella concern is that this is an experimental scheme on a migratory Salmon river in the heart of the National park, treading on a SSSI. RWE’s attempt to compare the Dolgarrog hydro scheme ‘ the Conwy is therefore well proven and reliable for hydro electric power’ is misleading and insulting; one is hanging valley with a controllable head of water, the other a primary migratory salmon river; yes they may be nearby, but they may as well be on different planets in terms of their properties.
The benefits or energy production estimates also appear to be over stated; as the scheme is unable to control when the energy is produced, high water after rain, at midnight on the Conwy will produce power; however, with no means of storage that does not translate into use-able energy. Good for the numbers, useless in terms of real energy to the grid.
This is an invasive and potentially damaging scheme that appears to be supported by misinformation, low carbon does not necessarily mean environmentally friendly. I worry that the Parks, RWE and NRW are using this scheme to bolster their green credentials without truly understanding or acknowledging the repercussions.
My above concerns are fairly broad and do not begin to touch on the ever growing list of concerns: disruption to the A5, large scale development in the National Park, disruption and reduced access to one of Britain’s finest sections of whitewater for canoeing and kayaking, disruption of Otter and fish habitat, the list goes on…
My main questions to you: Who benefits from the scheme? What are the benefits to the local community? What do we stand to lose by allowing this to happen in the National park?
I hope that I may have encouraged you to look a little deeper into this and that you are not merely seeking to bolster your own Green credentials. Schemes similar to this have been in place in North America for some time and they are only now starting to realise the damage that they have caused.


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