Linton Lock Hydropower

A recent hydropower scheme that we commissioned  is up and running and is situated at Linton Lock on the River Ouse between York and Harrogate. The Archimedean screw is particularly suitable for locations like Linton Lock, which is on an important salmon river and popular with fishermen, as it’s an exceptionally fish-friendly method of generating power.

On route to Linton Lock

An Open Compact Archimedean Screw was designed for this project. An Open Compact is a self-supporting U-shaped steel construction minimising necessary civil work on site. The generator unit is an integral part of the construction, easily accessible via a weatherproof, hinged generator cover.

The length and diameter of an Archimedean Screw will be dictated by the parameters of the particular site and are finished in the colour of your choice. All Archimedean Screws are manufactured as bespoke installations.

The Weir at Linton Lock

Rated at 100 kilowatts the hydro turbine is predicted to save in excess of 226 tonnes of Carbon Dioxide (CO2) annually. The predicted annual output is 525,600 kilowatt-hours. To put this in perspective, an average household uses less than 5,000 kilowatt-hours per year, so this hydro scheme has the potential to power more than 100 houses in the locality.

The Sluice Gate

Mann Power Consulting Ltd., the UK based Archimedean Screw specialists designed the equipment for the Linton Lock project and it  was manufactured by Landustrie based in Holland.

The installed Archimedean Screw

In comparison with most turbines the Archimedean hydropower screw makes use of an open construction and a low rotational speed. This results in a natural flow and there is no pressure build up in the entire installation. Furthermore extensive testing shows that due to the size of water chambers and the fact that there is no pressure difference fish will pass through unharmed. The Landy hydropower screw makes use of a specially designed inlet and outlet that make the screw absolutely fish friendly. The water outlet is designed in such a way for the water (and fish) to smoothly exit the screw without splashing. This also reduces the noise that water creates.

 All photographs copyright of  Eco Evolution.




Latest tests confirm increased energy generation of Evance small wind turbine

During the last few months the Evance R9000 small wind turbine has undergone further tests which have confirmed its energy generation has increased by over 4% to 9,167kWh at a wind speed of 5 metres per second.

The R9000 5kW turbine was one of the first small wind turbines to be fully certified under the Microgeneration Certification Scheme (MCS) in July 2010, and since then has received system improvements.

Evance R9000 installed in Wexford

Many Evance customers have already benefitted from higher than expected energy generation as the R9000 system improvements were implemented several months ago. For example, Clive Breeze was pleasantly surprised with the energy generated from his recent installation: “Inthe first three weeks alone, the R9000 turbines exceeded the predicted energy generation targets by 10 percent and the first quarterly electricity bill showed a reduction of over £300 per month.”

Annual Energy Yield vs Annual Mean Wind Speed


Average Power vs Wind Speed


We’re delighted that our R9000 turbine is proving so efficient in energy production as this translates directly into a faster return on investmentfor our customers,” said Kevin Parslow, CEO of Evance Wind Turbines. “We design and manufacture our turbines here in the UK, so our customers are quick to benefit from any improvements that we make.

Our R9000 machine accounted for a third of all small wind turbines sold in the UK last year – making it the UK’s small wind turbine of choice. We look forward to maintaining our leadership position as we continue to develop our renewable energy system offerings,” concludes Kevin.


Local school bottles it!

Over the past few months the children of Scoil Naomh Maodhóg in Ferns, Co. Wexford have been busy collecting two litre plastic bottles to construct their latest eco-friendly project. The bottles have now found a new lease of  life as the school’s eco-friendly greenhouse.

Plastic bottle greenhouse

Preparing greenhouse for vegetable planting

The lids and labels were removed and the bottoms were trimmed to allow them to slot into each other to create a long tube. The tubes were then stacked side by side and secured into the timber  frame with wires spaced at intervals up the frame and roof.  The wires hold the bottle in place and it is the cross tie wire that binds it into a solid wall, closing most of the gaps.

This is the perfect project for schools as it is a great re-use educational structure that really works.

The school has a ‘green’ ethos that is to be admired and is working towards becoming a more environmentally friendly and sustainable school.  School projects to date include the creating of  raised flower and vegetable beds, wildlife garden and pond, a  newly planted woodland area, the erection of bird boxes, butterfly boxes and an insect hotel that are all tended by the children. They make their own compost and water the plants with the rainwater they collect.

Cold frame protecting the young plant

Coldframe made from old windows

The children are introduced to growing their own vegetables. They plant the seeds and wait patiently for them to germinate.  They are then planted out when weather permits and  each class take turns to water and keep them weed free. There is great excitement when its time to harvest the produce as they get to divide it and bring it home.

Last year the potatoes were harvested and the children cut them into chips. They were then brought to the local diner to be cooked. A very tasty meal was had by all!

Planting potatoes in one of the many raised vegetable beds

Pond and wild flower garden

A  long side the pond the children have planted a variety of nectar producing plants and shrubs to encourage butterflies and other nectar loving insects into the garden. Rough grass margins have also been successfully established and this provides an excellent habitat for many insects and is ideal for the newly-emerged frogs that are a great attraction for the children every year.

Native tree nursery

Last year the school  began the task of extending the existing Woodland area. It was decided to plant only native species to the area  so the children brought in tree sapplings from their own gardens and created a nursery. When they were strong  enough they were planted out in the well prepared area. Their aim is to create natural habitats so as to introduce various insects, butterflies and birds into the school grounds. The children have great fun walking through the Woodland, turning up stones and wood to see what insects are lurking beneath.

Newly planted woodland area


Mature woodland area rich in biodiversity


Birdboxes are placed in safe areas to attract birds to the school grounds


Butterfly boxes

Last year a Tidy Towns Junior Committee was formed. They are a great asset to the community as they are involved in keeping the school litter free, promote energy efficiency and recycling and reusing in the school. They were also involved with the development of the Community Park.  They were presented with an Endeavour Award  in recognition of their great work and achievements. They are busy planning some very exciting projects at the moment which are so top secret thet they won’t even divulge the details to the Ferns Tidy Towns Committee. May just watch this space!

Sensory garden and hopscotch area

Picnic Area in the Community park

Members of Junior Tidy Towns enjoying the end of year party organised by Ferns Tidy Towns Committee.

Junior Tidy Towns receiving their well deserved Endeavour Award

It is one of the most energy efficient schools in the area. Over the years the school has taken on projects such as upgrading their insulation, installing new windows and replacing incandescent light bulbs with energy saving light bulbs. The children have a great awareness of energy saving. Simple measures like turning off lights and closing doors when leaving a room help to conserve energy.


Fish-friendly Hydro for Omagh – Part II

Omagh District Council has recently commenced work on a hydro project utilising the weir on the Camowen River, adjacent to Omagh Leisure Complex, to generate electricity through an Archimedean Screw hydro turbine. The development of the hydro scheme on the Camowen River will generate sufficient power to meet the needs of Omagh Leisure Complex with excess electricity sold back to the national grid.

The Archimedean Screw arrived early on Friday morning by ferry from Germany.

Arrival of Archimedean Screw to site

Rated at 121 kilowatts the hydro turbine is predicted to save in excess of 133 tonnes of Carbon Dioxide (CO2) annually and will make a major contribution to the Council’s green philosophy. This project will complement the Council’s initiatives to develop ‘green’ energy from renewable sources, including the installation of a biomass boiler at Omagh Leisure Complex. The revenue generated by the electricity from the hydro scheme will be contributed to a sustainability fund, which would become a resource to support other sustainability projects in the district.

The Council was very conscious of the importance of the Camowen River as a fishery, and of the concerns of anglers. After various consultations it was decided that the most suitable turbine for the site was an Archimedean Screw. The Archimedean Screw turbine provides a fish-friendly alternative to conventional turbines, ideally suited to low-head (1m-10m) sites, and sites with fish protection issues.

The 220 tonne crean lifting the turbine into place


Lifting the turbine into place


Archimedean Screw craned into position


Bolting the Archimedean Screw securely into position


The Archimedean Screw in position

The site has seen many changes over the past few weeks. Safety screens and handrails have been installed. Landscape work is almost complete and it is  is expected that this project will be commissioned and fully operational in the coming weeks.

Safety screens in place

Handrails in place

Project near completion

Hydro projects in Northern Ireland:

This Hydro project is the second of only two Archimedean Screw Hydro projects to date in Northern Ireland. Eco Evolution and Mann Power Consulting are installing both turbines. Mann Power Consulting based in Yorkshire are the pioneers of the Archimedean Screw in the UK and Ireland and Eco Evolution  are their authorised representative for the whole of Ireland.

The first ever Archimedean Screw generator in Northern Ireland was only recently installed at Shane’s Castle in Antrim. Rated at 214 kilowatts this is the largest single Archimedean Screw generator ever manufactured. Eco Evolution and Mann Power recently installed the massive Rehart manufactured machine at Shane’s Castle. It is now fully commissioned  fully operational.

The predicted annual output is a massive 1,125,000 kilowatt-hours. To put this in perspective, an average household uses less than 5,000 kilowatt-hours per year, so this hydro scheme has the potential to power more than 225 houses. This scheme will also save an impressive 840 tonnes or more of Carbon Dioxide (CO2) emissions by generating clean, green electricity.

Fish-friendly Hydro

Eco Evolution and Mann Power together offer an unrivalled level of expertise and experience when it comes to the Archimedean Screw hydro turbine. Between us we have carried out well over 120 feasibility studies on low head hydro sites and have completed over 55 scheme designs. We also provide solutions for old mills that want to retain the traditional water wheel with a number of projects completed and operational with the old water wheel redesigned and refurbished or with a new water wheel manufactured.

Eco Evolution, as well as being involved in the relatively large sized projects in Omagh and Shane’s Castle in Antrim where the largest ever manufactured Archimedean Screw hydro generator of 214 kilowatts has been installed, are also currently working on a smaller 20 kilowatt private scheme in Co. Antrim that will shortly be submitted for planning. This scheme is situated on a farm and will generate an estimated 65,000 kilowatt-hours (or units of electricity) per annum with a  Carbon Dioxide (CO2) emissions saving of over 40 tonnes. A small scheme like this would be capable of powering approximately 15 average households.

Eco Evolution also have two schemes planned on the river Slaney, the famous salmon and trout river in Carlow/Wexford that is also a Special Area of Conservation, one of these recently received planning approval and the other is currently in the planning process. The Archimedean Screw has made hydro schemes possible on rivers such as the Slaney when proper mitigation is implemented. In fact hydro schemes can, and have, enhanced and improved fish passage and migration on many sites that  Eco Evolution and Mann Power have been involved in.

Microgeneration Certification Scheme (MCS) Certification:

With regard to Microgeneration Certification Scheme (MCS) Certification, Mann Power are registered under the scheme as Transition Installer 109. Note however that the Department of Energy and Climate Change (DECC) in the UK recently announced that they are proposing to withdraw the exclusive link between micro hydro and the MCS for the purpose of the Feed-In Tariff eligibility as they have recognised that there is a case to treat micro hydro differently due to the special and complex nature of micro hydro development. DECC will consider how this can be taken forward as part of comprehensive review of the Feed-In Tariff.

Incentives and funding available in Northern Ireland:

Incentive payments in way of Northern Ireland Renewable Obligation Certificates (NIROCs) are available for renewable generators including hydro. NIROCs are available for the electricity generated by the hydro turbine, this electricity can then be used on site with the excess exported to the national grid. There is an Export Tariff available for any excess electricity that is exported to the national grid.

Funding may be available for hydro projects through the Rural Development Programme (RDP). The RDP aims to improve the quality of life in rural areas by supporting a wide range of projects. These include diversification into nonagricultural activities, support for business creation, encouragement of tourism activities, village renewal and development, basic services for rural communities and conservation and upgrading of the rural heritage. The RDP is delivered by seven Council Clusters using the LEADER approach, these Council Clusters have facilitated the creation of Local Action Groups (LAG’s), which cover all sectors of the community. If you would like to find out more about what is available in your area please contact your LAG or your local DARD office. All details available online at

The Eco Evolution professional team offers a friendly one-stop shop for hydro development, from feasibility studies to licensing, to installation and commissioning and everything in between.

Fish-friendly Hydro for Omagh – Part I  The development of the site on the Camowen river.

All photographs copyright of Eco Evolution.

Romney Weir is turning the screw on CO2

Romney weir is turning the screw on CO2. Two Archimedean Screw hydro turbines, rated at 150kW each and designed by Mann Power Consulting Ltd., are to be installed on the weir to generate clean, green electricity that will be used locally.  With a total capacity of 300kW this will be one of the largest Archimedean Screw hydro schemes installed to date in the UK and Ireland. The largest single screw was recently installed at Shane’s Castle in Northern Ireland, rated at 214kW it is the largest ever manufactured Archimedean Screw hydro generator and was designed and supplied by Mann Power .

Romney Weir ‘A’ is in Windsor. The weir was built in the 1790’s and is used to control water levels between Old Windsor lock and Boveney lock. The Romney Weir hydro scheme will utilise just two of the ten existing weir bays and have little effect on current weir operations. Weirs were originally built to control water levels for navigation and flood risk purposes but can now take advantage of new technology to provide energy.

Romney Weir

To help ensure the £1.7million project both generates clean energy and improves the local environment the old Denil type fish pass will be replaced with a Larinier style fish pass which will enable over 12 species of fish including trout and perch, as well as endangered eels, to migrate up this stretch of river,  some for the first time in over 200 years.

The scheme will be fitted with a number of environmental protection measures including rubber bumpers on the turbine blades to minimise risk to fish.

A  four metre flood gate will also be linked to the scheme and will open automatically when river levels are high to ensure there is no increased risk from flooding

Pile driving completed at Romney Weir

The project, which was granted planning permission in August 2008, will consist of two four meter diameter Archimedes screw type turbines occupying two bays in the Romney Weir and will generate 300 kilowatts per hour at peak times, enough to power  600 households. It is estimated the turbines will reduce carbon dioxide emissions by 790,000 kilos per year. This clean, green electricity will be used to power Windsor Castle.

The two 150kW turbines at the Landustrie factory

Mann Power Consulting Ltd., the UK based Archimedean Screw specialists designed the equipment for the Romney Weir project.  After various consultations it was decided that the most suitable turbine for the site was an Archimedean Screw Hydro Turbine which was manufactured by Landustrie based in Holland. The Landy screws are four meters in diameter, 6 meters long and each has the capacity of 150 kW. A unique feature of each screw is the number of blades or helices; here being 5 instead of usually 2 or 3. This is the first five bladed Archimedes Screw Hydro Turbine to be installed in the world to date.

Dave Mann visiting Landustrie in Holland


The turbines on route to Romney

The two 150kW Archimedean Screw turbines arrived on site in the early hours of Wednesday morning 7th September 2011.

The two turbines in the compound awaiting installation


Turbine floating to the weir on a pontoon

Installing the Archimedean Screws

The two Archimedean Screws installed on Romney Weir

The golden brown colour of the turbines and their housings were chosen by the residents of Eton, who look out onto the weir.

The turbines in-situ at Romney Weir

Sluice gates and Larinier Fish Pass

Four Hydraulic Rams have been installed to automatically move and adjust the two 94 tonne turbines as the river level changes.

Hydraulic ram being craned into place


The two hydraulic rams in-situ


Commissioning of the scheme is expected to take place in the coming weeks.


The fish-friendly Archimedean Screw hydro turbine.

 The Archimedean Screw turbine provides a fish-friendly alternative to conventional turbines, ideally suited to low-head (1m-10m) sites, and sites with fish protection issues. Extensive fish passage tests have conclusively demonstrated that the large water chambers and slow rotation of the Archimedean Screw allow fish of all sizes, and debris, safe passage through the turbine. As a result, the Environment Agency has agreed that no screening is required. Literally thousands of fish passages have been monitored and recorded using underwater cameras at the intake, inside the chamber of the Screw itself and at the outflow to assess the effect of the Screw on salmonids (including smolts and kelts), brown trout and eels. The trials looked at fish passage across a broad spectrum of sizes and turbine speeds, possibly the most impressive of which was the safe passage of a kelt measuring 98cm in length and weighing 7.6kg. In addition, behavioural and migrational patterns across the species have been shown to be entirely unaffected by the turbine.

Dave Mann commissioned the fish passage studies instrumental in persuading the Environment Agency to accept the technology. Mann Power have a proven track record of successful installation throughout the UK and Ireland. One of the first challenges presented to Mann Power when Dave Mann set up the consultancy firm in 2003 was to find a hydropower solution for a community project in North Yorkshire, situated in a low head site within a Site of Special Scientific Interest with particular stipulations for the protection of an endangered fish species. The result of extensive research into possible solutions culminated in the introduction of the Archimedean Screw turbine – already widely used in continental Europe – for the first time into the UK, and Mann Power have been at the forefront of supplying this equipment for hydro generation projects since 2004. Mann Power now supplies this equipment throughout the UK and Ireland, as well as providing expert consultancy services.

Dave Mann, a member of the British Hydropower Association Council, has been instrumental in the design, installation and commissioning of all but a few of all Archimedean screw power generation sites in the UK and Ireland to date with over twenty schemes fully operational and a further forty or so at various stages of development. Mann Power have commissioned several independent studies to verify the Archimedean Screw’s fish-friendly credentials and also its efficiency. Mann Power is established within the national hydropower industry as a leader in the field of designing bespoke hydro-generation installations, specialising in low head and ‘difficult’ sites which previously may have been considered unsuitable for such applications.

Eco Evolution work in colaboration with Mann Power Consulting on hydro sites throughout the island of Ireland and the UK.

We also design modern water wheels for electricity generation.


All photographs copyright of Mann Power Consulting and Eco Evolution.