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.




Archimedean Screw Hydro Turbine – Old Technology New Application

The Archimedes Screw has been used for pumping water for over 2000 years. Applying the principle in reverse, the same equipment now offers a new method for generating power from water, providing a fish friendly and highly efficient alternative to a conventional turbine.

Each Archimedean Screw hydropower system is manufactured to be site-specific, with a choice of three designs – steel trough, closed compact and open compact – depending on which is the most appropriate and cost-effective for each individual site.

Closed Compact –  Key Benefits:

  •  Screw + trough + gearbox + generator are all assembled into a single unit at the factory.
  • Civil works on site reduced to a minimum.
  •  Installation time considerably reduced (approx 3-4 hours)

 Open Compact – Key Benefits:

  • Manufactured as a self-supporting U-shaped steel construction minimising necessary civils work on site.
  • Generator unit is an integral part of the construction, easily accessible via a weatherproof, hinged generator cover.

 Steel Trough – Key Benefits:

  •  Concrete foundation cast in situ.
  • Screw is supplied complete with its steel plate trough
  • Backed up with concrete after assembly and alignment.
  • Optimum clearance between trough and screw is guaranteed.
  • Civil works on site are reduced.

Closed Compact

Open Compact

Steel Trough

Eco Evolution are appointed agents in Ireland of Mann Power Consulting Ltd (UK) who specialise in the Archimedean Screw hydro turbine. The Archimedean screw hydro turbines are suited to low-head sites and are fish friendly.

As pioneers of Archimedean screw generating installations in the UK and Ireland, Mann Power believe that Rehart manufacture the best equipment on the market.

Eco Evolution featured in the Irish Independent – hydro electric

  • Hydro electricity — Hydro electric generation — even on a small scale — can be a more cost-effective and, more importantly, predictable and consistent method of generating electricity on both a micro and commercial scale. If you are lucky enough to have a decent size stream running through your farm, it may certainly be worth looking at.
  • Overview of an Archimedean Screw ~ Photo Credit: Landustrie

    Overview of an Archimedean Screw ~ Photo Credit: Landustrie

Co Wexford-based Eco Evolution ( is the agent in Ireland for the Landustrie range of Archimedean Screw hydro turbines supplied by Mann Power Consulting Ltd, the Archimedean Screw hydro turbine specialists in the UK.

Frank Gethings is the MD of the Ferns-based company, which specialises in the micro-generation technologies of wind turbines, Landustrie hydro turbines and solar PV systems. It also supplies and installs solar thermal systems, air-to-water heat pumps and mechanical ventilation with heat recovery (MVHR) systems.

The Archimedean Screw is old technology used as water pumps to lift water from one level to another. Landustrie manufactures two types of the Archimedean Screw, one for pumping water — as originally designed — and the other to generate electricity using the flow of water in the reverse direction, downwards to turn the screw and generate power.

Mr Gethings says: “The requirements for driving the screw are quite low, with a minimum head requirement of just 1m, up to a maximum of 10m. There is a minimum flow requirement of 100 litres/sec, which is the equivalent of a sizeable stream.”

These are said to have many advantages over the more traditional types of hydro turbines; the most important of these probably being the fact that they are fish friendly. Also, leaves and debris simply pass through the turbine with no fine screening required.

“They are also highly efficient across a large flow variation, with a hydraulic efficiency of 87pc and a water-to-wire efficiency of 77pc. They are suitable for small, domestic applications from 1kW up to larger commercial applications of 350kW.

“With each application we would have to do a feasibility study on each site and then the Archimedean hydro-electric plant would be custom-made to suit the site.” Small plants would generate as little as 1kW, while bigger plants could generate up to 350kW handling a water flow of up to 10,000 litres/sec.

“Old mills are ideal sites as the civil works are already in place and there is the potential to generate up to 15kW or so, depending on what’s there.”

Planning permission would be required for such an installation, and in the UK they have gone through all the processes to establish it as a fish-friendly design. Being site specific, it could be hard to estimate the price of installing such a facility, but MannPower Consulting has produced a chart in an effort to do just that.


Eco Evolution featured in The Farmers Journal (14 Nov ’09)

Turning the screw on power

Turning age old technology on its head has started to allow one Irish company to produce electricity from flowing water.

Ferns based company Eco Evolution ( has become the first in the country to commercialise the Rehart range of Archimedean screw hydro turbines.

Frank Gethings, managing director of Eco Evolution, said “Archimedean screws were traditionally used as water pumps to lift water from one level to another. Archimedean screw hydro turbines work in reverse. Water from a river or stream flows down the screw causing it to rotate. The screw is coupled to a generator via a gearbox and hence power is generated.”

Like many green energy companies they supply wind turbines and solar panels but are finding huge interest in hydropower.

The system can range from 1kW up to 130kW on a single screw system. The first large system of 120kW is to be installed in Omagh, Co. Tyrone, to provide electricity for a leisure centre.

The Archimedean screw is suited to low head sites and can cater for heads of between one and 10 metres height and can take flow rates ranging from 100 to 10,000 litres per second.

For larger flows, two or more screws can be used.

Frank said there is scope for installing it on farms but having an existing mill or works will greatly reduce the cost. It costs €20,000 for the equipment for the 1kW system, but additional site works have to be carried out. Cost efficiency is an issue of scale. A 300kW system might cost €1,000 per kWh to install but a 1kW system might be €20,000.

The system allows debris to flow through and has also been proven to be fish friendly.

Farmers Journal - 14 November 2009

Eco Evolution featured in ‘In Business Magazine’

“… It is a point echoed across the industry. ”The general trend for energy costs will be an upward one and there is also the advent of carbon taxes to consider,” says Frank Gethings, Managing Director of Eco Evolution in Ferns, Co. Wexford. His company offers a wide range of renewable solutions, with wind electricity generating equipment to the fore and a new line in hydro electricity products just becoming available. Gone are the days when these technologies were the preserve of immense ESB projects: They can now be incorporated seamlessly into many business premises.

“Water has been used for energy generation for centuries, but Archimedean screw hydro turbines are relatively new to the market – they’re a 21st century application of an ancient technology,” says Gethings. “They are suitable for small domestic applications from 1kW up to larger applications of 350kW.” Both wind and hydro power work on simple principles: the rotor is turned by wind or water; a generator attached to the rotor then generates power that can be fed into the building’s power supply. Another renewable energy solution is solar power; a technology that has been around for years yet is only coming into affordable, mainstream usage now – particularly helping to reduce heating costs…”

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