Hydropower, also known as water power, is the use of falling or fast-running water to produce electricity or to power machines. This is achieved by converting the gravitational potential or kinetic energy of a water source to produce power. Hydropower is a method of sustainable energy production. Hydropower is now used principally for hydroelectric power generation, and is also applied as one half of an energy storage system known as pumped-storage hydroelectricity.
Hydroelectricity, or hydroelectric power, is electricity generated from hydropower. Hydropower supplies one sixth of the world's electricity, almost 4500 TWh in 2020, which is more than all other renewable sources combined and also more than nuclear power. Hydropower can provide large amounts of low-carbon electricity on demand, making it a key element for creating secure and clean electricity supply systems. A hydroelectric power station that has a dam and reservoir is a flexible source, since the amount of electricity produced can be increased or decreased in seconds or minutes in response to varying electricity demand. Once a hydroelectric complex is constructed, it produces no direct waste, and almost always emits considerably less greenhouse gas than fossil fuel-powered energy plants. However, when constructed in lowland rainforest areas, where part of the forest is inundated, substantial amounts of greenhouse gases may be emitted.
Bruton is a market town, electoral ward, and civil parish in Somerset, England, on the River Brue and the A359 between Frome and Yeovil. It is 7 miles (11 km) south-east of Shepton Mallet, just south of Snakelake Hill and Coombe Hill, 10 miles (16 km) north-west of Gillingham and 12 miles (19 km) south-west of Frome. The town and ward have a population of 2,907. The parish includes the hamlets of Wyke Champflower and Redlynch. Bruton has a museum of items from the Jurassic era onwards.
Micro hydro is a type of hydroelectric power that typically produces from 5 kW to 100 kW of electricity using the natural flow of water. Installations below 5 kW are called pico hydro. These installations can provide power to an isolated home or small community, or are sometimes connected to electric power networks, particularly where net metering is offered. There are many of these installations around the world, particularly in developing nations as they can provide an economical source of energy without the purchase of fuel. Micro hydro systems complement solar PV power systems because in many areas water flow, and thus available hydro power, is highest in the winter when solar energy is at a minimum. Micro hydro is frequently accomplished with a pelton wheel for high head, low flow water supply. The installation is often just a small dammed pool, at the top of a waterfall, with several hundred feet of pipe leading to a small generator housing. In low head sites, generally water wheels and Archimedes' screws are used.
Mapledurham Watermill is a historic watermill in the civil parish of Mapledurham in the English county of Oxfordshire. It is driven by the head of water created by Mapledurham Lock and Weir, on the River Thames. The mill was built in the 15th century, and further extended in the 17th, 18th and 19th centuries. It is a Grade II* listed building and is preserved in an operational state.
Pico hydro is a term used for hydroelectric power generation of under 5 kW. These generators have proven to be useful in small, remote communities that require only a small amount of electricity – for example, to power one or two fluorescent light bulbs and a TV or radio in 50 or so homes. Even smaller turbines of 200–300 W may power a single home with a drop of only 1 metre (3.3 ft). Pico-hydro setups typically are run-of-stream, meaning that a reservoir of water is not created, only a small weir is common, pipes divert some of the flow, drop this down a gradient, and through the turbine before being exhausted back to the stream.
The South Somerset Hydropower Group (SSHG) is a group of 10 owners of former watermills in the South Somerset area of England who are installing micro-hydro turbines for electricity generation. The Group was founded as a result of an initiative by South Somerset District Council, and was the first of its kind in the United Kingdom. The Group won one of the 2005 Ashden Awards, and the concept has been adopted by a number of other similar groups.
The Mendip Power Group is a group of owners installing micro-hydroelectric turbines in a number of historic former watermills in the Mendip area of Somerset, England. The Group is one of several formed after the concept was developed by the South Somerset Hydropower Group.
Pitcombe is a village and civil parish 1 mile (2 km) south-west of Bruton and 5 miles (8 km) from Wincanton in Somerset, England. It has a population of 532. The parish includes the hamlets of Cole and Godminster.
Low-head hydropower refers to the development of hydroelectric power where the head is typically less than 20 metres, although precise definitions vary. Head is the vertical height measured between the hydro intake water level and the water level at the point of discharge. Using only a low head drop in a river or tidal flows to create electricity may provide a renewable energy source that will have a minimal impact on the environment. Since the generated power is a function of the head these systems are typically classed as small-scale hydropower, which have an installed capacity of less than 5MW.
The energy sector in Switzerland is, by its structure and importance, typical of a developed country. Apart from hydroelectric power and firewood, the country has few indigenous energy resources: oil products, natural gas and nuclear fuel are imported, so that in 2013 only 22.6% of primary energy consumption was supplied by local resources.
Settle Hydro is a micro hydroelectric scheme, owned by the community, in Settle, North Yorkshire, England. It is located on the River Ribble, at Settle Weir near Bridge End Mill. It generates 50 kW of electricity using a screw turbine in part of the former mill race.
Policy makers often debate the constraints and opportunities of renewable energy.
Tellisford Mill is a 55 kilowatts (74 hp) installed capacity micro hydro run-of-the-river power station on the site of a former watermill in the village of Tellisford in the Mendip district of Somerset, England. The mill lies on the River Frome, 5+1⁄2 miles (9 km) north-east of the town of Frome.
The Lanark Hydro Electric Scheme consists of two hydroelectric plants in the Clydesdale area of South Lanarkshire, Scotland. They are run-of-the-river power stations, using water from the River Clyde near to the Falls of Clyde. Bonnington Power Station gets its water supply from just above Corra Linn in New Lanark, while Stonebyres Power Station takes water from above Stonebyres Linn near Kirkfieldbank. Bonnington is the larger of the two stations, which between them can produce 17 MW.
A screw turbine is water turbine that converts the potential energy of water on an upstream level into work. This hydropower converter is driven by the weight of water, similar to water wheels, and can be considered as a quasi-static pressure machine. Archimedes screw generators operate in a wide range of flows and heads, including low heads and moderate flow rates that are not ideal for traditional turbines and not occupied by high performance technologies.
The Town Mill is a Grade II listed 18th-century watermill located in the centre of Guildford on the River Wey.
