Installer Directory


Janet Richardson


Updated on

Aug 06, 2023

Read Time : 4 Minutes

Hydroelectricity, Hydro Electric Systems Information

Hydroelectric and micro-hydro systems harness energy in flowing water in order to generate electricity. The United Kingdom is particularly well suited to generating electricity using hydro technology as it has a relatively wet climate that means there is a plentiful supply of fast running water. Whether installed by a river-based water source or in tidal areas, hydro technology is a great way for homes, businesses and communities to exploit a clean, free and inexhaustible energy source.

What’s more, as well as generating energy in an environmentally friendly way, hydro systems can also present an excellent commercial opportunity with a significant return on investment. Despite their ability to produce electricity 24 hours a day, hydropower currently only accounts for 1.3% of the UK’s total electricity consumption, with most of the systems located in Scotland and Wales. This figure is set to rise, however, as hydro technology becomes increasingly accessible for local communities and as the price of non-renewable energy skyrockets.

The History of Hydroelectricity

Since man first became civilised he has been trying to harness the running power of water to help operate things like grain mills and irrigation systems. Our ancient ancestors were often at the forefront of innovation when it came to renewables such as hydropower. It was simply a matter of waiting until the discovery of electricity came along when the two technologies could be combined to create power plants.

Then, throughout the 20th Century, we began to construct huge dams that could be used to generate electricity for millions of homes. In more recent times, hydroelectricity has begun to downscale, with smaller projects being developed on a community scale. Discover the rich history of hydroelectricity.


Compare prices from local companies fast & free

Enter your postcode to compare quotes from leading professionals. We promise to keep your information Safe & Secure. Privacy Policy

How Hydroelectricity is Generated

The generation of electricity through hydropower is a relatively simple process. At its core, fast moving water drives a turbine which in turn feeds that mechanical energy into a generator that produces alternating current. The amount of energy which is produced is dependent on a number of factors such as the speed and force of the water and the type of generator being used.

Large scale constructions like the Hoover Dam in America use vast reservoirs to supply a continuous flow of water that can be used to create electricity for hundreds of thousands of homes.
Find out more about how hydroelectricity is generated.

Types of hydroelectricity systems

There are two main types of turbine that make up a hydroelectric system. Impulse turbines are partly above water and reaction turbines are, in contrast, fully submerged but they both do the same job in turning a shaft that feeds into an electrical generator.

There are different scales when it comes to hydroelectricity from large industrial installations to smaller, micro hydro plants that produces less than 100 kW. We are also now beginning to explore the prospect of finding ways to harness the power of the sea through tidal hydroelectricity.
Explore the different types of hydroelectricity systems.

Types of Micro-Hydro Turbine

Micro hydro turbines are those systems that generally deliver under 100 kW and are often installed to feed one property. They are easier to install and can be of a variety of types, often depending on the style of turbine that is being used.

Like other forms of renewable energy, a micro hydro system can benefit from the Smart Export Guarantee (SEG) which means you can earn money by selling your energy production to the National Grid.
Find out more about micro hydro turbines.

Community Hydroelectricity

One of the areas that hydroelectricity is beginning to show great benefits is the development of community projects that not only produce clean energy but also provide a significant income that can be fed back into the local population.

Whilst the initial installation cost for a hydroelectricity project can often stretch into the millions, the payback time can be as little as 6 years. Communities buy shares in the project and also get the chance to benefit from the profits, something that also reduces the amount that is taken out in loans.
Discover the benefits of setting up a community hydroelectric project.

Commercial Hydroelectricity

It’s not just communities that can benefit from installing hydroelectricity. With the Smart Export Guarantee, it's possible to get a quick turn around on return on investment, many businesses are now beginning to look at the prospect of this form of renewable energy as a realistic proposition.

Organisations such as the National Trust and Welsh Water have already embraced the possibilities, as have a number of farmers in Wales. Is hydroelectricity right for your business?

Large Scale Hydroelectricity

Some of the largest construction jobs undertaken in the last century have been for hydroelectricity production. Most major developing countries have invested heavily in the building of large dams that are used to drive huge turbines and generate electricity for millions of people across the world.

From the Hoover Dam in the US to the Three Gorges Dam on the Yangtze in China, large scale hydro has made a big difference to the world we live in.
Explore the world of large scale hydroelectricity.

Is my site suitable for hydroelectricity generation?

There are a number of issues that you have to consider when you undertake a hydroelectric project and the primary one amongst these is the suitability of the site. Renewables such as solar PV can be installed almost anywhere, but hydroelectricity needs a fast flowing water source, whether that is caused by a dam system or a naturally flowing river.

This is where head and flow rate become important and why location is vital. Find out if your site is suitable for hydroelectricity.

Components and Electrics for Hydroelectric Systems

The parts that make up a hydroelectric system will depend on the complexity of what you want to do and how much power is going to be produced. Essentially, water is used to drive a turbine which is used to turn a shaft that feeds into a generator that produces alternating current.

The electrics will in turn depend on the level of monitoring you want for the system and whether you are feeding into the National Grid or just powering a single, off-grid property. Discover the different components of a hydroelectric system.

Environmental Impact of Hydroelectricity

There are number of issues to take into account when installing a hydroelectric plant, the most important being the environmental impact.

Most installations will need to have a survey done for the Environmental Agency to ensure that there is no adverse impact on things like the local landscape and the wildlife, particularly fish. Take a look at the environmental impact of our hydroelectric project.

Costs Associated with Hydroelectricity

If you are considering installing a hydroelectric plant on your property you need to consider more than just the cost of the equipment. You will also need to be aware of the additional costs that will be incurred through planning and development and the actual installation, especially if the site is in a remote area.
Find out more about the cost of hydroelectricity.

Financial Benefits of Hydroelectricity

Whilst the cost of installation can initially be daunting, many commercial and community projects are beginning to see the benefit of opting for hydroelectricity as a renewable and profitable energy source.

Generally, the larger the size of the hydroelectric installation, the more quickly the initial investment is paid off and a return on investment achieved.
Discover the financial benefits of a hydroelectric project.

Planning permission for Hydroelectricity

Unlike other renewable installations like solar which are permissible under current planning law, most hydroelectric projects will need to go through the council to obtain planning permission. They will also normally need to satisfy Environmental Agency criteria that no harm is being done to the site.
Find out more about planning permission for hydroelectricity.

Is Hydroelectricity Worth It?

There are a number of factors that go into deciding whether installing a hydroelectric plant for your property is going to be worth it, quite apart from the initial cost. There are issues of how suitable your site is and all the work that goes into planning and designing the project.
Find out if installing hydroelectricity is going to be worth it.

Certification bodies for Hydroelectricity

There are a number of certification bodies associated with hydroelectricity and other renewable technologies. You can find out more here.

Manufacturers of Hydro Turbines

There are now a wide range of manufacturers and suppliers for hydroelectric systems and turbines in the UK as the industry begins to expand. Many can take your through the whole planning and design stage to actual construction. Browse our list of manufacturers and suppliers here.

Installers of Hydroelectricity

The installation of micro hydro is a growth industry and you can explore our list of things to look for and also get access to our database for companies in your area here

Find a local installer

Welcome to the biggest directory of UK renewable energy companies


Related Information


A brief history of Hydroelectricity

Before the discovery of hydroelectricity, man was already finding new and ingenious ways to utilise...


How Electricity is produced with a Hydroelectric Turbine.

How Hydroelectricity is Generated Fast moving or falling water is the primary ingredient needed...


What are the Different Types of Hydroelectric Systems?

There are two main varieties of hydro turbine, though the technology used in both is much the same...


Types of Micro Hydroelectricity Systems

What are the different types of Micro-Hydro systems? Micro Hydro systems typically produce under...

Find a local installer

Welcome to the biggest directory of UK renewable energy companies



Compare prices from local companies fast & free

Enter your postcode to compare quotes from leading professionals. We promise to keep your information Safe & Secure.

Privacy Policy

Contact Us

Answer these simple questions and we will find you the BEST prices.

What technology are you looking to install?

What do you require?

What happens now?
  1. We will give you a quick call to discuss your requirements.
  2. With your permission, we'll get three vetted companies to contact you.
  3. Compare quotes and select the best fit.
The Renewable Energy Hub provides expert advice for those looking to invest in renewables.

We've been doing so for over a decade. Fill in the form on the right and one of our experienced operators will give you a call to discuss your requirements and answer any questions you have.

We're ethically run and will only share your details with 1-3 of our REH approved installation companies with your express permission. Privacy Policy

Please enter your contact details


Before you go...

Can we help you with anything?

Leave your details and we'll give you a quick call to discuss your requirements