Wind farms: What are the pros and cons of wind energy?

How do wind farms work?

Wind turbines are a relatively simple system of generating electricity, and haven’t changed much over the centuries.

As the wind rotates the blades – which face into the wind and are tilted to generate the greatest rotation – the blades rotate a shaft and a generator, which turn the energy into electricity.

Modern wind turbines will also have sensors which detect the direction and power of the wind, so they can be rotated toward the wind or shut down if the wind is too low, or too powerful.

Crucially, electrical energy is lost if it is transported great distances, so the closer the wind farms are to the grid, the more efficient they become.

Why are wind farms popular?

The UK is a very windy country, with an estimated 40% of the wind that hits Europe passing over us first.

More importantly, wind is a renewable resource with wind farms having a virtually non-existent carbon footprint (once constructed).

Meanwhile, in 2016, the Government announced ambitious new carbon targets: to reduce carbon emissions by 57% of 1990 levels by 2030. This makes wind farms and wind energy an increasing popular renewable energy resource for the UK and Britain.

Wind power contributed 18% of the UK's electricity generation in 2018, compared to just 1.5% ten years earlier.

In fact, as of 2019, the UK is the world leader of offshore wind power, providing more than a third of Europe's offshore wind resource. By the end of December 2019, the UK was the sixth largest producer of onshore wind power in the world, with more than 10,000 turbines.

In January 2023, a new UK record for energy generated by wind was set, with 21.6 GW recorded.

What are the pros and cons of onshore wind?

Pros of onshore wind farms

• Onshore wind costs half as much as offshore wind, a quarter as much as solar power, and even slightly less than nuclear power

• It's environmentally friendly - while building wind turbines involves some emissions, once running they have a very low carbon footprint

• Onshore wind has a limited physical impact on the environment - it doesn’t poison the land, or release toxins, can be farmed around, and once removed leaves almost no impact.

Cons of onshore wind farms

• When they are not running, wind turbines will need fossil fuel backup, particularly as they take up a greater proportion of our overall energy generation

• The turbines have a huge visual impact, particularly as wind farms are built on top of hills to capture the most wind

• Additional concerns are that they can impact birds and bats, and they can also produce some noise, disturbing local residents.

What are the pros and cons of offshore wind?

Pros of offshore wind

• Offshore wind farms are bigger than their onshore rivals, and with far more wind out at sea compared to onshore, they can produce far more energy and more reliably

• There is lower visual impact with offshore wind

• There is very little impact to wildlife, with the farms even providing offshore reefs for fish, making them one of the greenest forms of energy generation available.

Cons of offshore wind

• Constructing huge wind farms out at sea is understandably expensive, and when they break down they are also expensive to fix and maintain.