Humans have always harnessed the power of the sun, using it to tell time and start fires. And we’ve only gotten better at it. These days, we use photovoltaic (PV) panels to generate renewable solar energy, but the idea is basically the same. We’re using one of the most abundant energy sources to create a more comfortable and environmentally friendly way of life.
Solar power is a growing trend – globally, including in the United Kingdom. There are now over 1,333,000 registered solar power installations in the UK, with approximately 1.1 million of them on homes. According to Solar Energy UK, the UK now has at least 15GW of solar power capacity, with two-thirds on the ground and the remainder on residential and commercial roofs.
Solar supplies a relatively small 4.9% of UK electricity, but is the third most generated renewable energy in the country.
Enough energy to power the world
In just one hour, more energy from the sun falls on the earth than is used by everyone in the world in an entire year. The challenge is how to efficiently collect, convert and store all that energy.
Give it back to the grid
Did you know that unused energy from a solar PV system gets sent back to the grid? Thanks to the Smart Export Guarantee (SEG) scheme, launched in January 2020, you can get paid for the solar energy you ‘export’. This means you can sell any excess power you generate and do not use back to the national energy grid. Alternatively, batteries can be installed to store solar energy for later use.
Renewable rooftops
Taking up valuable land for solar farms is not always necessary. The cost of solar systems on residential rooftops has dropped by 82% since 2010. A 5kW system, which is best for a 3-bedroom house, would total around £6,000 – £8,000.
Global gigawatts
The title of the biggest solar farm in the UK belongs to Shotwick Solar Park in Wales – which supplies most of the energy for the UK’s largest paper mill. Meanwhile, unsurprisingly, Cornwall is the best-performing region for solar, housing 15% of the total sites in the south-west.
Globally, the leading solar countries are China with the US, Japan, and Germany right behind. However, the highest penetration, around 10%, is in smaller countries such as Greece and Honduras.
Sources: Raymond James research; scientificamerican.com; energy.gov; thoughtco.com; census.gov; uwsp.edu; news.energysage.com; https://www.theecoexperts.co.uk/solar-panels; https://www.greenmatch.co.uk/blog/2014/08/what-is-the-installation-cost-for-solar-panels https://solarenergyuk.org/news/rooftop-solar-power-installations-double-in-a-year/