Why choose C21e solar tiles and slates?

C21e Slate in Languedoc, France

Subtle, elegant and brilliantly effective, our C21e solar tiles and slates have taken the world by storm. They’ve won dozens of awards and have become an industry standard, powering thousands of homes for free.

  • Great-looking solar – integrating seamlessly with new and existing roofs.
  • Highly compatible – fitting a huge range of roof tiles and slates.
  • Economical – the design gives you more solar on your roof, for maximum output.
  • Durable – with full wind, fire and weather testing, 25-year power warranty and 10-year performance guarantee.
  • Respected – winner of the Queen’s Award for Enterprise for Excellence in Innovation, the Ecobuild Best Building Product, the Sunday Times R&D Award and many more.
  • Quick and easy – installs ‘straight from the box’ using traditional roofing methods.

Ideal for new builds and re-roofing projects, you can be assured we’ll support you at every step, with expert advice and experienced installers.

The C21e family

There are three variations in the C21e product family. Your installer can recommend the right one for your roof. Find a recommended installer below.
For datasheets, installation details, compatibility and other technical specifications click on the image of your preferred product:

C21e solar electric slate

C21e solar slate

Compatible with natural and artificial roof slates, this product is particularly popular on listed buildings and in areas of aesthetic sensitivity.
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C21e solar electric plain tile

C21e solar plain tile

Compatible with traditional small-format plain tiles, single and double camber, from a wide variety of manufacturers.
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C21e solar electric interlocking tile

C21e solar roof tile

Compatible with interlocking roof tiles, this product complements a traditional pitched roof perfectly.
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Innovative design

Innovative design

"Revolutionary" and "unique" are often over-used words – but C21e is both. It has been designed in response to the needs of the roofing and solar market.

Its success in the solar industry and with roofers is down to the dedication and expertise of Solarcentury's innovation team. They have worked closely with installers to design a product that looks great, fits with existing roofs, maximises energy - and is simple to install.

C21e has been fire, wind and rain tested, and is warrantied as a solar AND a roofing product. It is one of the only products to have received MCS 012 certification; from the end of March 2014, the Feed-in-Tariff will only be available for solar systems that meet the demands of MCS 012. Read the full press release here...

Featured project


A 21st century solar roof for Decimal Place, Amersham

C21e fits in seamlessly with the slate roof at Decimal Place, a new 955m² office building at Amersham. The building is powered by 18 kWp of C21e Slate, the largest single roof installed to date in the UK.

Read more...View more C21e case studies

How to buy

Find an approved installer

Enter your postcode to find some local installers – all MCS-accredited and recommended by us, so you know you’re in good hands.


Trade with us.

If you're MCS accredited and want to start installing C21e products, call us on 0207 549 1000, or fill in this form


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In 2006 we established the international development charity SolarAid whose goal is to eradicate kerosene lamps from Africa.


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