CO2Stats

Green hosting guide

Is Fasthosts green?

What we can show about Fasthosts's hosting, each piece with its source and the date we checked it. Fasthosts is part of IONOS.

Evidence checked 16 October 2026. Green Web Foundation directory checked 17 October 2026.

Green Web Foundation

Listed in the Green Web Foundation's directory of verified green providers, checked 17 October 2026.

GWF lists it as “Fasthosts” (provider 1282).

GWF does not publish when a provider was last verified. Providers verified before October 2026 are reassessed under its new criteria, which no longer accept offsets, at their next reverification.

What GWF verification means, and its new criteria

Where its data centres are

Two UK data centres, in Worcester and London.

Each country's average grid carbon intensity, from Ember: the grid where the data centres are, not the provider's own supply.
CountryGrid averageYear
United Kingdom218 gCO2e/kWh2025

we keep it local with data centres in Worcester and London

https://www.fasthosts.co.uk/about/data-centres Undated

Grid figures: Ember, Yearly electricity data (2026), CC BY 4.0.

Fasthosts's own evidence

Data centres

Our data centres use 100% renewable electricity, as well as sustainable HVO biofuel (not diesel) for their generators.

https://www.fasthosts.co.uk/about/data-centres Undated

Covers
Both UK data centres; no year given.
Backed by
not stated
Note
The page does not say whether this rests on a supplier tariff, certificates or a power purchase agreement.

IONOS Group Sustainability Report 2025

IONOS has sourced 100% renewable electricity for our own data centers for many years.

https://www.ionos-group.com/fileadmin/Publications/Berichte/FY_2025/IONOS_Sustainability_Report_2025.pdf Undated

Covers
The IONOS group's own data centres, financial year 2025. Fasthosts is not reported separately.
Backed by
Renewable electricity bought directly from utility suppliers, per the report's footnote.
Note
The same report puts renewable electricity in the group's rented (colocation) data centres at 90.4% for 2025, partly from certificates and grid averages.

Our reading

  • Fasthosts says all its data centres run on renewable electricity. If its London site is rented space, the parent group's own report gives 90.4% for such sites in 2025; no source says which applies.

Compared with

Our checker on its website

When the checker launches, this section will show its measurement of Fasthosts's own website: a fact about that one website, not about how its customers' sites are hosted.

Listing data from the Green Web Foundation's Green Web Dataset, made available under the Open Database License (ODbL).

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