As a leader in the European data centre industry, we strive to set an example of environmental responsibility. In addition to innovations in engineering and diligent operations for maximising energy efficiency, Interxion supports and consumes energy from sustainable and low carbon sources to the greatest practical extent in our markets of operation. A large proportion of our power comes from sustainable sources, including water, solar and wind.
A large proportion is a bit vague, and not the same as 100%.
If they're part of the same group, as Digital Realty, they should have these numbers as DR's report includes total powered used, vs total power from renewable sources, and there are clear ways to confirm this if true.