137
Heat from extinct volcano could be piped into Dutch homes
(www.theguardian.com)
This is a most excellent place for technology news and articles.
For those interested: since there's been a huge gas exctraction scandal in Groningen, (gas) mining has become a sensitive political subject in the Netherlands.
Also the Zuidwal volcano they are talking about is 2 km deep.
Geothermal energy is an interesting additional "green" option, if the mining risk can be minimised.