Funding for this research was provided by:
Federal Ministry for Economic Affairs and Energy, Germany (0324065)
Received: 24 November 2018
Accepted: 18 May 2019
First Online: 25 May 2019
Change Date: 3 August 2019
Change Type: Correction
Change Details: An error occurred during the publication of a number of articles in <i>Geothermal Energy</i>. Several articles were published in volume 7 with a duplicate citation number.
: The authors declare that they have no competing interests.