Funding for this research was provided by:
editorial board members of Journal-Energy Informatics (I am a member of the editorial board, and the publication fee for the editorial board members of Journal-Energy Informatics is agreed to be waved off)
Text and Data Mining valid from 2019-08-22
Received: 9 May 2019
Accepted: 30 July 2019
First Online: 22 August 2019
: Not applicable
: Not applicable.
: The authors declare that they have no competing interests.