The Esri Solutions page was recently updated, which included some updated solutions specific to utilities. The 'Data Management' solutions now include the ability to deploy them for ArcGIS Enterprise. These are the 'light-weight' network models that have a full-schema, symbology, applications, etc.
This blog provides details for Esri's Network Management Release Plan. Basically, these are supported releases for utilities that are deploying ArcGIS Enterprise and want to understand what versions to deploy for longer term production needs.
Brian Baldwin, Esri Inc., Senior Solution Engineer https://www.linkedin.com/in/baldwinbrian