Well to be truthful there should not be a lot of changes necessary to a base data model for Electric Distribution and or Transmission (I work in both). However, I have personally found nearly every distribution data model to be overloaded with a lot of extra unnecessary items. Granted there are those who may make use of some of those attributes. But when you have a basic data model that contains 75 different attributes for a Service Point you end up with a lot of clutter. Most of my clients eventually want Windmil analysis so I have been using the NISC dm for them. I also like their data model better than most others. However, they have not updated their DM since 9.3. But there has not been a lot of change.
If I ever get back to the EGUG conference I wanted to organized a data model session for the Electric Community. Get a group of 10 people who have 15 plus years in Electric Distribution and hammer out a good solid all the junk removed data model.