You have it backwards. Substations must be located to satisfy demand and not the other way around. Moreover, locating chargers next to a substation has nothing to do with demand fees and no relevance beyond transmission losses. Where have you read that transmission losses are a defining issue for fast charging installations?Forget putting charge stations at a McDonalds. These things need to be placed right next to a substation. Put a McDonald's next to the substation. Then there's no demand fees as electric company has control and can anticipate the demand by communicating with the chargers (plus electric companies are starting to shave peak loads with storage capacity). When semis start needing to charge, we're talking mega watts.