Then we decided to deregulate.
To a large extent, that business model is obsolete in many places. For example Consolidated Edison in NYC used to generate most of its own power. Here is a link to a generating station they used to own but were forced to divest:
https://en.wikipedia.org/wiki/Ravenswood_Generating_Station
Due to deregulation of the energy markets in New York State, Con Edison was required to sell all of its "in-city" generating stations in New York City including Ravenswood. In 1999, Con Edison transferred ownership of Ravenswood to KeySpan Energy (KeySpan) for $597 million.
I think it's stupid, but nobody asked me before they forced this on Con Ed.
They were legally forced to sell as well, not due to a lack of profitability.
They have to lobby to start charging for the services they will do in the future. If they don't do that, they will soon have to lobby to get free money from people, and that last one can only end badly.
I would wager that the vast majority of people are still going to need/want the connection.
Generation is the only part of the business that produces the money to fund the infrastructure and the generation is the cheapest part of the business.