It's kind of unclear what "rights" you retain after a 2003 donation. Without certain specified committments or benefits, it would be difficult to enforce a demand for continued charging rights. However, I do see an interesting alternative.
I would prepare a news article describing your efforts for years in promotiing EV use, and describing your generosity in helping to estalish a viable EV charging station ten or more years ahead of your time. I would do my best to populate the article with facts, including costs of the station, cost of EV charging (including changes in rate structures over time) and some current projections. I would approach my LOCAL newspaper, and offer to work with their writer to develop a story about how an early EVangelist and user helped create a charging subculture, and what the current (pardon the pun) situation is. Failing to enthuse a local paper and their staff to coauthor such a piece, I would approach one or two local high schools, and offer the info and help to some student looking to write a piece that would be well read outside the school. Don't threaten the school with 'leaking' such information as a means of getting to your goal, but it would be reasonable if they knew you were assembling FACTS for a reporter to use in a local interest story. I would not tell them formally, but informally. Once the school knows the FACTS have been assem bled, they have two options.
- Change their tune to create a happier outcome
- Figure out which facts you used and find ways to refute them, and figure out how to reach whatever author(s) you engaged.
Play your cards close to your chest, don't let them see your hand. Use difficult to argue facts and offer impeccable sources for your facts.
Good luck