> Is there a reason the current gas stations, that aren't integrated with refineries, aren't making the investment for charging stations?

They are. For example:

- Petro-Canada has a trans-Canada CCS charging network: https://www.petro-canada.ca/en/personal/fuel/canadas-electri...

- BP is investing in CCS charging: https://network.bppulse.co.uk/

- Shell is investing in CCS charging: https://www.autocar.co.uk/car-news/features/how-shell-reinve...

- A an example of a small operator (don't know if he's been successful): https://www.npr.org/2019/10/26/773446805/gas-station-convert...

- Circle K: https://new.abb.com/news/detail/17193/circle-k-strengthens-e...