Halo was best when it was Halo:CE played 4v4 on two linked systems, with the teams on two screens in an undersized dorm room in 2002. Alternatively, two people playing through the entire game in co-op mode and finishing at 3 in the morning.
Everything since then has been mid at best
Dams have major ecological impacts. Water towers could work but as I understand it storing heat in sand or salt is more energy dense/efficient vs elevated water and gravity. All of what I just said is based solely on things I've read some time ago but cannot cite, and documentaries about dams