I'm flummoxed as well. GotG has always been a non-starter--not going to build an E-ticket they can't advertise. (Tho I wonder how far along they got in the process before Legal realized that clause was there.) Tron is woefully outdated, and the sequel/reboot flopped, it always defied credibility. The only other IP remotely related to energy would be Monsters Inc. but that seems a real stretch.
Of course, until an official closing date is announced and comes to pass, I'm not convinced Ellen won't be there for another decade.