possibilities. Really, I can be dog tired, and then a thought will cross my mind: when I'm in Rome, I wonder if I could manage a daytrip to Pompeii by public transport? Then I suddenly wake right up and I'm totally energised and researching and finding a way to do it. Then when I've figured it out, I'm all hyped up and want to take on other things.
Or like, if I have an idea to do something like, suppose something annoys me like the the billionth time I go to the bathroom and find myself looking at that dripping faucet and thinking "that's it, I've had it, I'm gonna fix that!" and though I've no idea how, I'll be suddenly really energised and I'll look up how to do it, then go out and get all the stuff and set to work and get it done.
So... possibilities and making things happen. If I get a whiff of the possibility that I can make something happen, something cool or useful or whatever, then it'd get me up and running even if my battery was on zero, so to speak.
I would say people also energise me, but it totally depends on the people. Some people have the opposite effect, particularly "good listeners". I don't want someone to just sit and listen, that's BORING and gets me right down. I want someone to talk back to me and fuel the idea machine, to brainstorm and rapid fire with me, to help generate possibilities, and/or join in with me in a spontaneous project/idea/possibility. The person who does that becomes a god in my eyes lol