Renewable Energy Party joins the ranks of single issue parties with a focus on the rapid transition to renewable energy. They propose a target of 100% renewable energy by 2030. This is pretty ambitious. I think the larger hurdle to achieving this will be the political rather than the technological aspects (it just requires a large enough chunk of cash.)
They also have considered what they'll do on policy matters outside there focus area. They'll support the government of the day. This is a non-confrontational approach but it seems like it removes some of the opportunity for negotiating to achieve their ambitions. It also reduces the chance that supply would be blocked, which would be a good thing overall.
Finally, they have one of the cuter party logos.