I think Solar Energy is large contender although,I believe that it might be best for our nation if we become advocates of Fusion too.
It is a technology coming closer to fruition, and it seems wise,from an economic perspective, that we take advantage of this new market. If we were to be advocates of this new power, and be leaders of its construction be both guarantee an income for our nation and jobs for our people. If we are to influence the Earths nations, we must be respected and what better way than to be the largest contributor power of its power? Using it ourselves will obviously make it an easier sell. Imagine of all fusion reactors had "Made in Asgardia" on it.
Also, solar energy cannot compete with the potential power of a fusion reactor.