A New Class of Hybrids
The word “hybrid” in the power generation universe has generally been understood to mean a fossil-fuel engine supplemented by another power source, usually a renewable.

Then, the word grew to include vehicles and equipment that ran primarily on battery power but could be switched to a smaller engine that would recharge the battery while it ran.
Now, we are entering a time when “hybrid” includes drive systems that are primarily renewable-based and supplemented by an additional renewable system.
In this sphere, alternative power has primarily meant batteries and hydrogen fuel cells; one of the major impediments to wide adoption has always been range.