What is a hierarchy? Broadly it's a ranking based on some criterion. As such hierarchies follow from a society's wants and needs (you could say it follows from the needs hierarchy of society itself) and shift all the time. As an example consider the rise of software developers which was based on the increasing need of society for software.

A hierarchy is necessary to allows society to adjust rewards to its needs. It isn't necessarily some oppressive force keeping people caged in their circumstances (though a dysfunctional one quickly becomes that, see the CCP aristocracy in China).

If we want more renewable energy installed, we necessarily have to adjust the hierarchy by increasing the rewards (status, money ...) for the entities and people installing it.

I don't quite get how you can reduce it to "someone is above someone". While that is obviously an aspect, you cannot have a society that does anything without having a hierarchy. If you can show me a society with no hierarchies I'm all ears.