> I am on a tarrif that pays a penny more per kWh to use 100% renewable energy so my price should not be impacted by gas prices". How naive was I - prices obviously shot up.

> or if there is some more general economic-theory behind it.

It’s economy 101: supply and demand. If electricity from renewable sources wouldn’t get more expensive, demand for it would soar. Since supply can only follow slowly (it takes time to build wind farms/install solar panels), demand would outstrip supply, so prices go up.