Renewable electricity price increase?

I pay to get my electricity from renewable sources, so why is my electricity bill increasing when the price hikes are to do with the cost of fossil fuels increasing?

From today’s blog post: “While we only ever buy 100% renewable electricity and 10% green gas, there is only one price for gas or electricity in the UK. There aren’t separate markets for green and non-green energy sources. The price is determined by what people will pay for energy at a particular time, regardless of the source. So, when the cost of electricity produced by burning gas goes up, so does the cost of electricity from wind, solar and all other green sources.”