If you claim all your energy is from renewable sources how can it be subject to increases in world energy prices which are pegged to world oil prices ?
Renewable generators sell their energy on the wholesale energy market, the same as non-renewable generations.
They do this to maximise their own profits as they are keen to make as large a profit as they can if the price of electricity goes up across the board.
World oil prices impact natural gas prices and natural gas also makes up around 50% of the UK’s electricity generation aswell, so there is going to be an impact of rising oil prices. It goes both ways, lower oil prices do lead to lower gas and electricity prices, as they have both been falling together from 2016 to Late 2017