The Dail heard claims retailers had increased prices, ahead of an emergency vote on Wednesday night to cut to excise on petrol and diesel - something they've denied.
Prices are still in the region of 2-euro a litre despite the new tax cuts.
The CCPC says it has written to petrol retailers to remind them of their obligations under consumer protection law.
Michael Grubb is a Professor of Energy and Climate Change at University College London.
He says prices had already been rising globally since Covid-19 lockdowns came to an end
"There was a period, only two years ago, where prices were low, and that basically forced Russia and OPEC, to start learning how to work together. They got the price back up, and as we began and the world began to come out of COVID we got into a bidding war with Asia where demand was rocketing, and that was driving up the price, this is all prior to Ukraine, and as a colleague in the field once said well, those tankers are going to turn left or right depending upon who pays the most"
