Increases in the price of home-heating oil in the aftermath of the Iran war were around eight times higher in Ireland than elsewhere in the European Union.
Figures from the European Commission's weekly oil bulletin show between 23 February and 2 March the price of home-heating oil here jumped by 27.3% - rising from €0.96 per litre to €1.23 per litre.
This was the largest weekly increase across all EU countries, and compares with an average increase in price across the EU27 for heating oil of 3.3%.
The EU member with the next highest increase after Ireland for the period was Austria, where home-heating oil price went up by 9.6%.
The figures quoted by the European Commission are retail prices, and therefore include government taxes such as VAT, excise duty, and carbon taxes.
Commenting on the bulletin, Sinn Féin MEP Lynn Boylan said it is "yet more clear evidence that gouging is happening in the home-heating oil market".
"The industry is taking advantage of an awful situation to pocket bumper profits. It's morally bankrupt behaviour," she said.
Ms Boylan has also criticised the Government's response to soaring fuel prices, saying it "needs to tackle the blatant gouging".
Minister for Enterprise Peter Burke has asked the Competition and Consumer Protection Commission it to carry out a review of the retail energy market due to the sustained price rises in recent weeks.
Chief executive of Fuels for Ireland Kevin McPartland has repeatedly denied allegations of price gouging by the industry, saying suppliers here are dependent on wholesale market prices.
In Ireland we use kerosene for home-heating oil, whereas other EU countries use a less-expensive diesel-like product, and according to Mr McPartland the increase in kerosone prices has been "far higher than in petrol and diesel markets" in recent weeks.
He also said taxes on kerosene used for home-heating oil are contributing to the significant difference in prices paid here and elsewhere in the single market.
Mr McPartland said "no one else in the EU pays a tax on home-heating oil".
In addition, the industry spokesperson said that while only a small amount of petrol and diesel that's used in the EU travels through the Strait of Hormuz, around 30% of kerosene used in the EU comes through the shipping lane.
At the start of this week, home-heating oil prices reached €880 for a fill of 500 litres, which represented an increase of nearly €400 when compared to before the latest conflict in the Middle East began last weekend.
Meanwhile, the price of a litre of petrol has reached €1.90 per litre at some service stations, with the cost of diesel going well above €2 per litre at some forecourts.
