Tens of thousands of people in Northern Ireland rushed to purchase energy top-ups before big prices rises kicked in.
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Substantial increases in the cost of electricity and gas from some suppliers came into effect on Saturday.
SSE Airtricity, Electric Ireland and Click Ireland all put their electricity price up by about a third, while gas from SSE Airtricity went up by 28%.
PayPoint, which operates the top-up card system, described the rush for top-ups on Friday as "unprecedented".
It said one retailer in Northern Ireland processed 45,000 energy top-ups on Friday - it usually does about 5,000.
Some retailers struggled as they hit their daily quota of energy sales - that was despite sales limits being quadrupled in recent weeks.
PayPoint said the fact that some shops could not sell top-ups was not due to a technical issue.
