The direct answer
A high bill usually comes from one or more of four things: more energy used, a longer billing period, an estimated or corrected meter reading, or a tariff and discount change. Compare kilowatt-hours first, not just euro totals. [1]
Read the bill in order
Check the billing dates, actual or estimated meter status, opening and closing readings, kilowatt-hours, unit rates and standing charge. Compare with the same period last year where possible. A catch-up bill can follow earlier underestimates. [1]
Find changes in use
Electric space heating, immersion heaters, tumble dryers, older appliances and EV charging can materially increase use. Seasonal weather and more time at home matter. Use smart-meter interval data or take regular readings to locate when consumption rose. [2]
Challenge an unexplained bill
Check the reading against the meter, then contact the supplier with the bill and evidence. Ask for the calculation and tariff history. If the complaint is unresolved, follow the supplier’s formal process and then the CRU complaint route where eligible. [3]
What to do now
- Compare kilowatt-hours and billing days.
- Check actual versus estimated readings.
- Review tariff and discount changes.
- Use the formal complaint route if figures remain unexplained.
Primary sources
Claims and service details were checked against these official sources on 2026-07-11. Follow the source for the latest operational detail.
- Commission for Regulation of Utilities: Understanding your energy bill Accessed 2026-07-11
- ESB Networks: Read your electricity meter Accessed 2026-07-11
- Sustainable Energy Authority of Ireland: Understand your energy use Accessed 2026-07-11
Keep reading
Editorial note
Publisher: Around.ie Editorial. This page provides general information, not individual professional advice. Material changes trigger an earlier review. Corrections create a new reviewed version.