How to Reduce Your Electricity Bill in Ireland: A Prioritised Plan With the Maths (2026)

There are two ways to lower an electricity bill: pay less per unit, or use fewer units — ideally in the cheapest hours. The first is a phone call or a few clicks; the second needs you to know where your electricity actually goes. This plan works in that order, with a formula you can use on any appliance.

Step 1: pay less per unit

• Find your current unit rate and standing charge on your bill. If a discount period has ended, you may be on a more expensive standard rate.
• Compare offers on a CRU-accredited comparison site using your actual annual kWh, ranking by estimated annual cost — see how to switch supplier.
• Check your tariff type: flat, day/night or smart. A cheap night rate only helps if you use enough electricity at night — see is night-rate worth it?
• Understand the fixed part: the standing charge is paid regardless of use — see standing charges explained.

Step 2: find where your units go

The formula for any appliance:

kWh = watts × hours ÷ 1,000 · cost = kWh × your unit rate

The power in watts is on the appliance’s label or manual. Using a hypothetical 30c per kWh:

Real appliances cycle on and off, so these are upper estimates. For a measured picture, a plug-in monitor or your smart meter data is better — our seven-day appliance audit gives you a worksheet.

Step 3: shift what can move

If your tariff has a cheaper window, flexible loads are where the savings are. Using the immersion example and hypothetical rates of 35c (day) and 18c (night):

• 1,095 kWh at the day rate: €383
• The same heat at the night rate: €197
• Difference: €186 a year — from a timer, not from using less

Good candidates to shift: immersion or hot water cylinder, dishwasher, washing machine, EV charging and, with care, a heat pump. Check the actual hours of your tariff’s cheap window before setting timers.

Step 4: trim the waste

• Hot water: heat it only when needed, check the cylinder is insulated, and avoid leaving an immersion on all day.
• Laundry: full loads at lower temperatures; air-dry when possible.
• Cooking: lids on pots, kettle filled only as needed, microwave or air fryer for small portions.
• Standby: switch off always-on devices you don’t need, such as old set-top boxes and chargers.
• Lighting: replace any remaining halogen or incandescent bulbs with LEDs.
• Heating controls: if you heat with electricity, use thermostats and timers so rooms are heated only when used.

Step 5: upgrade when you’re ready

The larger, longer-term savings come from changing the home itself, most of which is part-funded by SEAI grants:

• Attic and wall insulation — less heat needed
• Solar panels — generate some of your daytime electricity
• A heat pump — efficient heating once the home is insulated

A one-page action list