Know your energy

Energy consumption is expressed in kilowatt-hours (kWh). To calculate energy usage, you multiply the appliance’s wattage by the number of hours it’s used and divide by 1,000 to convert watts to kilowatt-hours. For example, if you use a *100-watt bulb for 1 hour, it consumes 0.1 kWh (100 watts x 1 hours ÷ 1,000 = 0.1 kWh).

To calculate a product's running cost per hour, you can multiply the given kWh by the cost of your electricity unit rate. (0.1 kwh x unit rate €0.3804 = 4 cent) 100-watt bulb for 1 hour using a unit rate of €0.3804 will cost you 4 cent

The costs shown are based on Electric Ireland's standard 24-hour rate. Final electricity bills include an annual standing charge and PSO payment. Appliance costs are estimated based on hourly continuous use. Actual costs may vary with usage patterns.

Examples of energy consumption is intended as a general guide to help you understand potential energy costs and identify which appliances may have the greatest impact on your bill. The wattage listed is an average across various brands and models.

Lowering your room temperature by just 1°C can reduce heating costs by up to 10%. It is recommended to set living areas to around 20°C, with cooler temperatures in bedrooms and hallways, and turning down radiators in rooms that are rarely used.

It is recommended to set your hot water thermostat or immersion heater to between 60°C and 65°C. This temperature prevents unnecessary energy waste while ensuring safe and sufficient hot water. 

For best efficiency and food safety, your fridge should be set between 2–3°C, and your freezer to around –15°C. This avoids overworking the appliance while keeping food fresh.