Peak Electricity Times in Ireland: Avoid Expensive Hours with Solar & Battery

Irish electricity prices hit their highest point between 5pm and 7pm on weekday evenings — when families are cooking, heating water and running appliances just as solar generation is dropping off. This is the peak period most households should try to avoid, and it's where a solar battery delivers its biggest saving.

When is electricity most expensive in Ireland?

On standard smart-meter tariffs, the most expensive time is typically 5pm–7pm Monday to Friday. Some suppliers also charge a higher day rate from 8am to 11pm, with a cheaper night rate from 11pm to 8am. The exact windows vary by supplier — Electric Ireland, Bord Gáis and Energia each publish their time-of-use bands online — but the evening peak is consistently the costliest window.

How much extra do peak hours cost?

• Standard day rate: 35–40c/kWh (including VAT and standing charge spread)
• Peak evening rate (5pm–7pm): 40–50c/kWh on some time-of-use tariffs
• Night rate (11pm–8am): 15–22c/kWh
• Average Irish home uses 30–40% of its daily electricity in the evening peak

How solar panels help

Solar panels generate most of their power between 10am and 4pm. If you're home during the day, you can use that power directly and avoid buying peak-priced electricity later. The problem is that most people use the most electricity after work — right when solar output is falling. That's where a battery bridges the gap.

How battery storage beats peak rates

A 5–10 kWh home battery stores the solar power you don't use during the day and releases it in the evening. Instead of buying electricity at 40–50c/kWh during the peak, you use your own stored solar at an effective cost of zero. For a typical home, this pushes self-consumption from 40% to 75–80% and can cut the annual bill by an extra €400–€700.

Smart tariffs and time-of-use

Some suppliers let you charge the battery from the grid at night rates (15–22c/kWh) and discharge during the peak. This is called arbitrage and works well in winter when solar is low. Pairing a battery with a heat pump or EV charger also helps — both can be programmed to run on cheap night or solar power rather than peak-time electricity.

Bottom line

Peak electricity times in Ireland are 5pm–7pm, and that's exactly when a home battery earns its keep. Solar PV generates cheap daytime power; the battery stores it and releases it during the expensive evening peak. For Irish homes on a smart meter, the combination of solar + battery is the fastest way to cut the most expensive part of the bill.

Peak electricity times by supplier (2026)

• Electric Ireland Smart Drive: peak 5pm–7pm, day 8am–11pm, night 11pm–8am
• Bord Gáis Smart: peak 5pm–7pm weekdays, standard 8am–11pm, night 11pm–8am
• Energia Smart Data: peak 5pm–7pm, day 8am–11pm, night 11pm–8am, plus a free-hours window most Sundays
• SSE Airtricity Smart Saver: peak 5pm–7pm, discounted weekend rate on Saturdays
• Pinergy 4Rate: peak 5pm–7pm, boost rate 7pm–11pm, day and night bands

Peak electricity times FAQ

Are peak electricity times the same at weekends? No. Most Irish smart tariffs only apply the 5pm–7pm peak on weekdays. Saturdays and Sundays are usually charged at the day rate, and several suppliers add a discounted weekend or Sunday free-hour window.

Is it cheaper to run the dishwasher and washing machine at night? Yes — on a smart tariff, running the dishwasher, washing machine or dryer between 11pm and 8am typically costs less than half of what the same cycle costs in the 5pm–7pm peak. Use the delay-start timer on the appliance.

How much can a solar battery actually save at peak times? A 5 kWh battery paired with a 4 kW solar system typically shifts 4–6 kWh a day away from the peak. Over a year that's €400–€700 off the bill for a typical 3-bed Irish home, and more in homes with an EV or heat pump.

Do I need a smart meter to benefit? For time-of-use pricing, yes — but even on a flat rate, avoiding grid consumption at peak times still reduces overall usage. Every ESB Networks smart meter installed since 2019 supports smart tariffs; you just need to opt in with your supplier.