Power consumption of Vodafone Gigabox SHG3000

It would use about 20 watts max and mostly a lot less. That’s 0.02 kWh at about 18 cents per kWh that will cost you €31.50 per year, running it 24/7

Also the 20 watt consumption is probably a major over estimate as the router will use much less when nothing is happening and the maximum wattage on the adapter is not what it consumes, but rather the absolute limit or what it can supply. So it would include the router powering external devices by USB etc, which most are not.

It’s likely costing you less than €20 a year to power.

If you want to cut energy costs, the big consumers are things that run for long periods at high loads - heaters, old style non heat pump dryers, older dishwashers, poorly insulated traditional immersion heaters, old ovens with bad insulation, poorly insulated fridges (old ones usually) and also non LED incandescent lights / halogen lights, because they are so numerous.

Small electronics like routers, mobile phone chargers, even computers and TVs with LED screens have negligible impact on your bill.

Other than electric heating costs, and using LED lighting, updating to A+++ rated major appliances can have a big impact - especially traditionally high consumption dryers, dishwashers, ovens etc.

Things like long simmering cooking etc and very long showers (if electrically heated) add up fast.

Also use a site like Bonkers.ie to do a price comparison for your energy and shop around. Even if you’re in minimum period contracts, it’s often only a small penalty fee to change anyway. Doing a swap of power provider once a year is probably the biggest saving you’ll make.

Have your energy consumption stats ready when you’re doing it though. There’s no point in using vague ones / national averages.