In order to assess other offers, you need to know, in addition to your place of consumption, your annual consumption of electricity (kWh) or natural gas (m3 or kWh) and, for natural gas, your installed capacity (kW). This information should be indicated on your last bill.
In addition, the ILR provides an online price comparison tool www.calculix.lu which allows you to easily compare the different electricity and natural gas offers available on the Luxembourg market.