Only pay for your energy what it actually costs! This applies to both our natural gas and eco-gas tariffs. Make the switch today and we'll take care of your smooth transition! e.optimum bundles the energy volumes of more than 40,000 members into a total consumption and thus offers commercial gas tariffs at the conditions of large-scale industry. We buy gas directly at the cheapest trading venues and at different times of purchase. You benefit from guaranteed real market prices. We pass on all price components 1:1 to our customers. No risk premiums are taken into account - as is usually the case with fixed-price contracts - and there are also no monthly basic fees. Customers only pay a usage-based service fee.