The calculator compares the variable ("green") household tariffs of ΔΕΗ (PPC), Heron, Protergia, NRG and Volton, at the prices they announced for November. It shows the monthly and yearly cost and sorts the suppliers from cheapest. For PPC it applies the tiers: the first 200 kWh of the month are charged at a lower price.
You will find your consumption on your bill, in kWh for the billing period. If the bill covers two months, divide by two.
What it measures: only the supplier's energy charge, the part of the bill that differs between suppliers. It excludes the standing charge, the regulated charges (networks, public service obligations, renewables levy), which are the same for everyone, and VAT and municipal fees, so your final bill will be higher. The yearly figure assumes this month's prices stay the same all year; green tariffs change every month and we update the tool with the new prices.
Privacy: the calculation runs only on your device. We store nothing you type, and the tools have no cookies or visitor tracking. The page itself is in Greek.
Open the calculator: https://tools.statistikosatlantas.com/reuma/
Sources: suppliers' announcements for November 2026 (2/11/2026).
