Do you want to change to an electricity product with a lower environmental value? For example, from ewz.pronatur to ewz.natur? Then please let us know no later than 20 days after you’ve received your yearly bill. The change will apply as soon as the new billing period begins. Do you get a bill every month? Then the change will apply from the next quarter, but only if you’ve told us that you want to change 30 days in advance.