Berliners will soon have to pay fees and other payments to the administration via the payment system Wero. This was decided by the digital committee of the House of Representatives, according to a report by Rundfunk Berlin-Brandenburg (RBB).
Wero – a combination of We and Euro – is a digital payment service that allows money to be transferred by providing a mobile phone number or an email address. It is intended to be positioned against US payment services such as Paypal.
I don’t accept the premise that any crypto always wastes energy. Bitcoin is maybe the most energy hungry one but others use a lot less.
Ethereum energy use dropped by 99.84% when they moved from proof of work to proof of stake.
https://digiconomist.net/ethereum-energy-consumption
A national digital currency might work different again.
If this truely works, you could get rid of cash. All that metal and paper and distribution fades out. You could end up using less energy over all.