In some cases, you are not allowed to install regular solar panel in my country. If you live near an historical monument, it can be impossible because it would clash with it. These solutions could be an alternative.

France still has one. It’s called CB (Carte Bleue) and is working alongside Visa and Mastercard. Notoriously, some years ago Visa was down for a day and it impacted lots of countries except France because everyone fell back to the CB Network.