Azuri technologies, the UK-based company has created a pay-as-you-go interface which allows households to pay for solar power as they use it with scratchcards, making them affordable to those who need them. The Indigo pay-as-you-go controller allows power to the sockets only when the system has been unlocked by entering a valid code on the keypad. The code is obtained by sending a scratchcard number along with the serial number of the Indigo unit by SMS to an Azuri in-country gateway that relays the information to the Azuri central server. This solution is now deployed in 9 African countries.