The “GloBug” prepay power system is used in conjunction with a smart meter. In NZ, it is currently being marketed to low-income families with large billboards at a number of Auckland locations.
There were reports a few years ago that one of the companies using the GloBug had tried to bully customers into accepting this system.
You can read about the issues with GloBug at this link: http://www.stopsmartmeters.org.nz/government-and-electricity-industry-positions/do-you-have-a-globug-prepay-power-system/
Below is a photo of a meter and an aerial that was installed inside a family home to facilitate the use of the GloBug system.