In their testing, the researchers found that fast-switching devices distort the normally smooth 50 Hertz sine wave of the power supply. Instead, the wave takes an erratic shape and that's something electronic meter designers have not made allowances for. Meters using current transformer or shunt resistor sensors provide fairly accurate readings even with energy-saving devices. However, smart and electronic meters using Rogowski Coil sensors provided very high and inaccurate readings. Genesis responded by saying the research was conducted in the Netherlands "which would have different regulations regarding their electricity supply and certification of electricity meters."

Source: New Zealand Herald March 12, 2017 00:30 UTC