No household uses 1400kW, and kW/year doesn't make sense. Do you mean 1400kWh/year? That seems pretty low (NZ is 7000kWh/year), but if so, you're comparing power to energy, which doesn't mean much. 1W 24/7 < 9kWh/year, which is pretty small.
Personal guess from a fellow European citizen: I think they meant to say 1700 kWh/year. According to most German power utilities, the average 2-person household consumes about 2400 kWh/year.
