His solution was to read data from the utility meter using RTL-SDR to fill in the blanks. The results are good so far, and there’s no reason similar readings for gas and water can’t also be done.

Almost four million smart ... gas and electricity you use. You get one meter for each energy supply. They can record half-hourly price and consumption data, external and automatically send ...

Smart meters measure how much gas and electricity a household uses and show how much it costs in near real time. They can send readings via a remote connection to energy suppliers (smart mode).