Hi, The Smartmeter (in Dutch de slimme meter) is an electricitymeter with a serial port.
The energy company installs it in all the Dutch houses (during the coming years).
Many owners of houses with solar cells have already such a meter.
The meter can be connected to the gas meter.
So it's possible to get in one message the gas and electricity usage.
Electronically it's simple. You use a modified USBtoSerial (RS232) cable, connected directly to the RbP.
Every 10 seconds the meter produces some ascii strings with informaiton about the energy usage .
You can look at the dutch article: http://gejanssen.com/howto/Slimme-meter-uitlezen/
Now I hope someone can help me with connecting this meter to PIDome.
I've posted the same question in detail on the PiDome forum under Hardware/Devices.