[Sephiroth]

Look at what an official web site is saying (and this is also being said in those stupide Einstein ads):

https://www.smartenergygb.org/smart-meter-benefits

What's the link between smart meters and clean air?

From the moment your smart meter is installed, you are helping to reduce our carbon emissions as a nation. Smart meters help to create a smart energy system. With a truly smart energy system we can better match supply with demand, and integrate more renewable energy sources such as wind and solar into the system. These forms of generating energy create less air pollution and emit significantly less CO2 into the atmosphere.

The above is weasel wording for saying they can bring energy sources on stream as demand rises. Like when there's no wind and the sun ain't shining.