You can't ask anyone to change society's rules by themselves. That being said, you are part of society. If you live differently than your neighbors, you might actually be the model that people will emulate, and not the gaz guzzler.
Sadly, that's pretty much the extent of your control, unfortunately (that, and maybe voting for people to change the laws, which would indirectly change the rules of society - although, usually, the relation goes the other way.)
In this case, if it's even in people best interest to change the "timing of dishwashing" to align on cheap hours - I trust people will do.
The trick is to not overpolitize it - my mum has always launched her dishwasher during "heures creuses", not caring a damn about why the electricity is cheaper at this time. If the cheapest hours end up being earlier, lots of people will just adapt to save a few bucks - it may be smarter to NOT mention solar power, or environment, or whatnot.
Sadly, that's pretty much the extent of your control, unfortunately (that, and maybe voting for people to change the laws, which would indirectly change the rules of society - although, usually, the relation goes the other way.)
In this case, if it's even in people best interest to change the "timing of dishwashing" to align on cheap hours - I trust people will do.
The trick is to not overpolitize it - my mum has always launched her dishwasher during "heures creuses", not caring a damn about why the electricity is cheaper at this time. If the cheapest hours end up being earlier, lots of people will just adapt to save a few bucks - it may be smarter to NOT mention solar power, or environment, or whatnot.