"Never actually used an economy 7 tariff myself so I don't know the details but the point is most houses in the UK aren't equipped to have one." All homes in B

"Never actually used an economy 7 tariff myself so I don't know the details but the point is most houses in the UK aren't equipped to have one." All homes in Britain will have smart meters installed by 2020: https://www.smartenergygb.org/en/smart-future/about-the-rollout https://www.smartenergygb.org/en/smart-future/about-the-roll... These support Economy 7, as well as whatever other variable tariffs that energy companies dream up in the future.