Check out the checkouts at Wait-rose. And the fridges, the lights and everything else driven by the electricity in the recently opened store in Rickmansworth, Hertfordshire. It comes, of course, from the National Grid -just like everyone else's power. But unlike others, this customer gains power, in effect, from one of its products. Tomatoes from a handful of growers are nurtured not from clanking diesel-fired boilers but gas-fired turbines, which heat glasshouses with some to spare.
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