Most of today's residential electrical load on the grid occurs in the daytime hours.

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Travelers are being stranded and flights are delayed, sometimes with a full load of passengers sitting on the runway for hours.

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In Texas, where Amarillo saw 19 inches of snow Monday, fierce winds whipped snow into whiteout conditions that left truck driver and CNN iReporter Phillip Prince -- carrying a load of frozen pizzas -- stranded on Interstate 40 near Groom for nine hours.

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Load shifting is a type of arbitrage based on the fact that it takes about 24 hours for changes on spot prices at the NYMEX to feed into gasoline prices at the wholesale level, according to Mossman.

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"With mobile downloads for BBC iPlayer, you can now load up your mobile phone or tablet with hours and hours of BBC television programmes, then watch them on the road, on the Tube, on a plane, without worrying about having an internet connection or running up a mobile data bill, " said Daniel Danker, general manager of programmes and on-demand for the BBC.

BBC: iPlayer launches mobile-download service