Big six energy companies routinely overcharging customers – exclusive

Analysis for the Guardian shows most companies charging customers the same after switching them to 'cheaper' tariffs

The UK's big six energy companies have been accused of dirty tricks after analysis for the Guardian revealed that they are routinely charging customers almost exactly the same amount after switching them off controversial default tariffs.

In the face of Theresa May's plans to impose a price cap on standard variable tariffs (SVTs), which more than half of energy customers are on despite their steep prices, companies such as British Gas, E.ON and SSE have pledged to phase out such tariffs and shift billpayers onto better value fixed deals.