The supermarket chain claims that the lower cost of electricity also boosted spending power by £7 per week.
In comparison, energy and fuel prices were climbing at a rapid pace a year ago, and inflation was at a 30-year high.
Asda president and chief executive Andy Bond said: "Spending power is set to rise further in the coming months as inflation continues to fall. That's why it's our job as retailers to try and stimulate customer spending by keeping prices low."
According to BERR, domestic electricity prices in Europe rose by an average of 28.3 per cent between the last quarter of 2007 and the last three months of 2008.
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