Shoppers have been reported getting stuck in the car park at Newgate Lane for lengthy periods.
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Writing on social media, one shopper said: “Gridlock in Fareham Asda stuck in car park no one is going anywhere. Electric is down everywhere.”
Another said: “Yes chaotic. We just managed to get out before it got any worse. Potentially down until 8pm this evening.”
A third said it was “totally rammed”, while a fourth person had some good news, saying: “Quite surprised companies as large as Asda and B&M don't have a backup generator. Fareham town centre is fine.”
A fifth person added: “The car park in Asda is gridlocked, we have been 45 minutes trying to leave, you would think that the police would organise something to get the traffic moving.”