Shanghai is considering implementing a power pricing scheme that would charge more for power consumed during peak hours during the summer with the goal of avoiding the power shortages experienced during the summer of 2003, according to Shanghai media reports citing local officials. Shanghai's government anticipates power deficits of as much as 2,000 MW during peak hours this summer, which it said it will try to make up via power from other sources. Under a preliminary plan released by the government, Shanghai will have three designated peak periods: 9am to 11am, 1pm to 3pm and 6pm to 8pm. City officials said that the proposed pricing scheme would only affect corporate users and that the city would attempt to guarantee power to all residential users.