Under the day-ahead electricity market, it is an important strategy to improve the profit of an electricity producer by reasonably bidding the block electric quantity and price. In order to present the strategy that satisfy risk requirement, this paper presents a new method to bid block electric quantity and price. The method analyses MCP forecasted error at first, and then calculate its probability distribution. At last, the VaRs of error under different confidence are obtained, which could guide IPP to submit block electric quantity and price. The results declare that the method is not only satisfies the request of simple and practicality, but it also meets all the conditions of day-ahead power market.
