With the new round of power market reform and the development of the ubiquitous power internet of things, power sales companies have gradually developed into integrated energy service providers based on the different resources they have. Aiming at the problem of power capacity allocation on the power generation side under the background of new electricity reform, the paper establishes a twolayer model of power capacity allocation considering the operating status of electricity sales companies. The lower optimization object is an integrated energy service provider including wind turbines, photovoltaic cells, microturbines and controllable loads. The upper layer takes the lowest power investment cost of the power generator as the optimization goal. The bilevel programming model is solved by using the nonlinear programming tool. The results of numerical examples verify the effectiveness of the method. In the example, the electricity sales company impact the power supply capacity planning of the power generator from the two aspects of new energy consumption growth and demandside response reduction in peak load.