Objective Offshore wind power is one of the important ways to achieve carbon peaking and carbon neutrality in the future, and has a good development prospect. With the rapid development of offshore wind power, the industrial chain is constantly maturing, and the investment level is gradually reducing. Therefore, the subsidy for grid purchase price is gradually decreasing, and the industry has entered the stage of grid parity since 2021. Taking Guangdong Province as an example, the grid purchase price of offshore wind power projects has decreased by 50% compared with the previous, which has brought great pressure to the investment and development of wind power projects, making economic benefit analysis of projects in the parity stage particularly important for developers' decision-making in investment.

Method In order to analyze the economic benefits of offshore wind power projects in the grid parity stage in Guangdong Province, this paper took a 1000 MW offshore wind power project in Guangdong Province as an example. First analyzed the proportions of major costs in the project investment, and then studied the influence of the price of wind turbine equipment, loan interest rate, unit investment and annual equivalent utilization hours, subsidy policies of Guangdong Province on the project rate of return.

Result The results show that: (1) the price of wind turbine equipment accounts for a relatively large proportion in the total project investment, so increasing unit capacity and reducing price can effectively improve the project's economic efficiency; (2) The downward trend of loan interest rate is conducive to an increase in the capital financial internal rate of return (FIRR). (3) The capital FIRR increases with the increase of annual equivalent utilization hours and decreases with the increase of unit investment. When annual equivalent utilization hours are less than 3000 h, the project with a static investment of no more than 14000 yuan/kW has certain economic benefits under the condition of grid parity.

Conclusion The research results can provide reference for the construction of offshore wind power projects in Guangdong Province in the future.