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Frequency distributions of power generation at the 1 km × 1 km scale are counted to characterize the resource potential level of Hunan Province, which is shown in Fig. 9. Solar power generation capacity is concentrated within 14.97–69.81 GWh, with a mean value of 23.97 GWh.
Fortunately, Hunan remains considerable area available for PV and wind power planning, accounting for 27698.73 km 2 and 35013.38 km 2 respectively, which mainly concentrates in the south, north and central of the province.
The main conclusions are as followed: Geographic suitability assessment considers the various constraints during solar and wind energy development, the unique hilly and mountainous terrain are the main factor restricting the solar and wind resource development in Hunan Province.
Although solar and wind resource endowment of Hunan Province is not prominent in China, multi-temporal and spatial scales assessment illustrates that Hunan Province can achieve energy self-sufficiency through solar and wind energy utilization, and make a considerable contribution to the reduction of carbon emission.