A method for planning repowering of a wind energy plant (4) is disclosed. The wind energy plant (4) is positioned at a site and comprises a plurality of original wind turbines (5) arranged at distributed positions within the site. Historical data related to the original wind turbines (5) is retrieved. The historical data is collected over a previous time period and during operation of the original wind turbines (5). Meteorological conditions (2) at the site of the wind energy plant (4) are estimated based on the retrieved historical data. The repowering of the wind energy plant (4) is planned based on the estimated meteorological data (2), including planning replacement of the original wind turbines (5) by replacement wind turbines to be positioned at the positions of the original wind turbines (5).
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