Cleve Hill Solar Park (formerly Project Fortress) is a photovoltaic power station on the Graveney marshes between Faversham and Whitstable, Kent in the UK. It started operations in July 2025.

It is the largest solar farm in the UK, generating 373 MW of electricity from 900 acres (360 ha) of solar panels, and will also include 150 MW (possibly with 700 MWh energy) of battery storage. Because of its size, it is a nationally significant infrastructure project so outside the standard local planning procedure. It is about four times larger than the previously largest solar station.

Electricity is exported from the project via the 400 kV National Grid substation at Cleve Hill, constructed to serve the London Array offshore wind farm in the Thames estuary to the north. A battery array will be placed at the substation, charging from the sunlight during the day and release the energy at night when it is needed.