In the US, the lease cost per acre is typically $1k-$5k/acre/year over a 20-25 year lease. Feel free to back that out per kWh based on 1MW of solar per ~5 acres and ~1,460 MWh per year based on the four peak sunlight hours a day per the national average.
https://www.agweb.com/news/business/4-500-acre-plus-signing-...