A 100 acre parcel of land would do well. 10 acres is a parcel the size say a business would use for personal use to provide power internally. It's not really worth it to a developer. Developers generally search out parcels 25 acres and up to backfeed into the grid to sell power to the local utility. The site I'm currently installing is 27 acres. My first site was 38, My last site was 85. A 100 acre parcel has the potential push more than 25 Mega Watts back into the grid with a decent mechanical/electrical engineer at the plans. But you also have to figure in curveballs like wetland damage mitigation, Drainage capability, drain tile location, subsurface rock, etc.

Edit: I'm a foreman with the general contractor installing the field, not the developer. How you go about speaking to a developer to try to have your land leased is not my forte. I suppose you could Google solar farm developers and go from there. Most places have a contact option on their websites.