@Jay Hinrichs pinged me so I am posting. Note that my experience is limited to NC, SC, VA jurisdictions, so keep that in mind when reading this or my other posts about solar.
Regarding "Solar farm land lease is generally very profitable," on the east coast at least, that is not necessarily true. There was a time, briefly (a few years), about a decade ago when some prime solar farm site owners signed favorable LTLs (Long Term Leases.)
Regarding "...about 50%+ of the option will not go through." The real numbers, per the U.S. Department of Energy under Contract No. DE-AC02-05CH11231, are not great: "Only ~20% of projects (14% of capacity) requesting interconnection from 2000-2018 reached commercial operations by the end of 2023. Completion rates are even lower for solar (14%) and battery (11%) projects."
Regarding Interconnection, keep in mind (same reference as the above link) "The typical project built in 2023 took nearly 5 years from the interconnection request to
commercial operations." Also, for ground-mount systems, most developers require 200-300+ contiguous acres, a relatively flat parcel, no wetlands or endangered species, and three phase power line access adjacent to the property. For distribution connected projects, the property needs to have close proximity (ideally adjacent) to a utility substation. Larger projects (e.g. 50MW+) generally interconnect with the transmission operator facilities, so you'll need transmission lines close by. For example, on Duke Energy's Warsaw site, collectively 87.5 MW, the developer built a new substation off Penny Branch Rd. since the generation facilities exceeded the existing distribution capacities. On Google Earth, use the two dates 4/2017 and 1/2018 to see the build-out. (Google Maps location)
I'm not sure what the "wholesale export rate" means. In general, developers will model revenue with SAM or an equivalent tool for non-dispatchable production. I am most familiar with fixed rate PPAs with rates that change by season (monthly summer, winter, shoulder) and time (hours on-peak, off-peak). The wholesale electric rates depend on location and time-of-day in 5-minute intervals. Wholesale rates generally average $0.02 to $0.05 per kWh.
Most west coast IPPs deploy solar with energy storage systems (ESS) to time-shift out of the low to negative margin day rates. The CAISO (California ISO) real time markets routinely go negative in summer from 10AM to 2PM (solar peak time), meaning the customers with non-dispatchable roof-top solar will be charged for putting solar onto the grid. During solar peak time, the CAISO market also routinely sees generation from renewables exceed the total grid load, which is quite incredible. See https://www.gridstatus.io/live for the real-time grid monitoring, status, and rates.