Paying it out before listing is the cleanest option, since it removes the complication entirely and lets the home sell as a straightforward owned-solar property, but it requires having the payout amount available in advance, on top of the legal fees of $800 to $1,500 every Saskatchewan closing already carries.
Transferring the lease to the buyer needs the leasing company's sign-off and a buyer willing to take it on, and some lenders will not finance a home with an assumed lease obligation, which can narrow the buyer pool. Negotiating the payout into the sale price shifts the cost into the transaction itself rather than requiring cash up front, but it reduces net proceeds.
Which route makes sense depends on your lease terms and your timeline. Get your hand-reviewed valuation from Joel Dyck.