The big wind projects aren't "owned" by the UK/Scottish governments, they are private* assets built under a government license. Most likely an independent Scotland would continue to license these wind farms and the energy trade with the rest of the UK would continue under very similar terms.

* Actually, many of them are owned by non-UK governments.

Isn't it the other way around? British gov sells licenses for windparks for billions. It then guarantees electricity price to a certain degree. This would be presumably paid by the Scottish gov.