All of these costs need to be adjusted for capacity factor. The 3.2 GW is the maximum rating of the line. The line will almost never be at the maximum rating (

All of these costs need to be adjusted for capacity factor. The 3.2 GW is the maximum rating of the line. The line will almost never be at the maximum rating (due to security-constrained economic dispatch). And obviously solar only generates when the sun is up (a mid-30s capacity factor is very good).