Everywhere south of 48 degrees has a decent amount of solar resource nearby with at least 5% CF (enough to beat nuclear in price) in January. Using bifacials or

Everywhere south of 48 degrees has a decent amount of solar resource nearby with at least 5% CF (enough to beat nuclear in price) in January. Using bifacials or tilting the panels a little twice a year pushes this up to around 8%. Very few people live north of that and most of them are either within easy transmission range of an even better solar site or already have at least two of wind, hydro (which they use in winter), and nuclear covering most of their energy.