To transmit power you will need battery storage on both sides of long distance power lines. We never build enough of them, but if you can peak shave and trough

To transmit power you will need battery storage on both sides of long distance power lines. We never build enough of them, but if you can peak shave and trough fill with stored power, you increase the MWH per day available on the far end. Solar tends to come with battery storage. But you could also just build the battery storage.