Adding wiring is fairly cheap per mile, connecting different electric networks via substations is the more expensive bit.
The larger issue is capacity needs to be used regularly to be cost effective. If you want to send 10GW for 24 hour a day or 15 minutes they both need the same infrastructure.
The larger issue is capacity needs to be used regularly to be cost effective. If you want to send 10GW for 24 hour a day or 15 minutes they both need the same infrastructure.