> transmission via HVDC is extremely difficult to build due to land permitting and right of way laws It’s also really expensive due to the equipment that needs

> transmission via HVDC is extremely difficult to build due to land permitting and right of way laws It’s also really expensive due to the equipment that needs to be in place at either end of the HVDC link. Switching HVDC current is challenging and expensive, the stations at each end are hundreds of millions of dollars and around an order of magnitude more expensive than AC transmission stations. If you’re operating on the same grid frequency, it’s almost invariably more economic to run AC transmission lines. Voltage drop can be dealt with by transformers stepping up the dropped voltage periodically.