You're mixing up two different things. Moving electricity with HVDC is easy and cheap... building the grid infrastructure is, well, not so easy or cheap.
The system cost depends on connection queues, transmission buildout, substations, transformers, planning permission, curtailment, etc.
Production of transformers, cables, and labour capacity are bottlenecks. Planning is a bottleneck.
The system cost depends on connection queues, transmission buildout, substations, transformers, planning permission, curtailment, etc.
Production of transformers, cables, and labour capacity are bottlenecks. Planning is a bottleneck.