HVDC Is the Backbone of a Continental Grid

High-voltage direct current (HVDC) transmission is the only economically viable technology for moving large renewable energy blocks over distances above ~500km with acceptable losses. Europe is building a multi-billion euro HVDC overlay; the U.S. has approximately 11GW of HVDC in development (SunZia, Grain Belt Express, TransWest). The equipment market is an effective duopoly between Hitachi Energy and Siemens Energy — both are running 3–4 year backlogs on converter stations. This equipment scarcity is the binding constraint on transmission buildout timelines, not permitting in many cases. Investors in transmission developers should be pricing delivery risk from this bottleneck explicitly; it's currently underweighted in most project-level underwriting.