Comments on Invenergy’s request for a technical conference related to the interconnection of interregional MHVDC systems filed by: Advanced Energy United, NRDC, IRC, SPP, NARUC, Amer. Council on Renewable Energy, Assoc Industries of MO, Clean Energy Buyers Assoc, Converge Strategies, ELCON, Grid United, IL Manufac. Assoc,  MN PSC, Natl. Elec. Manufac. Assoc, ND PSC, Public Citizen, Niskanen Center, Prysmian Group, P. Stockton, R Street Institute, Rail Electrification Council, Renew Missouri Advocates, SOO Green HVDC Link ProjectCo, World Resources Institute,