245 kV and 420 kV substations represent more than 65% of the installed SF6 gas [1] on the grid in Europe. A large plan in Europe and in the United Kingdom consists in refurbishing existing substations and installing a large number of new assets to support the integration of renewable energy. A successful elimination of SF6 can only be done by applying SF6 alternatives at these voltage levels. Following the successful completion of the LIFEGRID project aiming at the development of a 420 kV 63 kA Circuit breaker, the demonstrated ratings of the circuit-breaker and corresponding performance will be described. An outlook on the bay and circuit-breaker architecture will be introduced to underline the benefit and robustness of the design. An update on the type tests and performance available with the bay elements will also be exposed. Disconnector bus transfer and bus charging current switching characteristics will be detailed with a comparison between the existing SF6 and the g3 (CF4-based gas mixture) versions. Then, the available performances of the fast-earthing switch for induced current switching beyond IEC standard requirements will be detailed. Finally, an outlook of the progress of the first installation of the complete 420 kV GIS substation installation will be shown. The 420 kV GIS g3 Bay and Circuit-Breaker developments are now completed and type-tested. This opens the way to an eco-friendly, complete, economical, viable and immediate SF6 abandon.