ENLIGHTEN aims at developing, integrating and testing a next generation post 800V electric vehicle powertrain with an indicative voltage level of 1200V. It targets a higher performing, cost optimized and more sustainable drivetrain layout that is also backwards compatible to the existing charging infrastructure with 1000V or 500V respectively. Determining exactly how high the new voltage level should be, to enable expected advantages in a systemic and systematic way is also part of the project. A new voltage level affects the entire sphere of electric mobility, both horizontally (vehicle, charging infrastructure, users, manufacturers) and vertically (OEM, tier1, tier2, single component supplier), hence a deliberate decision is required. To accomplish this an advanced electrical system architecture is presented by the ENLIGHTEN consortium in this proposal on whose basis a specific electric vehicle drivetrain will finally be developed and demonstrated in a C-segment vehicle. The at TRL5 delivered powertrain will consist of a dual voltage battery system and an integrated motor-inverter E-drive system, complemented by an intermediate DCDC converter, an AC and DC capable onboard charger and a power distribution. All power electronic devices will exploit low loss, ultra-fast switching gallium nitride (GaN) semiconductors for highest efficiency and to minimize cooling demand and component size. The dual voltage battery can be switched dynamically from one battery voltage into the other while driving. Through these and other measures, the ENLIGHTEN system delivers significant advances over the 2024 State of the Art. The ENLIGHTEN consortium includes 2 automotive companies, 1 Tier1 supplier and 2 SMEs. Their expertise is leveraged by the partnership with 2 research institutions and 4 academia/universities, constituting an ideal setup for strengthening the competitiveness of the European automotive industry.