An international metrology project named “EMPIR 19ENG02 FutureEnergy” started in June 2020, is developing, building, and evaluating measurement equipment and systems for the UHV level. This paper describes the work on a new reference UHVDC voltage divider for the calibration of testing equipment up to at least 1600 kV. This divider has a modular design and target expanded measurement uncertainty of 200 μV/V. The need for such measurement systems results from new measurement methods for future energy transmission grids. After the construction of the UHVDC voltage divider, the targeted measurement uncertainty of 200 μV/V was successfully at 1200 kV during a measurement campaign at PTB. The linearity and temperature dependence of the UHVDC divider modules as well as the overall results of this new divider are included in this work. This work will lead to new calibration and measurement capabilities (CMC) for traceability of the designed divider systems for participating national metrology institutes (NMI).