TGK PG (Russian: Транспортный Грузовой Корабль Повышенной Грузоподъемности (ТГК ПГ), lit.
[1][2] The initial development contract was awarded to RSC Energia by Roscosmos on December 11, 2015.
[3] It would consist of a service module on the aft, an unpressurized propellant cluster of six tanks on the center, a pressurized module with docking adapter on the fore and a truss structure connecting all the parts.
It would use the reaction control system of the Progress-MS and an orbital manoeuvring rocket engine already developed for another spacecraft.
The new design would have a single deposit of propellant that could be used by the spacecraft or to refuel the space station.