It was based on by the Tesla technology invented by Nikola Tesla.
The Tesla Reactor employs Magnetohydrodynamic MHD Technology, where the plasma channel of the Tesla discharges, activates a electric current. Periodic breakdowns generate the vivid display of the cascading energy flow seen occasionally. It is believed that there is a Van De Graff generator, carries energy to the Core Orb, where it is stored. When the charge exceeds the containment capacity point, a breakdown occurs with the energy discharging to the base, activating the MHD Coil loop.
The first models of the reactor were originally used to power Soviet homes and buildings, providing a cheap source of renewable energy that was well suited to the tight purse string economy the nation had at the time. It quickly proved useful on the battlefield, both on account of its reliability and the fact that it didn't explode if ruptured, something other Soviet power suppliers couldn't claim. Also, the fact that the device could be constructed from cheap and affordable parts, some of which could practically be scavenged from destroyed machine hulks, only made it grow in popularity faster.
It requires more space to function and provides lesser power, but is cheaper than the Allied Power Plant. If a commander have 2 or more construction yards (one Soviet Construction Yard, and Yuri Construction Yard or GDI Construction Yard or Nod Construction Yard), the commander is likely to build the GDI counterpart, Nod counterpart or most probably the Bio Reactor.