Figure 24-24 shows a conceptual tokamak reactor device for producing electrical energy. Coolant such as water or helium gas removes heat from the first wall and Li blanket material and transfers it to the steam generator. Superheated steam at conditions of 925 psig (6.4 MPag), 570° F (299° C) is produced by the steam generator to power a conventional turbine-generator. The generator net output is approximately 1,000 MWe. The plant efficiency is 39%. The auxiliary power load for plasma heating systems, coolant pumps, and other balance of plant loads is approximately 20% of gross generation.