Who makes load banks for AI data centers

Load banks are what a building is tested with before it has any computers in it. They are resistive or reactive elements that draw real power and turn it into heat, so the electrical and cooling systems can be run at design load, in the halls, under the conditions they will actually face — which is the only way to prove the plant works. The tests they enable are the ones worth doing: hold full load while the utility supply is cut and the generators start and take over; hold it while a UPS module is failed; hold it while a chiller trips and the standby comes up. None of that can be verified by inspection, and none of it can be tested at partial load, because the failures being looked for are thermal and dynamic and only appear near the design point. Most load banks are rented rather than owned, because a site needs megawatts of them for a few weeks and never again — which is why rental firms appear on this part alongside the manufacturers. What to look for is whether testing was done at full design load or at whatever load could be assembled, whether the load was placed in the halls or at the switchgear, since that changes what the cooling system is actually being asked to do, and whether reactive load banks were used where power factor matters.