The sudden reduction in demand forced PJM operators to quickly reduce generation and deploy reactive-power resources as voltage and frequency rose. “A large load can therefore create reliability consequences both when it arrives and when it suddenly leaves,” Osnato said. “We are currently evaluating potential enhancements to reliability requirements, with consideration of existing and future industry ride-through standards and practices,” Matthew Wharton, PJM’s manager of reliability engineering, said. Federal Rules Are Also Taking ShapePJM’s review comes as federal regulators are developing reliability requirements specifically for computational loads. That means planners may need to distinguish between gross facility demand, routine grid imports, maximum grid imports, disturbance-response load, emergency grid dependency and flexible or curtailable load.