.ScalableTestSuite.Power.ConceptualPowerSystem.Verification.OneGeneratorStepLoad .ScalableTestSuite.Power.ConceptualPowerSystem.Verification.OneGeneratorStepLoadTest case with a single generator. At time = 0, the load is reduced by 5%. Primary frequency control limits the frequency deviation to about 0.2 Hz, then the secondary frequency controller brings the frequency back to 50 Hz.