Jan 15, 2018 · The Reactive Power Capability, AVR, PSS and Governor Performance tests are the final step before commissioning of a Resource. These tests are described in the ERCOT Operating Guides sections 2.2.5 (AVR), 2.2.6 Power System Stabilizers, 2.2.7 (Turbine governors), and 3.3.2.2 – 3.3.2.3(Reactive testing).