Home Node Security ‹ Node Security Energy security, reliable supply, resilient systems and long-term national readiness. SAIDI SAIFI SARFI Grid System Operation System Average Interruption Duration Index SAIDI Overview ↗ Formula System Average Interruption Frequency Index SAIFI Overview ↗ Formula System Average RMS Frequency Index SARFI Overview ↗ Formula Grid System Operation About Grid System Operation ↗ Malaysian Codes