https://gridaxon.io/insights/ Engineering perspectives on grid modernization, resource integration, and energy AI. en-us Tue, 03 Nov 2026 12:00:00 GMT https://gridaxon.io/insights/sso-ercot-10-mw-5-second-rule.html https://gridaxon.io/insights/sso-ercot-10-mw-5-second-rule.html Tue, 03 Nov 2026 12:00:00 GMT info@gridaxon.io (Satish Natti) Large Loads & Data Centers SSR & Oscillations ERCOT's proposed power variation limit caps how much a large computational load, such as an AI data center, may swing its demand. The draft language allows no more than 10 MW peak-to-peak of active power variation in any rolling 5-second window, measured across 0.1 to 55 Hz. The purpose is to protect the shafts of nearby synchronous generators from fatigue and damage. https://gridaxon.io/insights/sso-terminology-field-guide.html https://gridaxon.io/insights/sso-terminology-field-guide.html Tue, 03 Nov 2026 12:00:00 GMT info@gridaxon.io (Satish Natti) SSR & Oscillations Sub-synchronous oscillation (SSO) is the umbrella term for any oscillatory exchange of energy between the grid and a machine, converter, or other device below the system's rated frequency. Everything else in this field (SSR, IGE, TI, TA, SSTI, SSCI) is a specific mechanism underneath that umbrella. The mechanisms differ in what is interacting, whether a series capacitor is required, and how you screen for them. https://gridaxon.io/insights/sso-why-oscillations-are-back.html https://gridaxon.io/insights/sso-why-oscillations-are-back.html Tue, 03 Nov 2026 12:00:00 GMT info@gridaxon.io (Satish Natti) SSR & Oscillations Large Loads & Data Centers Sub-synchronous oscillation (SSO) is an exchange of energy between the power system and a generator, a converter, or a load at a frequency below 60 Hz. When the system cannot damp that exchange, it grows. Turbine shafts crack, wind turbines trip, and in the worst historical cases the damage happens in less than a second.