The Texas Grid Was 4 Minutes From Collapse. Here's How the Grid Stays Balanced.

Just before 2 a.m. on February 15, 2021, the Texas power grid was minutes from collapse, and it all came down to one number: 60 hertz. The grid stores very little electricity, so supply has to match demand every instant, and frequency is how operators keep score. This video explains how generators spin in lockstep, the layers of defense that catch a sudden loss, why rolling blackouts are the last resort, and how close Texas came. Previous episode: How the Fed actually sets interest rates    • The Fed Doesn't Set Your Interest Rate. He...   CHAPTERS 00:00 Minutes from collapse 00:44 Supply meets demand 01:26 The beat: why frequency is the scoreboard 02:13 Layers of defense 03:11 The last resort 03:49 Four minutes in Texas 04:41 How the pieces fit SOURCES ERCOT, Review of February 2021 Extreme Cold Weather Event (presentation to the House Energy & Commerce Committee, March 2021) https://docs.house.gov/meetings/IF/IF... University of Texas at Austin, The Timeline and Events of the February 2021 Texas Electric Grid Blackouts (July 2021) https://energy.utexas.edu/sites/defau... FERC and NERC, Final report on the February 2021 freeze (November 2021) https://ferc.gov/news-events/news/fin... KUT / Texas Standard, Texas power grid was 4 minutes and 37 seconds away from collapsing (February 24, 2021) https://www.kut.org/energy-environmen... NREL, Inertia and the Power Grid: A Guide Without the Spin (May 2020) https://www.nrel.gov/docs/fy20osti/76... ESIG, ERCOT Regulation Service https://www.esig.energy/ercot-regulat... ERCOT, Day-Ahead Market https://www.ercot.com/mktinfo/dam U.S. Energy Information Administration, balancing authorities and interconnections https://www.eia.gov/todayinEnergy/det... ABOUT THIS VIDEO The frequency curve in "Layers of defense" and the cascade in "The last resort" are illustrative, not measurements. The three-grid map is a schematic. 3,600 rpm applies to two-pole generators, the common design for large steam turbines. ERCOT's slides put the dip below 59.4 Hz near 1:51 a.m. and UT Austin puts the 59.302 Hz low near 1:55 a.m. Batteries and pumped hydro do store power, but still little next to total generation. Spotted an error? Say so in the comments and it will be corrected here.