Freezing weather knocked out generation and forced the largest controlled load shed in US history. Power loss spread to water systems and hospitals, and to patients at home on powered medical equipment.
PathPower → Devices → Human handoff
Sources checked when written 26 September 2026
TierA hospital lost water pressure and heat and began moving patients; power was shed across the grid. How tiers are assigned.
What happened
FERC and NERC reported that during the week of 14 February 2021, ERCOT averaged 34,000 MW of generation outages for more than two days, nearly half its all-time winter peak load. The controlled firm load shed of 23,418 MW was the largest in US history. The joint inquiry's recommendations include gas–electric coordination and mapping critical interdependent natural gas and electric infrastructure. Power loss stopped water treatment. In Austin, St David's South Austin Medical Center lost water pressure and heat because its boiler depended on water, and began moving patients. Its CEO said no single hospital could take a large number of transfers. Galveston and Houston hospitals also reported water problems, and about 800 people sheltered in Southeast Texas emergency departments seeking oxygen refills and power for home medical equipment.
The Texas Department of State Health Services confirmed 246 storm-related deaths. Twenty-five of them (10.2%) were from exacerbation of pre-existing illness, linked to disruption of dialysis or oxygen, frozen medical devices and medication, and loss of power to life-sustaining equipment.[1,2,3,4,5,6]
Documented harm
246 deaths confirmed as storm-related by Texas DSHS, including 25 from exacerbation of pre-existing illness tied to dialysis or oxygen disruption and loss of power to life-sustaining equipment. The hospital-level harm is not separately quantified.
What it teaches
A hospital with working generators can still lose heat because the boiler depends on city water.
Grid load-shed lists that leave fuel supply unprotected turn a power problem into a fuel problem.
Regional events remove the transfer destinations your plan assumed.
Hospital generators protect electricity, not the water, gas and heating that depend on the grid.
In a region-wide event the transfer plan fails because every neighbour is degraded at once.
Patients on home devices become ED patients when the grid fails.
Infrastructure interdependencies (gas → power → water) have to be mapped explicitly.
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A medical device problem: report it to the manufacturer and to FDA MedWatch.
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