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Dominic Philpott, chief operating officer of Hanwha Phasor – a UK-based satellite relay firm now purchased by South Korean conglomerate Hanwha that serves both civilian and government clients – noted several shifts.

By letting engineers monitor the flow of power between the country’s three grids — one for the East, one for the West, and another just for Texas — the phasor units should give them enough time to identify and correct the sort of imbalance that sparked the 2003 blackout.

To prevent a repeat episode, engineers are installing 1,000 instruments called phasor measurement units that track the rhythm of currents across different points on the country’s power grids.

Phasor measurement units work by measuring the rhythm of current at different points on the power grid.

As Mr. Lemme spoke, he looked at a real-time display of phasor measurement units across the state.