The city heats itself twice.

THERMAL RESERVE AUTHORITY stores summer's surplus heat beneath Duluth and sends it back when lake wind drops the city below minus 18 F.

Founded in 1968, the Authority runs three underground caverns, 42 miles of insulated pipe, and a dispatch desk that treats warmth like a reserve fuel. Orange pipes, gray concrete, one rule: keep the city above the line.

Its annual report lists three caverns. The night operators keep a fourth gauge lit.

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