“The power grid” is actually several different grids that operate across the country, and two of them — the Southwest Power Pool (SPP) and the Midcontinent Independent System Operator (MISO) — this week gave green lights to massive investments in new high-voltage power lines. The SPP’s board overwhelmingly approved a $7.68 billion transmission plan in the Great Plains, and MISO’s board committee expressed significant support for a $30 billion transmission portfolio, with $21.8 billion of that going to 4,000 miles of long-range transmission projects, which it estimated will deliver returns about 1.8 to 3.5 times their cost, particularly through $14 billion in reliability benefits.
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