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Markets Magazine

The Biggest U.S. Electrical Grid Braces for Green Energy

PJM Interconnection’s new rules could usher in a massive buildout of offshore wind.


The decision that could open the floodgates to renewable power across much of the eastern U.S. came in early July after months of closed-door haggling within an organization many Americans don’t know exists.

PJM Interconnection LLC runs the country’s biggest electricity grid, a vast web of wires spanning parts of 13 states from the Jersey Shore to the Mississippi River and covering much of coal country. Its low profile is a measure of its success. PJM prides itself on keeping the lights on at a time when blackouts have plagued power grids in California and Texas, sometimes with deadly results.