POWER REGIONS
Grid regions, explained.
The grid isn't one machine. It's a patchwork of interconnections and market operators, each with its own rules and quirks. Here's who runs what, in plain language.
ERCOT
Most of Texas · its own isolated interconnection
WHAT IS ERCOT? →
PJM
13 states + DC · the largest US market
WHAT IS PJM? →
CAISO
Most of California · the solar duck-curve grid
WHAT IS CAISO? →
MISO
15 states + Manitoba · wind-rich, long footprint
WHAT IS MISO? →
SPP
14 central states · record wind shares
WHAT IS SPP? →
NYISO
New York State · upstate hydro vs downstate gas
WHAT IS NYISO? →
ISO-NE
Six New England states · winter gas constraints
WHAT IS ISO-NE? →
Eastern Interconnection
Eastern two-thirds of North America
WHAT IS EASTERN INTERCONNECTION? →
Western Interconnection
Western North America · hydro + solar
WHAT IS WESTERN INTERCONNECTION? →
ENTSO-E
~35 European countries, one coupled grid
WHAT IS ENTSO-E? →
National Grid (GB)
Great Britain · coal-to-wind, fast
WHAT IS NATIONAL GRID (GB)? →