Not SPP. FERC. Winterization is required for any gear that's on an AC grid that crosses state lines. SPP is on the Eastern Interconnection. So all the players

Not SPP. FERC. Winterization is required for any gear that's on an AC grid that crosses state lines. SPP is on the Eastern Interconnection. So all the players in SPP are required to winterize. ERCOT is entirely inside Texas, so they had a choice. And they chose.... poorly.