The lag time is all that's needed (spike, price plateau, drop in price). Utilities need stable prices due to rate setting policy between them and the PUC (although some jurisdictions are more friendly to floating fuel prices passed through to consumers than others), so you take advantage of the price volatility while the domestic O&G market is in turmoil, and producers and well developers are going bankrupt or otherwise having their operations disrupted by the macro environment. Doesn't matter if the price of nat gas declines again if you've already built the batteries and renewables.