tl;dr
Из-за дождей в Калифорнии включились ГЭС, которые нагенерировали столько энергии, что ее некуда было девать. В результате на пиках цена на электричество была отрицательной.
In the past week, this phenomena has been exacerbated by the rains that we have had in California. The rains are causing more hydroelectric generators to turn on. Due to the drought (and low rainfall in general), those hydroelectric generators have been off for a good majority of the past few years, so their presence has caused a flood of cheap and sometimes uncurtailable energy to hit the state, creating these negative prices.
Из-за дождей в Калифорнии включились ГЭС, которые нагенерировали столько энергии, что ее некуда было девать. В результате на пиках цена на электричество была отрицательной.
In the past week, this phenomena has been exacerbated by the rains that we have had in California. The rains are causing more hydroelectric generators to turn on. Due to the drought (and low rainfall in general), those hydroelectric generators have been off for a good majority of the past few years, so their presence has caused a flood of cheap and sometimes uncurtailable energy to hit the state, creating these negative prices.