VALLEY FORGE, Pa. — Operators of the nation's largest power grid are warning residents in 13 states that electricity demand driven by the coming winter storm will be historically high, placing high stress on the grid and increasing the risk of outages across large parts of the country.

Ukraine's energy ‌situation ​had "significantly" worsened on ‌Friday morning after recent Russian air ​attacks, triggering emergency power outages in most regions, ‍Kyiv's grid operator said. The ​dire assessment followed a remark ​by ⁠Energy Minister Denys Shmyhal on Thursday that the country's energy system had endured its most difficult day since a widespread blackout in November 2022,