The billionaire philanthropist said green energy was not to blame for the widespread blackouts that hit Texas last week as its power grid faltered.
The email error made customers worry that they owed $200,000 to CenterPoint Energy.
More than 4 million Texas residents were left without power in a state largely dependent on oil and gas.
"Mother nature is dealing us a rough hand tonight," the Sacramento Municipal Utility District said Tuesday evening.
Massive thunderstorms swept across northern Texas, prompting tornado warnings and causing major damage to buildings in Arlington.
Iota is expected to make landfall in nearly the exact same location where Hurricane Eta did about two weeks ago, according to the National Hurricane Center (NHC).
There are more than 2.2 million power outages reported across Georgia, Louisiana, Oklahoma, Alabama and Mississippi, as of Thursday.
Delta, now categorized as a post-tropical cyclone, "continues to be a heavy rainfall threat," the National Hurricane Center warned Sunday.
After making landfall Friday, "rapid weakening is anticipated and Delta is forecast to fall below hurricane strength," the National Hurricane Center said.
Tropical Storm Teddy is "likely to cause life-threatening surf and rip current conditions," the National Hurricane Center warned.
Hurricane and storm surge watches have been issued for most of southern Louisiana, including New Orleans, and southeast Texas, the National Weather Service (NWS) confirmed earlier.
At least 400,000 residents of Puerto Rico were reportedly left without power after outages struck the territory only hours before Tropical Storm Isaias was expected to form.
Hurricane Hanna first hit land in Padre Island in Kenedy County, Texas; the maximum sustained wind speed is 90 mph.
The storm has been gaining strength and is expected to make landfall over the weekend, leading to a state of emergency in Louisiana.
Officials estimate the search and rescue operation took approximately 15 hours and no serious injuries were reported.
More than 2.5 million people have been evacuated from coastal districts in India's West Bengal and Odisha states, as well as areas of Bangladesh, in response to Wednesday's severe storm.
Heavy rainfall is expected in the sub-Himalayan region of West Bengal as well as the Indian states of Sikkim, Assam and Meghalaya through Thursday.
The damage was severe in several parts of Indiana, where trees and utility poles were downed during the storms.
Tornadoes were reported in Texas as strong northeasterdly winds brought rain and thunderstorms to large parts of the state.
Benjamin Charles Fitch, 27, was last seen walking in Mt. Juliet, Tennessee an hour before a tornado hit.
A strong winter storm is expected to blast across the Plains, Midwest and northeast of the country this weekend before strengthening into a bomb cyclone off the coast of New England and hitting the Atlantic Canada region.
Four people are reported to have been killed by extreme weather in the past couple of days.
A string of schools are closed or on a delayed opening schedule in parts of the Northeast, including in Connecticut, Massachusetts and Rhode Island in the aftermath of a severe winter storm.
Severe storm systems heading to parts of the Central states, and potentially spreading south and east, are predicted to cause major travel disruptions on the busiest day of the year for Thanksgiving holiday commuters.
Storms whipped across the Northeast on Thursday night, bringing fierce winds and causing trees to fall.
Severe weather affected many parts of the eastern United States on Thursday evening and Friday morning.
A low pressure system is expected to bring thunderstorms and rain to trick-or-treaters all the way from the Deep South to much of the East Coast on Thursday.
Super Typhoon Hagibis has killed dozens of people in Japan as the government mobilizes thousands of troops to assist in rescue efforts.