https://www.vice.com/en_us/article/n7vyvk/texas-tesla-owners-are-drawing-power-from-their-cars-during-blackouts

As Texans gradually regain power after days of catastrophic outages amid freezing temperatures, some Tesla customers are grateful for their electric cars which provided critical emergency power.

For example, one Reddit user posted in the r/Teslamotors subreddit that, after running out of firewood, the family including an infant slept in their Model 3 with the heat on while it was parked in the garage. This can be safely done in an electric vehicle because it produces no emissions, but would be fatal with a gas-powered car that emits toxic carbon monoxide. Carbon monoxide poisonings have skyrocketed in Texas this week, and two people in Houston died from carbon monoxide poisoning while sleeping in the family car in the garage while it was running.