The winter storm in Texas exposed the weaknesses in the state's power grid. But those weaknesses are far from unique to the state. Other southeastern states, like Oklahoma and Louisiana, also saw blackouts at the time.
Commerce would cease – Banks would close and automated teller machines (ATMs) wouldn't work if the power grid goes down. For a while, people with cash to spend may fare well. But as that cash runs out, they would likely begin trading with others for resources.
Communications would shut down – Cell phones, tablets and other gadgets that need to be charged would be rendered useless just hours after the power grid goes down, greatly limiting communication. That includes communication with police, firefighters and emergency medical services (EMS).
Transport networks would grind to a halt – Fuel pumps at gas stations would stop working if there is no power. Road signs, traffic lights and train systems would all go dead as well. And without a way to procure gasoline, car owners would have zero use for their vehicles. Establishments that heavily rely on deliveries, such as grocery stores, would be unable to restock.
There would be no running water – Critical infrastructures like water treatment facilities use power to run their pumps and equipment. Without power, water services would stop and there would be no running water. You won't be able to flush the toilet or run the shower.
Grocery stores and pharmacies would be stripped bare – People who didn't prepare for a power grid failure would rush to their local grocery stores and pharmacies to buy large quantities of food, water, medicine and toiletries. There would be millions of people like this, so it's highly likely that these establishments would be stripped bare within the first few days of a power grid collapse.
Satellite navigation devices would be useless – These days, many people rely on their cell phones, tablets and other gadgets for directions. If the grid goes down, people would be unable to charge their gadgets, which would eventually die. The average person will likely get lost if the grid goes down.
Stock up on food, water and other essentials – The biggest thing you need to worry about if power goes out is your water supply. You won't have clean, running water to drink or clean yourself with. Forget about last-minute grocery runs, too. Create an emergency stockpile of bottled water, food and other essential resources like matches and rubbing alcohol.
Prepare alternative heat sources – You wouldn't want to be without heating when it's cold out. Prepare alternative heat sources, such as an alcohol heater and a portable propane heater.
Prepare flashlights, lanterns and other light sources – Prepare a kit with several flashlights, batteries, lanterns and other light sources you may need.
Learn basic survival skills – Even if worse doesn't come to worst, it helps to know basic survival skills, such as building a fire, filtering water, building a shelter and fishing. (Related: How to make your own homemade water filter.)
Preparedness.news has more articles with tips on how to prepare for various disaster scenarios.