Humans can survive without electricity.
Humans have survived for thousands of years without electricity before our homes had electricity.
Electricity has not even been around for 200 years so he years well before 150 years ago or so were lived without electricity.
People used candles, fires, lanterns, oil lamps, gas lamps etc for lights and also kept the perishable foods in ice and in the ground to keep the food cold.
People cooked on wood stoves and other fires and Kerosene stoves etc.
You could still survive without electricity today but it would not be very fun.
Around 13 percent of the world population or 940 million people in the world have no access to electricity or has no electricity.
3 billion (40% of the world) do not have access to clean fuels for cooking.
This comes at a high health cost for indoor air pollution.
South Sudan ranked as the least-electrified country in the world in 2019, with only seven percent of its population having access to electricity.
Chad fared only slightly better, with an access rate of eight percent.
Electricity won't run out because electricity is generated with electrical generators.
However the fuels that are use to generate most of the electricity will eventually run out.
Electric power plants operate on natural gas, fuel oil and coal although some electricity is generated using water through hydroelectric power plants.
For the power plants that operate using natural gas, fuel oil and coal those power plants will eventually run out of fuel to operate.
However for power plants that use hydroelectric as the source or water then as long as the water is flowing the electricity will still be generated.
Also we now have wind generators as well as Solar power so as long as we have the sun and wind we'll still have electricity.