Humans are not nocturnal creatures. A simple flashlight or candle provides a sense of security, intertwined with the ability to see otherwise invisible details. Whether in a long term or short term sense, the power grid fails. This is true regardless of country, location, or nationality. A system built by man is a flawed system, and no matter how small the chance, it will fail at some point.
If you accept that a power failure is a possibility, and already have a few flashlights stored along with some batteries, you are already more prepared than many individuals out there. When it comes to emergency power, there are different types to be considered; those for short term disasters, and those for long term sustainability.