A massive blackout just hit Jakarta, the capital city of Indonesia, and some neighboring provinces on 4 August 2019 and rendered around 20 million people without electricity for 9 hours. During this electricity outage, some people who don’t have enough power on their emergency lamps will switch to candle as the source of lighting due to its convenient and low price. However, it also possesses threats if not used properly.
It is reported that at least 50 houses were burnt down in Jakarta because of candles and unfortunately, one person died and another was injured in that incident.  It seems that using a candle is very dangerous and life threatening. So, should we avoid using candles during blackouts?
The answer is not necessarily so. If you have emergency lamps or other battery-powered lights, then it is suggested that you should avoid using candles and other open fire source of light. But, on the other hand, if you don’t have any other safer source of light during blackouts, it is okay to use them as long as you keep an eye on them.
There are 3 simple rules to follow from NCA (National Candle Association) that can prevent you from the 85% of candle fires. 
1. Never leave a burning candle unattended.
2. Never burn a candle on or near anything that might catch fire.
3. Keep candles out of the reach of children and pets.
By doing those 3 rules, you have just greatly minimized the risk of fire in your house. For more detailed safety rules of using candles, you can check the link  below. Remember, it’s better to be safe than sorry!
Those candle flames were like the lives of men. So fragile. So deadly. Left alone, they lit and warmed. Let run rampant, they would destroy the very things they were meant to illuminate.
Brandon Sanderson, The Way of Kings