Hi @Candy7. You can add this extra information in the “further information” on your listing.
Also, take a screen shot of the formal message and this can be sent to guests as part of your initial conversation. You can state you have torches etc, in case this unknown power outage occurs. Then the guest can cancel if they wish to....
other things to consider:
1. Do you have running water if there is a power outage, as some places may not. If not, arrange to have some for cooking or cleaning.
2. Got a portable camping gas cooker?
3. Thermos for maintaining and storing some hot water in it. Keep it filled and hot.
4. Battery operated fans if needed.
5. LED candles
6. Glow stick or battery operated night lights
If expecting rolling power outages, you might want to consider a small generator (use wisely and not in confined spaces) to run your fridge etc.
Food and drink:
Do you have in this emergency, some simple tin food and a manual can opener? (if you have an electric one) Plus easy to fill tummy items likesome snack food, tinned tuna, cous cous or some packs of two minute noodles. Crackers or long life flat bread? Bottled water or juice. This can also make the pain of waiting for a meal, to go away, or make the meal!