Power Cut
If case of a power outage it is wise to unplug sensitive devices such as TVs, computers, hot tubs, and other electronically controlled equipment. Make sure that the stove, washing machines, and oven are turned off.
Have a flashlight and headlamp readily available (in the emergency kit).
There are various ways to cook during a power outage. A camping stove, grill, and other cooking appliances that do not run on electricity are useful here.
Water outage
If the water system goes down, it's important to have water for drinking and cooking.
It's a good idea to plan for 3 liters of water per person per day.
Use water sparingly.
Get advice from utility companies regarding things that could be damaged.
No internet connection
If there is no internet connection, you can't use credit cards. In that case, it's good to have cash on hand.
Air pollution
On Island.is, you can find various materials and instructions about air pollution from volcanic eruptions in Icelandic, English, and Polish. This includes gas pollution charts in these languages, which can be used to interpret recommendations based on measurements on the Environment Agency of Iceland website.