In even minor emergency situations, like a power outage, you need to have  a source of fuel, so it's definitely an essential of storage. These are the many  options you have for fuel  storage.
The type of fuel you store for heating, 
lighting  and cooking in an emergency will vary according to your living situation.  Gaining knowledge about the various options is helpful in order to make wise  choices. 
Firewood

While a family living in a home  with a large yard may have room for a good supply of firewood for a wood stove  or fireplace, apartment dwellers may have no such option and must find other  sources of fuel to heat or cook. If you can store firewood, there are some  guidelines to keep in mind. Rotten wood crumbles, smokes, and gives off very  little heat. Moisture encourages rot, so you’ll need to keep your woodpile  enclosed or covered to the best of your ability. Some people construct  woodsheds, store their wood on a covered patio or carport, or at the least,  cover it with a tarp or heavy plastic. Be aware that mice, spiders and some  snakes are very fond of nesting in woodpiles, so always wear gloves and be alert  when collecting an armload of wood! Some firewood needs to dry and age, referred  to as seasoning, for about a year to be suitable for burning. Freshly cut wood  still has sap in it, so it will burn at a low temperature and give off creosote,  a black oily residue, which can clog your chimney. A general rule is that  hardwood burns longer than softwood. Hardwood, such as apple, ash, beech, oak,  hickory, and maple, is more readily available in the eastern United States,  while softwood, such as alder, aspen, elm, cedar, cottonwood, pine, spruce and  redwood, are more available in the west. Woods that fall between the two and  burn acceptably include white birch, hackberry, larch, and swamp maple.
Wood is most often sold by the cord or fraction of a cord. A cord is 128 cubic  feet (4’X 4’X 8’). How long would a cord of firewood last? This is completely  dependent upon a several variables: Hardwood or softwood? Dry or damp? Seasoned  or green? Humid or dry weather? How many hours a day do you need to have a fire?  How many fireplaces? Are you cooking on a large wood stove, or a small Volcano  stove? The size of the stove will determine the amount and the size of the wood  stored. If you are storing wood for frequent, long-term usage or for emergency  heat and cooking, you’ll want to order it by the cord or pickup load rather than  purchasing the shrink-wrapped bundles from the supermarket. The supermarket  option would be prohibitively pricey, as would pressed wood logs. However, if  you have a wood burning fireplace with no outdoor storage space for firewood,  pressed wood logs are an option. In that case, try to buy your logs by the case  at a discount store rather than one package at a time at the corner store.  
If you have the time, energy and skill to cut and split firewood you may  want to let people in your community know that you’re willing to haul away the  wood from trees they’re having removed. You may be able to find someone willing  to do this for a portion of the haul. State parks will often allow some dead  wood to be harvested for a fee. Check with your state parks commission. Road  crews and 
utility  companies sometimes clear roadsides and leave wood to be picked up.  Check to see if this is a possibility in your area. In either case, be sure to  get permission! You will probably need a couple of strong helpers along with the  right equipment to do this type of a project. 
If you chance to subscribe  to a newspaper, you might want to recycle those papers by turning them into logs  for your fireplace. There are many ways people recommend doing this and many who  value its worth but there are also those who discount its effectiveness. You may  want to search the internet for ideas. 
Coal
Coal  burns hotter than wood, but requires a brick-lined fireplace or a stove  specifically designed for coal. In the case of either wood or coal, you must  have a way to deal with the ashes that are produced. Ashes must be completely  cold before being disposed of, as even a tiny spark, if you are not careful, can  cause a fire to flare up. Coal is messy to handle and to clean up after, and if  you don’t know just how to load, shake and rake it; your fire will go out. It is  more difficult to start burning than wood. Like wood, hard coal is available in  the eastern states and softer coal in the west. Also similarly, hard coal burns  hotter and longer than soft, and any coal supply needs to be kept dry,  preferably in bins, to be useful. Coal can be used in wood stoves, and takes up  less space than firewood for the amount of heat produced.  
Charcoal
Like regular coal, charcoal must be kept  dry to remain useful. One suggestion is to store it in covered metal cans such  as trash cans, in a covered place. Never attempt to cook with charcoal in your  house, as it consumes oxygen, although you may be able to use it in the middle  of a well-ventilated garage. Keep some form of a safe fire-starter on hand as  well, as charcoal can sometimes be stubborn about igniting.  
Canned Heat
This product is a gelled fuel made from  petroleum or alcohol. It comes in a small can and is stable to store and use  indoors, but remember to use in a well ventilated area. It won’t spill, lights  easily with a match, and is a dependable fuel for cooking or warming food. Most  brands need to be kept tightly closed when not in use, as the fuel will  evaporate quickly when exposed to the air. 
You might consider the  excellent product 
“Heat  Cell” fuel, which burns clean and odorless up to nine hours as a food warmer  or approximately four hours at cooking temperature—much longer than similar  products. Easily used with a flat-fold stove, it achieves maximum temperature  quicker than other fuels, contains no alcohol, does not evaporate, and is  totally biodegradable with no harmful emissions or pollutants. Unlike other  canned cooking fuels, it can be shipped by air transportation.  
Heat Tablets
For a cooking method that takes up very  little storage space or is easily portable, heat tablets may be the way to go.  First used by the military, these are made of three different  chemicals—trioxane, hexamine or methenamine (Hexamethylenetetramine). They light  readily and can be used as fire-starters or to fuel small stoves to heat water  or soup. Two hexamine tablets, for example, will bring a cup of liquid to a boil  in minutes, and will continue to burn for twelve to fifteen minutes. They should  be used outdoors or in well-ventilated areas (especially Trioxane), and care  should be used not to burn yourself by getting too close to the invisible flame  as it is extremely hot. Protect your stove from the wind if possible. If you  find yourself without a stove, you can create a small one by cleaning a tuna can  and punching a few holes in the side of it for an oxygen supply. Set the can on  a level, fireproof surface, burn a tablet or two in it, and place your pan on  top of the can. These tablets are shelf-stable and will last for a long time.  They do not evaporate, except for Trioxane, which will do so if there is even a  pin-prick in its packaging. 
Propane
Propane can be purchased in  small 16.4 ounce cylinders about the size of a lunchbox thermos bottle, or in  the familiar five-gallon (20 lb-propane weighs about 4 lbs per gallon) tanks  typically used with outdoor grills. Like all liquid fuels, do not store propane  inside your home. Propane works well to power outdoor cook stoves or barbecue  grills. Propane provides about 91,000 BTUs per gallon. A small two burner  propane stove in which each unit has a 12,500 
BTU burner  (25,000 BTUs total) will use up a 16.4 ounce cylinder in almost a half hour at  full power using both burners. It will take about 18 hours to deplete a 5 gallon  (20# tank) with both burners using the full 25,000 BTUs. Obviously, most people  do not use their stoves at full power so a 20# tank would last most people  anywhere up to or maybe beyond a hundred hours of cooking.  
Butane
Also pressurized in canisters, butane is safe  to use, burns completely with no residue, smoke or odors, and can be used  indoors in a ventilated area. It provides about 84,800 BTUs per gallon so it  would be close to the same time usage as propane. Butane’s disadvantage is that  it does not work well in cold temperatures, so you will want a back-up plan if  you live in a potential cold climate. Some companies have created a mixture of  butane, isobutane and propane to help alleviate this concern.  
Kerosene
Before you buy a kerosene lantern, stove or  space-heater, check with your local building code authorities or fire department  to see if their use is permitted in your community. Today’s kerosene appliances  for cooking and heating are safe and reliable. Purchase the kind that  automatically shuts off if it is tipped over or malfunctions in any way. Be sure  that you use clear, certified 1-K grade kerosene. Always keep kerosene in  containers specifically designed and dedicated to storing kerosene. DO 
NOT mix kerosene and gasoline or try to store or use them  interchangeably as they are not at all the same thing, and combining even small  amounts can greatly increase the risk of fire or explosion. Kerosene is  traditionally stored in blue containers. When heating with kerosene (or any  fuel), keep a window open an inch or so to dilute the small amount of carbon  monoxide emitted by the burning kerosene to a totally safe level.  
Lamp Oil
A clear-burning, smokeless refined liquid  paraffin, lamp oil may be stored in the container it came in, or in your lamp to  be ready for use. An ounce of lamp oil will last approximately five hours. While  it may not provide the ambience of a “hurricane” lamp, the 100-hour Candle also  burns liquid paraffin and is an excellent, affordable, safe product for  providing dependable light for a long period of time. 
White  Gas
Also known as camping fuel or by the familiar brand name Coleman  Fuel, white gas is unleaded gasoline that has been cleaned and modified to work  well in camping equipment. It is one-third the cost of propane cylinders, but  the downside for some people is that you need to pour it into tanks attached to  your equipment and then pump up the pressure. It also produces more carbon  monoxide emissions than most other fuels, so must be used only outdoors.  
Gasoline
Normally gasoline that is kept at home for  use in lawnmowers, generators, and other tools or appliances is kept in a red  container to distinguish it from any other substance. Gasoline’s shelf life is  short, generally only a month or two, so you’ll want to rotate your supply and  use it while fresh. For this reason, it’s not reasonable to store more than  you’re likely to need in a month or two. One way to do this is to empty your red  can of gasoline into your car’s tank and refill the can every month or two.  Gasoline is extremely volatile, use it with much caution and only for your  automobile or other appropriate unit that was designed to use it.  
Matches and Lighters
Wooden matches are much more  reliable than small book matches as they are sturdier and don’t absorb moisture  as readily. Even better are the fireplace matches with long “stems,” which are  safer to use for lighting wood fires, charcoal or appliances. Keep them in a  tightly-closed container and they will last for years—or purchase a supply of 
windproof/waterproof  matches. These are designed to light in adverse conditions. 
Lighters  vary in their usefulness. The long-barreled butane lighters are good for  igniting most things (other than lanterns with very small openings), and some of  them can be refilled, but cigarette lighters are not as useful, as there’s no  way of directing the flame downward and it will burn back toward your fingers.  Emergency Essentials carries several fire starter devices, including 
Fired  Up emergency fuel and fire starter. Two cups of this granulated product will  burn for about half an hour, and the product has a thirty-year shelf-life.  
The best advice on storing fuels is to know your substance and how to  care for it, and to treat anything flammable with great respect. Anything  flammable should be stored in a red container. This lets service authorities  know that the contents could be dangerous if exposed to certain conditions such  as high temperature, fire, etc. 
Fuel is a powerful, essential resource,  especially in an emergency. Follow any owners manual instructions and the above  precautions and they will help you be both safe and prepared.
Article from LDS Living - Emergency Essentials - October 4, 2011