Natural gas is awkward to store and impossible to do without in winter. That combination makes storage levels one of the most watched numbers in energy markets. Going into the cold months, traders want to know one thing above all: is there enough gas in the tanks to get through, even if the weather turns harsh?
What gas storage is
Gas demand is highly seasonal. In winter, homes and businesses burn far more of it for heating, and in many countries, including the UK, gas also generates a large share of electricity. Production, by contrast, runs at a fairly steady pace all year. Storage bridges the gap. Gas is injected into storage during the warmer months, when demand is lower, and withdrawn during winter.
Most storage is underground, in depleted gas fields, salt caverns or natural rock formations. Some is held as liquefied natural gas in tanks at import terminals.
Why storage levels move prices
Storage is the market’s safety cushion. When stocks are high going into winter, a cold snap or a supply problem is less likely to cause a shortage, so prices tend to be calmer. When stocks are low, the market becomes nervous, and prices can spike on any sign of extra demand or reduced supply.
Traders compare current storage with previous years and with the five-year average. A level well below average is usually bullish for prices. One well above average tends to weigh on them.
The weekly reports
In the US, the Energy Information Administration publishes a weekly report on gas storage, usually on Thursdays. Traders compare the actual change in storage with what analysts expected, and a big surprise can move US gas futures sharply within seconds. In Europe, storage levels are tracked daily and reported as a percentage of total capacity.
It is similar to how oil traders react to weekly crude stock figures, explained in our guide to API and EIA oil inventories.
Why it matters for the UK
The UK has relatively little storage capacity compared with countries such as Germany or Italy, and relies on a mix of North Sea production, pipeline imports from Norway and shipments of liquefied natural gas. That makes British gas prices sensitive to European storage levels and to global competition for LNG cargoes. Wholesale gas prices feed through to household energy bills and to inflation, which in turn affects interest rate expectations.
What else moves the picture
Weather forecasts are the biggest short-term driver, especially in early winter. Supply disruptions, such as outages at major production sites or problems with key shipping routes, can also tighten the market. Demand from Asia matters too, because Asian buyers compete with Europe for the same LNG cargoes. For a related view of how energy prices reach consumers, see our guide to heating oil.
The bottom line
Gas storage is the buffer between steady production and seasonal demand. How full it is going into winter shapes how nervous the market feels, and that nervousness flows through to prices, bills and inflation.
Energy markets can move fast on small surprises. If you want to see how you handle that kind of volatility, take the free Samuel & Co Trading Trader Assessment.
