Crude Oil vs. Natural Gas

What to Know About the Price Relationship Between These Two Commodities

A pumpjack (oil derrick) and oil refinery in Seminole, West Texas.

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Crude oil and natural gas are both energy commodities. We use these fuels to heat and cool our homes or supply other energy needs. The price relationship between crude oil and natural gas is an inter-commodity spread. This means that the prices between the two change in relation to each other.

In an inter-commodity spread, when one becomes more expensive, the other becomes cheaper. Buyers are always seeking lower prices and higher supply.

What Is the Relationship Between Crude Oil and Natural Gas?

Many companies that produce crude oil also produce natural gas. Natural gas and crude oil exploration and production are often related. This is because the release and capture of natural gas can occur during the oil drilling process.

As related energy commodities, the prices of oil and natural gas have a historical price relationship.

The relationship between crude oil and natural gas changed around the turn of the 21st century due to the discovery of more natural gas reserves in the United States.

Huge natural gas reserves, previously undiscovered in the Marcellus and Utica shale regions of the U.S., changed the price relationship between crude oil and natural gas. The price of natural gas in the U.S. fell while the price of oil continued to rise between 2000 and 2014.

As the growth of emerging economies slowed and oil demand fell, the price of crude oil dropped drastically in late 2014. The drop continued through early 2016. By 2018, the price of crude oil crept back up to over $70 per barrel. But, due to the coronavirus in 2020 almost halting demand for oil, crude oil prices dropped to historic lows. Natural gas dropped a little, but held pretty steady.

Average Price Relationship Between Natural Gas and Crude Oil 

Up until 2009, the average price relationship between natural gas and crude oil was around the 10:1 level. Oil trades in barrels. Natural gas trades in millions of Btu's (British thermal units or MMBtu). The ratio translates to 10 MMBtu of natural gas per one barrel of oil. For instance, if the ratio was still 10:1 and the price of crude oil was $40 per barrel, natural gas would be priced around $4 per MMBtu.

The price relationship between the two commodities traded to highs of more than 50 to 1 in March/April 2012. At that time, the price of crude oil was over $120 per barrel and the price of natural gas was around $2 per MMBtu.

A return to long-term pre-2009 norms occurred starting in 2012 when natural gas prices began moving higher. In 2014, when natural gas prices began to decline, crude oil prices fell even more on a relative basis. The bear market in crude oil, which took prices from over $107 per barrel in June 2014 to below $45 in March 2015, caused the spread to drop to around 16 to 1.

By April 2020, crude oil prices reached historic lows as a result of the COVID-19 pandemic. Government orders to stay home sharply reduced the need for oil. At the end of April 2020, crude oil was priced at around $17 per barrel, while natural gas was priced at around $1.81 per MMBtu, bringing the spread to about 9:1.

On the futures market, each New York Mercantile Exchange (NYMEX) crude oil contract represents 1,000 barrels. Each NYMEX natural gas contract represents 10,000 MMBtu. But, the prices quoted for each on the futures exchange represent the price of one barrel of crude oil and one MMBtu of natural gas.

The Price Relationship in Competing Energy Products

Understanding the price relationship between two commodities that compete for the same uses can provide you with clues to future price direction. When one commodity becomes more expensive than the other, there is often a reason for it. In the case of oil vs. natural gas, it is usually supply and demand that drives the change.

Proven and probable reserves of natural gas cause a dramatic price drop. This causes the inter-commodity spread to become wider than usual. A return to historical norms in inter-commodity spreads can also be the result of substitution when consumers use one in place of the other.

Consumers will shun a costly commodity for a cheaper one. If oil prices increase, demand for natural gas will rise. This will cause a drop in oil prices and a rise in natural gas prices until the market stabilizes again.

The Bottom Line

The shifts in supply and demand can cause changes in inter-commodity spreads. Watching these price relationships can help you understand price dynamics.

So, inter-commodity spreads such as the one between crude oil and natural gas can be an important asset to add to your commodity investment tool chest. These spreads are another variable in the equations of investment science.