Solar, wind bodes well for carbon fight
Shell recently published two energy security scenarios, its latest in a long series of thorough and (at least to energy analysts) memorable views into energy’s possible futures. The first, called “Archipelagos”, is an extension of the world’s path; the second, “Sky 2050”, works backwards from an idealised outcome of net-zero emissions and limited global temperature increase.
(The Sky 2050 scenario sees high oil prices incentivising demand reduction. That is a prospect countries grappling with rising inflation, may face after Opec+’s unexpected decision this weekend to cut output.)
THRESHHOLD
The report is packed with charts and projections, but one historical chart is worth exploring.
Shell examined the four major energy technologies to emerge in the past six decades: nuclear power, liquefied natural gas (LNG), and solar and wind power. Each technology needed years before it made a meaningful, if minor, contribution to the global energy supply, a threshold Shell sets at one exajoule annually. (An exajoule is 277 terawatt-hours [TWh] close to Mexico’s consumption in 2019.)
For example, the first gridconnected nuclear power plant began operations in the Soviet Union in 1954, and nuclear power reached 1 exajoule of global supply 19 years later. Solar took more than three decades to contribute an exajoule of supply, with the first commercial solar projects built in the early 1980s and the first exajoule not reached until 2016.
A technology’s speed after it hits that milestone is much more important than its speed before. Nuclear power doubled in the four years after, then doubled again in another five years. It now supplies more than eight times as much energy as it did 50 years ago. LNG had a slower start, taking nearly a decade to go from one exajoule to two, and the same time again to go from two to four. Its progress leapt ahead in the late 2000s, nearly two decades after it supplied its first annual exajoule. But it still provides less energy than nuclear power now.
Wind is growing more rapidly than LNG. Both took decades to reach their first exajoule, but wind has risen at a faster pace than LNG since. Wind was on an almost identical path to nuclear power. But it has accelerated, and now supplies nearly 30% more energy in its 14th year past the milestone than nuclear did.
Solar is on its own path. A year after hitting the milestone, it already exceeded nuclear’s supply at the same stage. In its seventh year as a significant energy supplier, solar accounted for almost one-and-a-half times as much energy as nuclear. It supplied nearly two-and-a-half times as much energy as LNG six years post-exajoule.
This is a striking finding, and it is also promising for decarbonising global energy, with one major distinction worth noting.
Global energy consumption has more than doubled in the 50 years since nuclear reached the 1 exajoule mark. In 1973, the world consumed 238 exajoules of energy; in 2021, it consumed 595, according to the latest BP Statistical Review. That means that in the year that nuclear first appears as a significant energy contributor, it supplied about 0.4% of the energy the world used. By the time LNG hit an exajoule, it provided about 0.3%. By 2016, when solar provided its first exajoule, it met less than 0.2% of much-increased global energy demand.
On an absolute basis, the newest energy technologies are the fastest growing in at least 50 years. On a relative basis, though, they have more work to do to have the same global effect. Wind and solar together now generate more electricity than the world’s nuclear power fleet, but to have the equivalent effect that nuclear power had in the 1970s and 1980s, they will need to grow about twice as fast.
Fortunately, they are. Research group BloombergNEF expects 316GW of solar power to be added this year, and more than 110GW of wind power as well. That continued growth would keep the trends in Shell’s chart fresh: the two fastestgrowing energy technologies of the past five decades are likely to continue on their path, and continue having the effect they have now.