Renewable power is capable of reducing more carbon emissions per dollar and per year than nuclear energy, according to the recently released World Nuclear Industry Status Report (WNISR). The WNISR is about the nuclear industry, not by the nuclear industry—it's actually produced by an anti-nuclear activist. Naturally, the actual-nuclear industry disagrees strongly with the report's conclusions.
While the report does reflect the reality that renewable power is now faster and cheaper to build and operate, what that means for limiting carbon emissions is substantially more complicated.
The WNISR has been compiled annually since 1992 by Mycle Schneider, along with a range of other contributors. It has consistently made the case against investing in nuclear power.
This year's edition attracted wider attention after it was covered by Reuters. It argues that new nuclear power is both costlier and slower to build than new renewable capacity. "Costly and slow options avoid less carbon per dollar and per year than cheaper and faster options could have," the report says. These options "thus make climate change worse than it should have been: even though they are low-carbon, they still reduce and retard achievable climate protection compared to what was achievable." That is, spending on nuclear power wastes time and resources that would have been better spent on renewables, ultimately delaying decarbonization.
Saying that both renewables and nuclear are necessary for decarbonization is equivalent to saying that since "filet mignon and rice are both food, both are essential to combatting hunger," the report argues.
For instance, the WNISR argues that nuclear reactors are slow to build. Of the 63 units that have started running since 2009, the WNISR reports that the average construction time was 9.8 years. But that average time includes a large range of results—some took as little as 4.1 years, and some as much as 43.5 years. The slowest was the Tennessee-based Watts Bar 2 plant. Construction began in 1973 and was connected to the grid in 2016, but it faced long periods of delays, and construction halted for over 20 years.
"Inclusion of such outliers skews the average construction times reported upwards," says the World Nuclear Association statement. On the other hand, at the speedy end of the scale, reactors have been built in four years as a result of learning from "first-of-a-kind projects" and building subsequent projects more swiftly, it argues. So, while renewable capacity will still go on line more quickly, the gap doesn't have to be as severe as this report indicates.
Market forces are in favor of faster, cheaper renewables, says the WNISR, making them the obvious choice instead of nuclear power. And that has generally been accurate; renewable costs have plunged in most markets, making them some of the cheapest options available. However, a step away from nuclear does not necessarily mean a step toward renewables in locations where natural gas can also provide a cheap alternative.