Is renewables-based electrification the way of the future?
Innovations in the electric power sector could give electricity the lead over fossil-based combustion fuels in the world’s energy supply by mid-century.
According to a new study from the Potsdam Institute for Climate Impact Research (PIK), when combined with a global carbon price, these developments could catalyse emission reductions to reach the Paris climate targets, while reducing the need for controversial negative emissions.
“Today, 80% of all energy demands for industry, mobility or heating buildings is met by burning (mostly fossil) fuels directly, and only 20% by electricity. Our research finds that relation can be pretty much reversed by 2050, making easy-to-decarbonise electricity the mainstay of global energy supply,” said Gunnar Luderer, author of the new study and researcher at PIK, as well as Professor of Global Energy Systems Analysis at the Technical University of Berlin.
“For the longest time, fossil fuels were cheap and accessible, whilst electricity was the precious and pricier source of energy. Renewable electricity generation — especially from solar photovoltaics — has become cheaper at breathtaking speed, a pace that most climate models have so far underestimated. Over the last decade alone prices for solar electricity fell by 80%, and further cost reductions are expected in the future. This development has the potential to fundamentally revolutionise energy systems. Our computer simulations show that, together with global carbon pricing, green electricity can become the cheapest form of energy by 2050 and supply up to three-quarters of all demand,” said Luderer.
More end uses for electrification than you might think: cars, heating and steel production
The reasons for this lie mainly in the groundbreaking technological progress in solar and wind power generation, but also in the end uses of electric energy. Costs per kilowatt hour for solar or wind power are steeply falling, while battery technology, eg, in cars, is improving at great speed. Heat pumps use less energy per unit of heat output than any type of boiler and are becoming increasingly competitive, not only in buildings, but also in industrial applications.
“You can electrify more end uses than you think and for those cases actually reduce the energy consumption compared to current levels,” said Silvia Madeddu, co-author and researcher at the Potsdam Institute.
“Take steel production: electrifying the melting of recycled steel, the so-called secondary steel, reduces the total process energy required and lowers the carbon intensity per tonne of steel produced. All in all, we find that more than half of all energy demand from industry can be electrified by 2050.”
However, some bottlenecks to electrification do remain, the researchers point out. Slowest in the race to decarbonisation are long-haul aviation, shipping and chemical feedstocks, ie, fossil fuels used as raw materials in chemicals production.
Limiting the reliance on negative emissions
The scale of the technological progress holds great opportunities for countries to leapfrog and for investors alike. However, not every technology is a success story so far.
“In this study, we constrained the reliance on technologies which aim at taking carbon out of the atmosphere, simply because they have proven to be more difficult to scale than previously anticipated. Carbon capture and storage has not seen the sharp fall in costs that, say, solar power has. Biomass, in turn, crucially competes with food production for land use,” said Luderer.
“Interestingly, we found that the accelerated electrification of energy demands can more than compensate for a shortfall of biomass and CCS, still keeping the 1.5°C goal within reach while reducing land requirements for energy crops by two-thirds.”
Era of electricity will come — but must be accelerated by global climate policy
“The era of electricity will come either way. But only sweeping regulation of fossil fuels across sectors and world regions — most importantly, some form of carbon pricing — can ensure it happens in due time to reach 1.5°C,” said Luderer.
Indeed, the simulations show that even if no climate policy at all is enacted, electricity will double in share over the course of the century. Yet in order to meet the goals of the Paris Agreement of limiting global warming to well below 2°C, decisive and global political coordination is crucial: pricing carbon, scrapping levies on electricity, expanding grid infrastructure, and redesigning electricity markets to reward storage and flexible demands. Here hydrogen will be a crucial chain link, as it can flexibly convert renewable electricity into green fuels for sectors that cannot be electrified directly.
“If these elements come together, the prospects of a renewables-based green energy future look truly electrifying,” said Luderer.
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