When we electrify our energy systems, a magical item happens: ample inefficiencies vanish. As the International Energy Agency puts it: “Electrification is efficiency”.
In a decarbonised world, our final energy petition is much lesser than it is today. A study by the Oxford Professor Nick Eyre suggests it’s concerning 40% lower.1
This is shown in the diagram below. It parcels earth final energy petition today2 compared to a ‘post-transition’ energy scheme anywhere suitable sectors are electrified, and the remainder is fuelled by hydrogen.
Electricity petition does addition – from 110 to 189 EJ, but total energy petition drops from 416 to 247 exajoules (EJ).
This is a fairly simplistic example of the earth energy transition, but I think it’s a precious one. I worked through Nick’s numbers to see what’s going on and volition obtain you through them below.
A few assumptions to start:
It doesn’t assume any effectiveness gains another than electrification or a move to hydrogen. This is apt to underestimate the decrease in energy demand.
It’s a difference of energy use today: it doesn’t document for energy growth as countries develop. This shouldn’t really power the ratio between the two scenarios; lone the final numbers.
All non-electrified sectors volition be powered by hydrogen. I’m certain several would differ and propose that a few sub-sectors volition eventually be electrified, or another alternatives – specified as biofuels for aviation – have to be used instead. This won’t alter the general conclusion, so awareness liberated to ideate that several of these sub-sectors are powered by non-hydrogen alternatives.
Cars are uncomplicated to electrify, high-temperature manufacturing processes aren’t.
The current and post-transition energy petition by field is shown in the diagram below. Energy petition for transport and buildings autumn considerably – we can electrify a lot of highway transport, and toggle our gas boilers for electric warmth pumps.
There are small opportunities for industry. Some manufacturing processes specified as area heating can be electrified, but high-temperature manufacturing processes can’t.
We can also interrupt this downward by the mix of energy and power in all sector.
You can see that pre-transition, fuels (burning fossil fuels directly) dominate. Electricity lone accounts for one-quarter of the final energy demand.
In the post-transition system, power supplies three-quarters. The remainder is assumed to be supplied by hydrogen, in sub-sectors that can’t be electrified at the moment.
I’ll now go through all of these sectors in additional detail.
Electric vehicles are about four times as productive as petrol. In a petrol car, lone 20% of the energy is converted to motion. In electric cars, this is about 80% (with several assortment reliant on regenerative braking). I wrote concerning this extensively in a previous article.
As you can see in the diagram below, the post-transition energy petition for cars and vans is concerning one-quarter of the current demand.
For heavy-goods vehicles (HGVs), it’s assumed that about fractional of the extend travelled can be electrified. The another fractional comes from hydrogen energy division electric vehicles.
Buses are 80% electrified, alongside lone long-distance buses powered by hydrogen.
Rail is completely electrified.
Short-haul aviation is electrified, but medium- and long-haul requires hydrogen. So, lone one-third is electrified.
Only 10% of marine transport is electrified – this is short-distance trips, specified as ferries.
Buildings are nearly entirely electrified, and accomplish enormous effectiveness gains.
The biggest person of energy in buildings in temperate climates is space heating. There are ample effectiveness gains from moving to electric warmth pumps.
Nick Eyre suggests that 100% substitution is non-economic during ample petition peaks in winter, so 90% are replaced alongside warmth pumps, and 10% comes from hydrogen.
Water heating is entirely replaced by electric warmth pumps.
Cooking is entirely electrified. The big decrease in energy petition current is partially caused by a passage distant from ‘traditional biomass’ in lower-income countries.
Lighting is already electrified, so there’s small alter there.
Industrial energy is harder to tackle.
Some high-temperature processes are moved to hydrogen. Most effectiveness gains happen from the alloy industry: about 25% of the field is powered by electric arc furnaces. It’s assumed that this increases to 50% (the current mix in OECD countries).
Low-temperature processes are reliant on steam. It’s assumed that fossil fuels are replaced alongside electric boilers, which are about 20% additional efficient.
Drying and separation processes below 120℃ can be converted to warmth pumps using existing technologies.
Space heating can additionally be transitioned to electric warmth pumps.
This uncomplicated idea test shows that electrifying our energy scheme as much as imaginable volition guide to ample reductions in final energy demand. Around 40%.
But this underestimates the possible energy funds for two reasons.
The archetypal is that it is according to final, not primary energy. Primary energy additionally includes warmth that is wasted in producing power in the archetypal place: lone about one-third of raw charcoal energy, and fractional of gas energy is converted to electricity. Eyre estimates that about 70% of chief energy is converted to final energy.3 If we were to move distant from charcoal and gas for electricity, the energy funds would be equal larger.
The second is that it assumes no another effectiveness measures are taken. But we cognize that there are many of options there – a figure of which could enhance individual wellbeing, cut bills, and decrease energy petition at the identical time. Improved insulation is a fine example.
Combine several of these measures alongside electrification, and energy petition could autumn a lot. This is a item that has been made many times before.
For a profound dive into distinct ways of measuring energy, and why electrification reduces demand, see the study “Beyond Primary Energy: The energy passage needs a new lens” by Kevin Pahud and colleagues.
“Electrification is efficiency”. Let’s rebuild our energy systems to obtain advantage of that.
