Waste-to-Energy

Energy

Waste-to-Energy

Burning rubbish to make electricity. Better than a landfill, worse than not making the rubbish, and it creates an appetite for waste that is very hard to switch off.

🌱Seasons

The effect compounds within years. Put it in place and it keeps working.

Origins

The first municipal waste incinerator was built in Nottingham in 1874 and was called, magnificently, a “destructor.” It burned the town’s rubbish and generated electricity, and the Victorians thought it was tremendous, and in a certain light they were right.

Cities have always had a waste problem and it has always been the same problem: there is a great deal of it, it smells, it attracts rats, and it has to go somewhere. For most of history that somewhere was a hole in the ground or a river, and both were worse than they sound.

Modern waste-to-energy is the descendant of the destructor, and its home is northern Europe. Denmark, Sweden and the Netherlands burn a large share of their municipal waste, generate electricity and district heating from it, and have very little landfill. Copenhagen’s incinerator has a ski slope on the roof, which is either the most charming piece of infrastructure in Europe or a very effective piece of public relations, depending on how cynical you are feeling.

And then Sweden ran out of rubbish, and started importing it from other countries to keep the plants running.

That fact contains the entire critique. A waste-to-energy plant is a large capital asset with a thirty-year life, and it needs to be fed. Once you have built it, you have created an institutional appetite for waste, and a city with a hungry incinerator has a quiet, structural reason not to try too hard at recycling.

What it actually is

Waste-to-energy burns municipal solid waste at high temperature and uses the heat to generate electricity and, in the best systems, district heating.

The genuine case for it. The alternative for most of the world is landfill, and landfill is genuinely awful. Organic matter buried in an anaerobic hole produces methane, roughly 80 times more potent than CO₂ over twenty years. Landfills leach into groundwater. They take land. Burning the waste, with proper emissions control, avoids the methane, recovers energy, and reduces volume by around 90%. Compared with a badly managed landfill — which is what most of the world actually has — it is a clear improvement.

The genuine case against it. Burning waste emits CO₂, and a large share of municipal waste is plastic, which is fossil carbon. Burning plastic is, in carbon terms, essentially burning oil with extra steps. Waste-to-energy plants are frequently more carbon-intensive per unit of electricity than the grid they feed, and getting worse as that grid cleans up.

And the structural problem, which is the real one. The plant is a thirty-year asset with a contractual need for a minimum tonnage. That contract makes waste an input rather than a problem, and it sits in permanent tension with reduction, reuse and recycling — all of which are better and all of which starve the incinerator.

Sweden importing rubbish is not an anomaly. It is what the incentive structure produces.

The numbers

Against landfill. Landfilled organic waste produces methane, and rotting food in landfill contributes up to 14% of global methane emissions. Burning waste avoids that methane and reduces volume by roughly 90%. Against an unlined, unmanaged dump — which is the reality across much of the world — incineration is a substantial improvement.

Against a clean grid. Waste-to-energy is frequently more carbon-intensive per kilowatt-hour than the electricity grid it supplies, and the gap widens every year as grids decarbonise. A technology that looked clean against coal looks dirty against wind.

The plastic problem. A large share of municipal waste is plastic, which is fossil carbon. Burning it is functionally burning oil, and it is counted as waste treatment rather than as fossil fuel combustion, which is another accounting convenience.

The lock-in. Plants are thirty-year assets with minimum-tonnage contracts. Cities that build them acquire a structural interest in generating waste, and recycling rates in some incinerator-heavy jurisdictions have stalled or fallen.

The hierarchy, which is not controversial. Reduce, then reuse, then recycle, then recover energy, then landfill. Waste-to-energy sits fourth. It is better than the fifth option and worse than the first three, and it should be argued for on exactly those terms.

Why it matters

The rubbish has to go somewhere, and every option is bad, and this page is about choosing between bad options honestly.

We are not going to pretend that landfill is fine. It is not. In much of the world it is an open dump where children pick through medical waste, and it leaks methane into the sky and poison into the groundwater, and burning that material properly would be an unambiguous improvement in those people’s lives.

But we are also not going to pretend that a ski slope on an incinerator solves anything fundamental.

The uncomfortable truth underneath all of this is that we are producing an extraordinary quantity of things that nobody wants for very long, and every technology on this page is a way of dealing with the consequence rather than the cause. The incinerator, the landfill, the recycling plant — all of them are downstream of a decision made in a design studio and a marketing meeting about how long something should last.

Your great-grandmother produced almost no waste. Not because she was virtuous but because everything she owned was worth keeping, and repairing, and passing on. The jar had a second life. The coat was turned. The bones went into stock.

We built a system that made things too cheap to keep, and then we built enormous machines to burn the consequences, and we put a ski slope on top so that we would feel better about it.

It is better than a dump. It is not an answer.

What it actually takes

Not building it before you have tried the first three steps. Reduce, reuse, recycle. A city that builds an incinerator before it has a serious recycling and food-waste programme has locked in its waste stream for thirty years and will spend those thirty years defending it.

Contract design that does not require feeding it. Minimum-tonnage clauses are the mechanism by which incinerators strangle recycling. They are also standard, because they are how the plant gets financed. This is a genuinely hard problem and it is rarely confronted.

Getting the plastic out first. Burning plastic is burning oil. Separating it — and, better, not producing it — changes both the carbon arithmetic and the toxicity.

Emissions control that is real and monitored. Modern plants with proper scrubbers are genuinely far cleaner than the incinerators of the 1970s, which earned the technology its reputation. Old or poorly regulated plants emit dioxins and heavy metals, and communities near them — almost always poorer communities — have every reason to be suspicious.

And honesty about where it sits. Fourth in the hierarchy. Better than a dump. Worse than not making the rubbish. Anyone presenting it as a renewable energy source is overselling, and the word “renewable” on a rubbish incinerator does real damage to public trust.

Where it matters most

Denmark, Sweden and the Netherlands have the most developed waste-to-energy systems in the world, integrated with district heating, and they are also where the lock-in problem is clearest — Sweden importing rubbish to feed its plants is the emblematic fact of this entire technology.

Japan incinerates a very large share of its waste, out of straightforward land scarcity, and does it about as well as it can be done.

Rapidly urbanising Asia and Africa are where the decision is being made right now, and where the alternative is frequently an open dump rather than a sanitary landfill. In that comparison, incineration with proper controls is a real improvement in public health — and building organics separation and recycling first is a far better one.

The American Gulf Coast and industrial corridors are where the environmental justice dimension is sharpest. Incinerators, like most polluting infrastructure, are consistently sited near poorer communities, and their objections are neither irrational nor new.

How to tell it’s being done well

Has the city tried reduce, reuse and recycle first? An incinerator built before a serious recycling programme locks in the waste stream for thirty years.

Is there a minimum-tonnage contract? This is the mechanism by which incinerators kill recycling, and it is usually buried in the financing.

Is the plastic being separated? Burning plastic is burning oil. Everything about the carbon arithmetic depends on this.

Who lives next to it? Almost always the poorest people in the city. Their objections deserve better than to be dismissed as NIMBYism, because the historical record on incinerator emissions is not good.

Is it being called renewable? If so, be sceptical. That word on a rubbish incinerator is a marketing decision, not a scientific one.

What you can do

Anyone

  • Waste-to-energy sits fourth in the hierarchy: after reduce, reuse and recycle, and before landfill. It is better than a dump and worse than not making the rubbish, and it should be argued for on exactly those terms.
  • Sweden ran out of rubbish and started importing it to feed its incinerators. That single fact contains the entire critique.

Communities

  • If an incinerator is proposed near you, ask about the minimum-tonnage contract. That clause determines whether your city will ever take recycling seriously.
  • Incinerators are consistently sited near poorer communities. That pattern is old, well documented, and not a coincidence.

Policymakers

  • Do not build one before you have a serious recycling and food-waste programme. You will spend thirty years defending the asset instead of reducing the waste.
  • Separate the plastic. Burning it is burning oil, and it dominates the carbon arithmetic.
  • Stop calling it renewable. It is waste treatment with energy recovery, and mislabelling it corrodes public trust in everything else you say.

Business and investors

  • Waste-to-energy is becoming more carbon-intensive relative to a decarbonising grid every year. A plant that looked clean against coal looks dirty against wind, and the asset life is thirty years.
  • The regulatory and reputational risk is rising, not falling.

Who is working on this

We are researching which organizations in our directory of 8,493 actively work on this solution, and we only list an organization once we have verified it. That research is ongoing. In the meantime, search the directory yourself:

Search the directory for “Waste-to-Energy” →

Questions

Is burning rubbish better than landfilling it?

Generally yes, particularly against an unlined or unmanaged dump, which is what much of the world actually has. Organic waste in a landfill produces methane, roughly 80 times more potent than CO2 over twenty years, and rotting food in landfill contributes up to 14% of global methane emissions. Incineration avoids that and reduces volume by about 90%.

So why is it controversial?

Because burning waste emits CO2, and a large share of municipal waste is plastic, which is fossil carbon. Burning plastic is essentially burning oil with extra steps. Waste-to-energy plants are frequently more carbon-intensive per unit of electricity than the grid they supply, and that gap widens every year as grids clean up.

What is the lock-in problem?

An incinerator is a thirty-year asset with a contractual need for a minimum tonnage of waste. That contract turns rubbish into an input rather than a problem, and it sits in permanent tension with reducing, reusing and recycling, all of which starve the plant. Sweden ran out of rubbish and began importing it to keep its incinerators running.

Where does it sit in the waste hierarchy?

Fourth. Reduce, then reuse, then recycle, then recover energy, then landfill. It is better than the fifth option and worse than the first three, and it should be argued for on those terms rather than presented as a renewable energy source.

Are modern incinerators safe?

Modern plants with proper scrubbers are dramatically cleaner than the incinerators of the 1970s that earned the technology its reputation. Old or poorly regulated plants emit dioxins and heavy metals. And they are consistently sited near poorer communities, which is a pattern old enough and well documented enough that local objections deserve better than to be dismissed.

Should developing cities build them?

It depends what they are replacing. Against an open dump where people pick through waste and methane leaks freely, a well-controlled incinerator is a genuine public health improvement. But building organics separation and recycling first is better still, and far cheaper, and it does not lock the city into feeding a furnace for thirty years.

Sources

The solution taxonomy follows the framework popularised by Project Drawdown. The analysis above is our own; for their carbon modeling and rankings, visit them directly.