Up to Six Explosions a Day: ESA Demands Retail Ban on Nitrous Oxide Cylinders

Individual energy-from-waste plants in the UK are suffering up to six significant nitrous oxide cylinder explosions every day, according to operator data released by the Environmental Services Association (ESA).

The figure anchors a letter the ESA has sent to the Home Secretary urging a ban on the retail sale of nitrous oxide canisters. The trade body reports that its members have recorded an increase in medium-sized pressurised cylinders discarded with general waste and recycling — despite nitrous oxide being classified as a Class C drug in 2023.

That classification, evidently, has not solved the disposal problem. The ESA says larger cylinders are still turning up in the waste stream, and it has recorded a rise in recreational users discarding "intermediate-sized" pressurised cylinders. These, the ESA claims, have no legitimate consumer use, yet remain readily available online.

Why cylinders threaten EfW plants?

The ESA describes the canisters as "ticking time bombs". Pressurised nitrous oxide cylinders can explode if damaged or exposed to heat — and heat is the operating principle of an energy-from-waste facility.

Around 60 EfW plants are operational in the UK. Together they treat thousands of tonnes of Britain's rubbish each week, mostly on behalf of local authorities, combusting it as fuel to generate energy. A pressurised cylinder entering that combustion stream is not a marginal hazard; it is a routine one.

The sector can now price that routine. Single incidents have caused damage exceeding £2 million. Earlier this year, Veolia revealed that nitrous oxide canisters had caused more than £4.7 million in damage to its UK EfW facilities since 2023.

Beyond the balance sheet, the explosions place staff at risk. That combination — worker safety and infrastructure damage — is what has pushed the ESA from industry complaint to formal lobbying.

What is the sector asking government to do?

The ESA is calling on the UK Government to follow the lead of the European Union and ban the sale of intermediate-size nitrous oxide cylinders on the UK retail market. The proposed ban would carve out legitimate and specialist uses.

The letter is not a lone trade-body effort. It is co-signed by:

• The Chartered Institution of Wastes Management (CIWM)
• The National Association of Waste Disposal Officers (NAWDO)
• The Association of Directors of Environment, Economy, Planning & Transport (ADEPT)

That coalition spans the professional body, the disposal officers who commission treatment capacity, and the local government directors who hold the waste contracts. In plain terms: the entire chain that handles Britain's residual waste is asking for the same intervention.

Dan Cooke, Director of Policy, Communications and External Affairs at CIWM, said: "The evidence of the damage to infrastructure and the risk to recycling and waste professionals' safety from nitrous oxide cylinders in the waste stream is clear, as is the case for government to act."

He added: "There's a simple solution: Ban them for all but legitimate and specialist use. Protect our workers and our vital infrastructure."

A 2023 law that changed too little?

The story carries an awkward precedent. The 2023 Class C classification was meant to curb recreational nitrous oxide use. Two years on, the ESA's members are recording more — not fewer — cylinders in the waste stream, including intermediate sizes that the sector says have no defensible consumer purpose.

The economics are now doing the arguing that classification alone could not. At £4.7 million of damage across one operator's portfolio since 2023, and single incidents breaching £2 million, the cost of inaction lands on EfW operators and, ultimately, on the local authority contracts they serve.

The next move sits with the Home Office. Whether the government matches the EU's retail ban, or leaves the sector to absorb the explosions, will decide whether those six-a-day figures fall or become the sector's operating baseline.