U.S. cities have been burning municipal solid waste since the 1880s. For the first century, it was a way to get rid of trash. Today advocates have rebranded it as an environmentally friendly energy source.
Most incinerators operating today use the heat from burning trash to produce steam that can generate electricity. These systems are sometimes referred to as “waste-to-energy” plants.
Communities and environmental groups have long opposed the siting of these facilities, arguing that they are serious polluters and undermine recycling. Now the industry is promoting a new process called co-incineration or co-firing. Operators burn waste alongside traditional fossil fuels like coal in facilities such as cement kilns, coal-fired power plants and industrial boilers.
I study environmental justice and zero-waste solutions and contributed to a recent report about the health and environmental impacts of co-incineration. Since that time, the Trump administration’s lenient approach to enforcing environmental laws against polluters – including incinerators – has deepened my concern. I’ve come to the conclusion that burning waste is an unjust and unsustainable strategy, and new attempts to package incineration as renewable energy are misguided.
U.S. municipal solid waste generation, 1960-2013. Image: USEPA.
Incineration industry capitalises on renewable energy
Classifying incineration as renewable energy creates new revenue streams for the industry because operators can take advantage of programs designed to promote clean power. More importantly, it gives them environmental credibility.
In 23 states and territories, waste incineration is included in renewable portfolio standards – rules that require utilities to produce specific fractions of their power from qualifying renewable fuels. The Obama administration’s Clean Power Plan – which the Trump administration has pledged to replace – allowed states to classify waste incineration and co-incineration as carbon-neutral forms of energy production.
Many environmental advocates in the United States and Europe are alarmed over government approval of increasingly diverse waste fuels, along with relaxed oversight of the incineration industry.
Although municipal solid waste combustion is regulated under the Clean Air Act, host communities are concerned about potential health impacts. Emissions typically associated with incineration include particulate matter, lead, mercury and dioxins.
Rally opposing a proposed waste-to-energy plant in Baltimore, Maryland, 18 December 2013. Image: United Workers/creative commons.
Now some companies are turning to co-incineration rather than building new plants. This move sidesteps substantial upfront costs and risky financial arrangements, which have created debt problems for host municipalities such as Harrisburg, Pennsylvania.
Co-incineration offers new markets for waste-derived fuels using existing infrastructure. It is hard to measure how many facilities are currently using co-incineration, since EPA’s Non-Hazardous Secondary Materials rule does not require them to report it. But as one data point, two affiliated building material companies, Systech and Geocycle, are co-processing waste in 22 cement kilns in the United States and Canada.
Co-incineration is not clean
As an example of concerns over co-incineration, consider the Hefty Energy Bag program, which is sponsored by Dow Chemical Company and promoted by the nonprofit group Keep America Beautiful. This project offers grants to municipalities to participate in a curbside pilot program that collects hard-to-recycle plastics for energy production.
Currently this initiative is collecting plastics in Omaha, Nebraska, and mostly co-incinerating them at the Sugar Creek cement kiln in Missouri. In 2010, the owner of this plant and 12 others settled with EPA for violating the Clean Air Act and other air pollution regulations, paying a $5m fine and agreeing to install new pollution controls. Although this is just one example, it indicates that concerns over air quality impacts from co-incineration are real.
Promotional video for the Hefty Energy Bag program.
Waste incineration deflects attention from more sustainable solutions, such as redesigning products for recyclability or eliminating toxic, hard-to-recycle plastics. Currently only about one-third of municipal solid waste is recycled in the United States. Rates for some types of plastics are even lower.
As the Trump administration reverses or abandons national and international policies to address climate change, many Americans are looking to local and state governments and the private sector to lead on this issue. Many cities and states are committing to ambitious zero-waste and renewable energy targets.
These policies can drive innovations in a greening economy, but they can also provide perverse incentives to greenwash and repackage old solutions in new ways. In my view, incineration is a false solution to climate change that diverts precious resources, time and attention from more systemic solutions, such as waste reduction and real renewable fuels like solar and wind. Whether it’s an incinerator, cement kiln or coal plant, if you put garbage into a system, you get garbage out.