Wood pellets have become a major fuel source for modern biomass power stations. Global demand has surged as coal-fired plants are retrofitted to burn compressed wood pellets instead. While wood is a renewable resource, sourcing it on a mass scale can be highly problematic. The Deep South of the United States has become the primary global exporter of wood pellets, shipping millions of tonnes across the Atlantic to Europe. This massive supply chain has led to worries about intense logging of biodiverse wetland forests.
The most significant debate surrounding biomass energy is its true environmental impact. Critics argue that burning wood pellets emits more carbon dioxide per megawatt-hour than burning coal at the point of combustion. Furthermore, harvesting entire trees destroys local ecosystems and releases stored soil carbon, creating a "carbon debt" that takes many decades for replacement forests to re-absorb. Local communities situated near pellet processing plants also suffer from high levels of wood dust and noise pollution, which have been linked to respiratory illnesses and reduced quality of life.
Despite these concerns, development continues. Biomass energy is heavily supported by government subsidies. In the UK, major power generation firms have received billions of pounds in green subsidies to convert their generators from coal to biomass. Supporters argue that biomass provides essential, reliable, dispatchable baseload power that can be turned on or off instantly—unlike wind and solar power, which fluctuate depending on the weather.
While some European nations, pressured by environmental scientists, have begun to reconsider their subsidy regimes for biomass, others still view it as a vital transition fuel. Without biomass, many countries argue they cannot meet their legally binding targets to phase out coal by the end of the decade. Hence, the debate persists over whether this energy source is genuinely green, or simply a subsidized polluter.
Using the concept of external costs, evaluate whether biomass energy is under-provided or over-provided in the energy market. Use an appropriate diagram in your answer.
