Fossil fuel-based power generation remains a cornerstone of energy production in the United States, but it comes with a complex web of environmental challenges. From fuel storage to coal combustion residuals (CCR) management, utilities face increasing regulatory scrutiny and operational risks that demand proactive strategies.

Fuel Oil Storage and Spill Response

Fuel oil storage tanks are essential for plant operations, yet they pose significant environmental risks. Leaks from aboveground storage tanks (ASTs) can lead to soil contamination and regulatory reporting obligations. In one case, fuel oil leaked from a multi-million-gallon AST, requiring immediate containment with sorbent materials and a comprehensive site evaluation. Closure was achieved through soil remediation and confirmation that downgradient media to include groundwater was not impacted.

What is Coal and Why It Matters

Coal is a fossil fuel formed from compressed organic plant material over millions of years. It is primarily composed of carbon, with smaller amounts of hydrogen, oxygen, nitrogen, sulfur, and trace metals. The energy in coal comes from carbon and hydrocarbons, which release heat when burned. This combustion process produces carbon dioxide (CO₂), water vapor, and coal combustion residuals such as fly ash, bottom ash, and boiler slag. Understanding coal’s composition and byproducts is essential for managing environmental impacts and complying with evolving regulations.

Emergency response capabilities are equally critical. A recent oil sheen discovered in a plant’s coolant water canal triggered deployment of sorbent pads and boom arrays to prevent longer term impacts of nearby waterways. Corrective actions included evaluating the released material in the waterway to ensure that no sensitive receptors were impacted, repairing a leaking cast iron pipe using epoxy and carbon fiber composite wraps, removal of the sheen with sorbent materials until no longer needed, and ensuring compliance with applicable regulatory standards.

The Kingston Fossil Plant Spill: A Turning Point

In December 2008, the Kingston Fossil Plant in Tennessee experienced the largest coal ash spill in U.S. history. Approximately 1.1 billion gallons of coal ash slurry broke through a dike, flooding over 300 acres of land, destroying homes, and contaminating rivers and streams. The spill highlighted the catastrophic risks associated with unlined and poorly managed ash ponds, as coal ash contains heavy metals such as arsenic, mercury, and lead that pose serious threats to human health and the environment.

The cleanup took years and cost over $1 billion, while sparking lawsuits and regulatory reforms. This event was the catalyst for the 2015 U.S. EPA CCR Rule, which introduced stringent requirements for monitoring, containment, and closure of coal ash impoundments to prevent similar failures in the future.

Coal Combustion Residuals: An Evolving Regulatory Landscape

Coal-fired plants generate CCRs such as fly ash, bottom ash, and boiler slag—byproducts that require careful long-term management and evaluation of potential impacts from these features to the local sensitive receptors. The 2015 CCR Rule mandated groundwater monitoring, corrective actions, and lined impoundments to protect drinking water resources. However, the regulatory framework continues to evolve. The 2024 Legacy CCR Rule extended compliance obligations to inactive impoundments at inactive utilities, creating new challenges for facilities that previously considered these units exempt. Upcoming deadlines for Facility Evaluation Reports and groundwater monitoring compliance add further complexity, especially amid contractor shortages and budget constraints.

Operational and Technical Challenges

Implementing CCR compliance programs involves overcoming significant hurdles:

• Installing monitoring systems in areas with dense utility infrastructure.
• Conducting subsurface investigations within ash ponds while ensuring that the ground surface is stable for drilling equipment/personnel.
• Managing large well networks and maintaining well integrity in flood-prone areas.
• Performing aquifer investigations as needed with barges or offshore platforms when impacts extend beneath water bodies.

These tasks require meticulous planning, advanced drilling techniques, and coordination across multiple stakeholders.

Looking Ahead

As environmental regulations tighten and legacy issues resurface, power generation facilities must adopt innovative solutions to remain compliant and minimize risk. Whether through emergency spill response, groundwater monitoring, or corrective action strategies, the industry’s commitment to environmental stewardship is more critical than ever.