The Florida Department of Health in Duval County has issued a health warning after detecting red tide — a harmful algal bloom — near Fort George Inlet, reigniting scrutiny of Jacksonville’s coal-fired power plants as a contributing nutrient source. Environmental advocates and researchers argue that nitrogen and phosphorus discharges from the city’s coal facilities, particularly JEA’s Northside Generating Station, exacerbate the blooms that devastate marine ecosystems, threaten fisheries, and pose respiratory risks to coastal communities. This latest outbreak underscores a growing body of evidence linking thermal pollution and nutrient loading from fossil fuel infrastructure to worsening harmful algal events across Florida’s waterways.
The connection between coal combustion and coastal eutrophication extends beyond carbon emissions. Coal-fired plants require massive water withdrawals for cooling, returning heated water to receiving bodies — a thermal stressor that accelerates algal metabolism and extends bloom seasons. Simultaneously, stack emissions deposit nitrogen oxides onto watersheds, while coal ash ponds and wastewater streams can leach phosphorus and trace metals into groundwater and surface water. JEA’s Northside plant, situated on the St. Johns River, has long drawn criticism for its once-through cooling system and discharge permit limits that environmental groups argue are insufficient to protect the river’s impaired status.
Florida’s energy landscape is at an inflection point. The state remains heavily reliant on natural gas, but coal still accounts for a meaningful share of generation, and utilities face mounting pressure to retire aging units. JEA has committed to phasing out coal at Northside by 2030, replacing capacity with solar, battery storage, and gas — yet the timeline leaves nearly a decade of continued nutrient and thermal loading. Meanwhile, the Florida Department of Environmental Protection is updating basin management action plans for the St. Johns, and the EPA’s revised effluent limitation guidelines for steam electric plants could impose stricter controls on wastewater discharges if finalized.
The red tide at Fort George Inlet is not an isolated event but a symptom of a systemic failure to account for the full environmental externalities of thermal generation. As Florida’s population grows and climate change intensifies rainfall and runoff, the compounding stressors on estuarine systems will only increase. Invest