When Fire Impacts Solar Energy Farms

A photovoltaic (PV) energy system may be composed of ground- or roof-mounted solar panels, connected cables, transformers, electrical boxes, and batteries. While known for their environmental benefits as a source of renewable energy, the systems can pose a serious threat to firefighter safety when they fall in the path of wildland fires.

Electrical Hazard

As a general rule, apply powerline safety precautions to PV systems. All PV system components encountered in the fire ground should be considered “hot” and conducting live current. Electricity in significant voltages (like in PV systems) from any source can be lethal.

Solar panels and battery electric storage are an independent (off-grid) power source. Even when grid-powered electricity has been shut off to an area, the PV system will still be generating power. When the sun is shining, panels produce high voltage electricity, and panels may retain residual current even after days without sun. Additionally, any battery energy storage systems connected to the solar array will always hold electrical current day and night, regardless of grid power.

Smoke and Hazardous Materials

Treat PV systems with the same rules of suppression engagement for your agency as structures. When these systems catch fire, they release numerous toxic chemicals. Once airborne in smoke, the chemicals pose a serious threat to responders after even short-duration exposure. If you discover a burning PV system or suspect fire impact to PV components is imminent, notify all resources in the area and notify command. Ensure no personnel are downwind and maintain and establish safe distances to reduce smoke exposure in the event of changes in wind direction.

Summary

The dangers of PV systems in wildland fires are significant and should not be underestimated. The release of toxic chemicals, the risk of electric shock, and the continuous production of electricity pose serious challenges for emergency responders. Understanding these risks and implementing appropriate safety measures are crucial to minimizing the potential hazards associated with PV systems in fire situations.

Discussion Questions:

• Have you encountered PV systems on wildfires? What was your course of action?
• Often, we have plans for how to engage fire threatening our local communities, but do you know where any large, grid-scale PV systems are located on your local unit? Is there a suppression plan in place? Look at a map of your area and discuss.
  • How would you engage fire there? Discuss considerations like surrounding fuels, access, seasonal winds, etc.
• How would you identify and communicate the presence of PV systems when working in the urban interface? Discuss your crew’s approach.