Strengthening Puerto Rico's Power Grid
“LUMA is committed to building a more reliable, more resilient, more customer-focused, and cleaner energy system for our 1.5 million customers. Through the implementation of EGRASS, our teams have one more tool to inform our deployment of resources to prioritize work in the most vulnerable areas of Puerto Rico and manage where we place our emergency response assets and teams so that they can be most effective in the event of an emergency,” said Aleksi Paaso, Vice President of LUMA for distribution, engineering, and investment strategy. “The people of Puerto Rico understand, better than most, the impact a hurricane has on the electric system. Preparing for emergency events like this is part of the important work we do every day and having this technology available bolsters our responsiveness and our efforts to build a resilient system.”
EGRASS helps emergency managers better characterize storm impacts by simulating historical storm paths for a variety of different wind intensity estimates. These exercises are helping LUMA Energy managers plan ahead to repair transmission lines, substations, and other components in Puerto Rico—keeping them safe from upcoming weather threats.
PNNL is participating in the unified DOE effort to rebuild Puerto Rico’s power grid and help it prepare for future hurricanes. The multiyear project includes complex work on grid modernization and planning for the future, including a transition to 100% renewables by 2050. “Puerto Rico is committed to transitioning to 100% renewables, so we are eager to help plan for that transition in a resilient and reliable way accounting for hurricane impacts on the system as it transitions. We would like to help identify how renewables and energy storage can be part of the solution, by designing their grid controls.” Marcelo Elizondo notes. Elizondo leads the PNNL team that provides grid resilience modeling and analysis on this project.
How EGRASS Helps Prepare for Hurricanes
EGRASS assesses the impact on infrastructure as a result of natural hazard events. It estimates the probability of failure for different components of the electrical infrastructure, such as towers, transmission lines and substations, and it analyzes the associated risk and impact of their failures on system reliability. It also aids in real-time recovery operations by providing expert judgment for determining alternative power sources for critical end-use loads.
“For the system reliability part, we already had a tool for that. It is called DCAT, the Dynamic Contingency Analysis tool,” Jeff Dagle, Chief Electrical Engineer at PNNL said. “We recognized a gap in our tools as we worked to rebuild the grid after the effects of Hurricane Maria. We wanted to add information like, ‘which power lines would go down’ to gain a better understanding of the fragility of the towers and their susceptibility to substations and to the individual components of the power system. EGRASS does that.” The team designed the model to understand which systems would fail based on certain assumptions about hurricane forces. “We gained an understanding of the impact of weather on the components of the power system to feed into our grid analysis,” Dagle added.
Supported by DOE’s Office of Electricity, and funded by LUMA, EGRASS helps protect and recover the current infrastructure by presenting intelligent modeling to best prepare for future hurricanes. Future plans include extending its applicability to other events, such as earthquakes and floods.
“DOE is committed to helping Puerto Rico strengthen the island’s resilience, and unlock its potential for reliable and affordable energy,” said DOE’s Acting Principal Deputy Assistant Secretary for the Office of Electricity Gil Bindewald. “By leveraging the expertise and cutting-edge capabilities of our national labs, we’re working to modernize Puerto Rico’s critical infrastructure and execute data-driven, community-tailored pathways toward 100% clean electricity.”
EGRASS is now available for use to serve coastal communities worldwide susceptible to hurricanes and other major storms.
