The PREPA Coto Laurel – BESS is a 5,500kW energy storage project located in Coto Laurel, Ponce, Puerto Rico.

The electro-chemical battery energy storage project uses lithium-ion as its storage technology. The project was announced in 2016.


The PREPA Coto Laurel – BESS is being developed by Windmar Renewable Energy. The project is owned by Puerto Rico Electric Power Authority (100%).

The key applications of the project are ramp-rate control, frequency regulation and grid balancing services.

Contractors involved

Puerto Rico Electric Power Authority is the owner. Windmar Renewable Energy is the developer. Saft Groupe is the technology provider for the project.

Saft Groupe is the system integrator.

Additional information

PREPA will install a large-scale battery park at the Coto Laurel 10 MW PV farm, to help integrate the farm’s output and other renewables. Local developer Windmar will install the batteries, supplied by Saft. PREPA, which is still in ongoing restructuring efforts over a reported US$8 billion debt, needs to get 20% of its electricity from renewable sources by 2035 to meet a government-mandated Renewable Portfolio Standard (RPS). Lithium-ion batteries from Saft’s Intensium Max 3.0 range will be used on the project, housed in 20ft containers. They will provide ramp-rate control and frequency regulation – both grid-balancing services – helping integrate variability from renewables and able to replace the ‘must-run’ use of thermal generation to maintain grid frequency. Saft, world leader in design and manufacture of advanced technology batteries for industry, has won a contract to supply Windmar three containers of Lithium-Ion Max 20P Intensium intended to control ramp and frequency response.


All publicly-announced energy storage projects included in this analysis are drawn from GlobalData’s Power IC. The information regarding the projects are sourced through secondary information sources such as country specific power players, company news and reports, statistical organisations, regulatory body, government planning reports and their publications and is further validated through primary from various stakeholders such as power utility companies, consultants, energy associations of respective countries, government bodies and professionals from leading players in the power sector.