Environmental

The Claude “Bud” Lewis Carlsbad Desalination Plant is located along the Carlsbad coastline, and adjacent to one of North County San Diego’s most precious natural resources - the Agua Hedionda Lagoon.

The Agua Hedionda Lagoon is a 400-acre man-made, shallow coastal embayment teeming with marine life. The lagoon hosts four main habitats; the Marshlands, where the saltwater lagoon meets with freshwater creeks; the Upland Plant Communities; the Intertidal Mudflats, which are location along edges of the lagoon; and the Subtidal habitat, which is primarily underwater. Each of these habitats support a thriving ecosystem, which includes 70 species of fish, 20 species of amphibians and reptiles, 24 species of mammals, 192 species of birds, 175 species of invertebrates and 100 species of plants.

The lagoon is also home to an array of recreational and educational activities, and environmental research. The lagoon supports a thriving marine ecosystem and is home to the Hubbs-SeaWorld fish hatchery, the Carlsbad Aquafarm, YMCA Camp and the Lagoon Foundation's Discovery Center.

To learn more about the Agua Hedionda Lagoon, visit the Agua Hedionda Lagoon Foundation’s website at www.lagoon.aguahedionda.org.

Mitigation

The Otay River Estuary Restoration Project (ORERP) is a partnership between the U.S. Fish and Wildlife Service (USFWS or Service) and Poseidon Resources (Poseidon) to create, restore, and enhance coastal wetlands to benefit native fish, wildlife, and plant species, and to provide habitat for migratory seabirds and shorebirds and salt marsh–dependent species within the South San Diego Bay Unit of the San Diego Bay National Wildlife Refuge (San Diego Bay NWR).

The ORERP implements the habitat restoration objectives of the San Diego Bay NWR Comprehensive Conservation Plan (CCP) (USFWS 2006), and fulfills the applicable terms and conditions of the permits issued to Poseidon by the California Coastal Commission (Commission) and San Diego Regional Water Quality Control Board (Regional Board) for the Carlsbad Desalination Project. The partnership between the Service and Poseidon provides public benefits by restoring coastal wetlands and wildlife habitats within the San Diego Bay NWR, and allows Poseidon to meet its mitigation requirements for the Carlsbad Desalination Project.

The ORERP proposes to restore approximately 125 acres ofcoastal wetlands and associated uplands at two locations on the San Diego BayNational Wildlife Refuge (San Diego County, California), including a 33.5-acreportion of the Otay River floodplain, and a 91-acre active solar salt pond(Pond 15). To achieve elevations appropriate for supporting subtidal andintertidal wetlands within the Otay River Floodplain Site, the actionalternatives propose the excavation of 320,000 to 370,000 cubic yards ofmaterial or which 260,000 to 310,000 cubic yards would transported to the Pond15 Site to be beneficially used to restore coastal wetlands within the pond.The remaining 30,000 to 40,000 cubic yards of material would be stockpiled onthe Refuge for future beneficial use.

You can view the Draft Environmental Impact Study (DEIS) for the proposed project HERE.


Energy Efficiency

Seawater desalination has long been used in regions all over the world where fresh water is in short supply. Today, there are more than 15,000 desalination plants worldwide in 150 countries, producing more than 18 billion gallons of fresh drinking water per day. An estimated 70 million people around the world rely on desalinated water for their daily water needs.

Recent advancements in reverse osmosis desalination technology make this method of securing fresh drinking water increasingly cost effective and, therefore, an even more viable option for ensuring water supply reliability. Coupled with other improvements in desalination technology, these advances have resulted in reduced energy consumption and lower operating costs. This technology is being used at the Carlsbad Desalination Plant to make it the most energy-efficient desalination plant in the nation.

The Carlsbad Desalination Plant utilizes state-of-the-art pressure exchanger devices made by Energy Recovery, Inc. Because the device consumes no electricity and recycles otherwise lost energy, much like a hybrid car, the overall energy consumption of the reverse osmosis process is reduced by nearly 46 percent.

This technology allows the desalination plant to save an estimated 146 million kilowatt-hours of energy per year, the equivalent of $12 million per year. As a result, they reduce carbon emissions by 42,000 metric tons annually – roughly equivalent to the annual greenhouse gas emissions from 9,000 passenger vehicles – by recycling the pressure from the reverse osmosis process.