The Marina Coast Water District (MCWD) announced at a meeting of the Monterey County Board of Supervisors that it is going to restart its long-dormant desalination plant.
Remley Scherzinger, general manager for MCWD, told the supervisors that to augment their current water supply they’ll need to return to their already-built desal plant.
The desal facility was built in 1997 and was operated until 2003.
Earlier this month, the California Department of Water Resources announced a new round of funding for desalination projects in the state. Six million dollar grants will be made available for new projects that help expand the Golden State’s fresh water supply. The move comes on the heels of a new water initiative Governor Gavin Newsom has launched to address California’s historic drought.
Desalination is the process of removing salts and other minerals from ocean or brackish water, thereby making water safe to be consumed or used for agriculture or other needs. A 2019 study estimated there are just under 16,000 desalination plants in operation worldwide, spread across 177 countries. It’s a rapidly growing industry, with reverse osmosis technology in particular behind much of the capacity growth in recent years (see figure).
A permit approved Thursday by the California Coastal Commission will allow the Carlsbad desalination plant to modify its seawater intakes and discharge structures to better protect marine life and create a “stand-alone” system.
Poseidon Resources (Channelside) LP and the San Diego County Water Authority are temporarily reducing water production at the Claude “Bud” Lewis Carlsbad Desalination Plant to support statewide emergency energy conservation efforts during the extreme heat wave.
Poseidon Resources (Channelside) LP and the San Diego County Water Authority are temporarily reducing water production at the Claude “Bud” Lewis Carlsbad Desalination Plant to support statewide emergency energy conservation efforts during the extreme heat wave.
While the plant accounts for less than 1% of peak energy demand in San Diego Gas & Electric’s service territory, Channelside and the Water Authority are committed to supporting electrical reliability while ensuring continued delivery of safe and reliable water supplies. The partners reduced water production at the plant by about 20% for three days over the Labor day holiday weekend. Regular water deliveries were made from other sources. The reduced production helps decrease energy demand during the statewide emergency.
“The partnership by the Water Authority and Channelside is another reminder of the value our investments in cutting-edge technology and water supply reliability,” said Sandra L. Kerl, general manager of the Water Authority. “Desal plant operations are nimble, so production can be ramped up and down in response to local needs. This flexibility underscores the value of regional water supply planning, which allows us to activate solutions during challenging times.”
The Carlsbad Desalination Plant is the largest, most technologically advanced and energy-efficient desalination plant in the nation. The plant has produced more than 90 billion gallons of drinking water for San Diego County since operations began in December 2015. Starting Sunday, Sept. 4, the plant ramped down operations, making an additional 9 megawatts of power available for other uses.
The Water Authority is running its Lake Hodges Pumped Storage Facilities to generate 20 megawatts of on-demand power, helping meet peak demands. Photo: San Diego County Water Authority
The Water Authority also is running its Lake Hodges Pumped Storage Facilities to generate 20 megawatts of on-demand power, helping meet peak demands.
In addition, the Water Authority and the City of San Diego are collaboratively advancing the proposed San Vicente Energy Storage Facility in East County, one of the most promising pumped energy storage solutions in California. Pumped energy storage projects are designed to store excess renewable energy from solar and wind during the day, and then discharge that energy when energy use spikes or renewable energy is not available. As proposed, the project could store 4,000 megawatt-hours per day of energy (500 megawatts of capacity for eight hours), which is enough energy to provide approximately 135,000 homes with power.
The Claude “Bud” Lewis Carlsbad Desalination Plant uses energy recovery devices that save an estimated 146 million kilowatt-hours and reduce carbon emissions by 42,000 metric tons every year. Photo: San Diego County Water Authority
The Carlsbad Desalination Plant eliminates the need to transport water from Northern California to the San Diego region, offsetting approximately 190,000 megawatt-hours of electricity and 68,000 tons of carbon emissions each year. The plant also uses energy recovery devices that save an estimated 146 million kilowatt-hours and reduce carbon emissions by 42,000 metric tons every year.
“This is an example of how desalination plants can help contribute to energy reliability, in addition to water reliability, by taking appropriate action to increase the available energy capacity during the extreme heat event,” said Channelside President, Sachin Chawla. “We’re proud to do whatever we can to help our region address the current energy shortage.”
It’s a picture-perfect day in Southern California. The sun is beating down on this Carlsbad beach, where volleyballs hit the sand and surfers paddle out into the waves. Just steps from here, the salty water lapping the shore is being transformed.
This beach neighbors the largest desalination facility in the Western Hemisphere. The Carlsbad Desalination Plant uses a complex web of pipes, tanks and specialized filters to pull salt and impurities out of ocean water, turning it into part of the drinking supply for San Diego County.
Water managers are feeling the crunch of a supply-demand imbalance along the Colorado River. Fresh water reserves are shrinking as climate change squeezes the river that supplies 40 million people and fields of crops across seven states. Some have proposed desalination technology as a way to augment that supply, easing the strain on a river that supplies a growing population from Wyoming to Mexico. Experts say it could be part of the solution, but likely won’t make much of a dent in the region’s water crisis.
At the Carlsbad plant, former seawater poured into a cup from a freshwater spigot. Michelle Peters, technical and compliance manager for plant operator Poseidon Water, held it and took a drink.
“At 10 a.m, the morning surfers were swimming in it off the coast in the ocean here,” she said. “Now it’s high-quality drinking water, ready for consumption.”
California should invest tens of billions of dollars in water recycling, storage and desalination over the next two decades to shore up its supply as the state gets drier and hotter, Gov. Gavin Newsom said in a proposal released Thursday.
It comes as drought continues to grip the U.S. West and the state prepares to lose 10% of its water supply by 2040, according to projections by the Department of Water Resources.
It was the end of a fight that lasted for almost a decade. On 12 May 2022, the California Coastal Commission, which has a legal mandate to protect the coastline of the US state, voted to deny the building permit for a large seawater-desalination plant that was proposed to be erected near Huntington Beach. Ever since the application to build the plant was made in 2013, this mega-project has been dividing experts, politicians and activists.
Marin Municipal Water District officials, continuing their quest to boost supply, met this week for a detailed cost assessment on expanding reservoirs and connecting to new sources.
District staff stressed to the board that — unlike other options under review such as desalination and recycled water expansion that can produce a continual flow of water — enlarging reservoirs or building pipelines to outside suppliers does not guarantee water will be available when needed.
After a high profile, decades-long battle to build a desalination plant in Huntington Beach ended in denial, all eyes will be on the California Coastal Commission as it considers whether or not to approve two smaller desalination projects this fall.
