S Energy Solutions and Gore Street Energy Storage Fund are partnering to deploy a 200 MW/400 MWh energy storage project in California, USA. The Big Rock project, to be located in Imperial County in Southern California, will provide resource adequacy and ancillary services to the CAISO market. Big Rock will use 137 AiON-ESS units, each with a power rating of 1.5 MW and the ability to store 3.5 MWh. Along with tier-1 lithium-ion batteries, the 137 containers include over 1,300 modular 140 kVA AiON-SIS string inverters.
The AiON-ESS containers can store energy for a two-hour duration. DC and AC components will be integrated inside each container and provide AC output ready to be fed into medium voltage transformers. Big Rock will be operated at 100 MW to supply 400 MWh and meet the four-hour discharge needs of an RA contract.
The site will be one of the largest energy storage projects in Imperial County and joins over 5.6 GW of energy storage serving CAISO, California’s grid operator.
LS Energy Solutions is a provider of grid-connected energy storage solutions. The Charlotte, North Carolina based company said this project will be its largest installation yet.
In addition to supplying AiON-ESS containers, the company expects to provide commissioning support and operational services at Big Rock, including extended warranty, preventative maintenance, capacity maintenance and system remote monitoring for the life of the project.
UK developer Gore Street Energy Storage Fund acquired the Big Rock site in February 2023 from Avantus, which will continue to provide administrative and development services for the installation. Gore Street Energy Storage Fund already has energy storage investments in Texas, Ireland, Great Britain and Germany. Construction at Big Rock will begin soon, with the project expected to come online in the second half of 2024.
In March last year LS Energy Solutions has delivered its first all-in-one AiON Energy Storage System (AiON-ESS) to V20 Energy, a New Jersey-based storage project developer.
The company’s latest product launched in late 2021, AiON-ESS is a flexible, modular AC energy storage solution available in two models for 1-hour and 2- to 4-hour applications. The AiON-ESS offers a variety of configurations to address a range of power and energy use cases, from one-megawatt to multi-hundred-megawatt utility-scale applications.
 The configuration for V20 Energy is the AiON-ESS Power Series, which includes Tier-1 lithium-ion batteries combined with LS-ES’s string inverter platform in a single, scalable, modular format. Its all-in-one design and AC output facilitate ease of installation, operation and maintenance. To ensure compliance with the highest safety standards, the Power Series has received a UL9540 certification.
 As part of the PJM Interconnection, the world’s largest wholesale electricity market, the project will contribute to its expanding energy storage portfolio and will enable V20 Energy to participate in the PJM ancillary services markets.
 “We were thrilled to provide our latest, newly certified all-in-one AiON-ESS storage system to V20 for this 2022 project,” said Steve Fludder, CEO of LS Energy Solutions. “Our design incorporates features which reduce on-site work and material by incorporating these functions in a stable and repeatable factory environment. We are leading a transition from executing bespoke projects to delivering standardized products.”
 Paul Matinho, who leads V20 Energy said,
“The LS Energy Solutions team was great to work with on our first major energy storage project in 2022. We value the relationship, their industry experience, and the ability to creatively solve a couple of first project challenges together. We look forward to announcing our next storage project with LS Energy Solutions’ AiON-ESS very soon.”
 AiON-ESS systems have passed the rigorous UL9540 approval process, including a multi-point performance test, to meet the highest safety standards for energy storage products. In addition, the certification verifies that all 76 key components in the system are of high quality and UL-approved. Risk is minimized and costly redesigns are avoided by identifying design issues early, as well as ensuring product conformity to meet international regulatory standards.
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