New Jersey water treatment plant now prepped with on-site solar-plus-storage microgrid

EOS energy storage

A 250-kW, 1 MWh Eos Aurora DC battery system was commissioned at the wastewater treatment plant in the Borough of Caldwell, NJ. The batteries are a central component of Public Service Electric and Gas Company’s (PSE&G’s) on-site solar-plus-storage microgrid that will help keep the facility operating during extended power outages. The Caldwell microgrid is part of the New Jersey utility’s Solar 4 All program.

The microgrid includes an Eos Energy Storage system and an 896 kW-DC solar PV system designed and installed by Advanced Solar Products of Flemington, NJ. Siemens Energy Management integrated the Eos Aurora system, solar facility, and existing diesel generator, using the Eos Znyth battery technology as the backbone of the microgrid to reinforce emergency resiliency for this piece of critical municipal infrastructure. Siemens also provided the intelligent control technology to monitor, manage and distribute power across the system.

The solar and battery storage systems are connected directly to PSE&G’s electric grid. Under normal conditions, the solar panels deliver power to the grid and the battery storage system can provide value-added grid services for integrating solar onto the grid and participating in ancillary markets.

The Caldwell wastewater treatment plant microgrid is part of a 3 MW-DC portion of the Solar 4 All program. The initiative develops projects that integrate solar with other technologies to reduce the impact of solar on the grid or to demonstrate reliability and grid resiliency of solar for critical facilities during prolonged power outages. The solar installation, combined with Eos’ long-duration energy storage, significantly extends backup power capacity and emergency operation of critical water treatment capabilities.

EOS energy storage

“One of the goals of our Solar 4 All program is to help support the growth and development of solar and related industries in New Jersey,” said Todd Hranicka, director – solar energy at PSE&G. “So we were especially happy to include the battery technology from a fellow New Jersey company like Eos into a project that helps make our electric system and a piece of critical infrastructure more reliable and resilient.”

Construction of the solar-plus-storage system at the Caldwell wastewater treatment plant was a joint effort between Advanced Solar Products, Eos, and Siemens Energy Management. The Eos Aurora battery system was selected on the basis of its multi-hour duration and the benefits of its simple, sustainable and inherently stable zinc hybrid cathode design.

— Solar Builder magazine

Eos Aurora DC Battery System under new, lower pricing model

Eos Energy Storage is moving its Eos Aurora DC Battery System to a forward-pricing model. The company is taking orders today for volume purchases at a price of $160 per usable kWh for shipment in 2017 and $95 per usable kWh for shipment in 2022.


Eos says it is the first company to accept orders below $100 per usable kWh for a complete DC battery system, including battery modules, battery management system and outdoor-rated enclosure. Eos’ price-cap guarantee ensures that future purchases will receive the lower of the contracted price or any future price for an equivalent volume purchased the same year. The company is also offering up to 20-year performance guarantees at additional cost to optimize capacity under a wide range of applications and use cases.

“These price points correspond to a levelized cost of energy of approximately $50-60 per MWh for storage, roughly 30 percent lower than the lowest projected cost for any competing storage system,” says Jim Hughes, Eos Chairman of the Board. “With these economics, Eos will become the default solution for new peaking capacity and will enable a dispatchable renewable energy product that outcompetes conventional power generation.”

RELATED: How to make solar+storage accessible for low-income communities 

System details

Built on standardized 250 kW/1 MWh DC building blocks, the Eos Aurora is a best-fit utility-grade solution for multi-hour, high-throughput applications such as locational capacity, peak shaving and renewable integration. The Eos Aurora integrates the company’s proprietary zinc hybrid cathode Znyth battery into an outdoor-rated, plug-and-play Energy Stack which enables rapid installation and reduces cost throughout the project lifecycle.

As a DC system supplier, Eos partners with major integrators through its Aegis program to deliver and install turnkey energy storage solutions. Aegis partners provide power conversion and controls, grid connection, and installation services as well as maintenance and warranty administration over the life of the project. Eos recently announced partnerships with Siemens and Northern Power Systems to deliver fully-integrated energy storage solutions, and is building out its Aegis program to offer and support deployments in markets around the world.

The Eos Aurora has no moving parts and employs widely available materials and highly commoditized manufacturing equipment and processes.

— Solar Builder magazine

Eos Energy Solutions To Develop Next-Gen Storage Solution With NEC ES

eosNEC Energy Solutions, a subsidiary of NEC Corp., announced today that it has entered into an agreement with Eos Energy Storage LLC to develop next-generation energy storage solutions based on Eos’s Znyt zinc hybrid cathode battery chemistry and its Aurora DC battery system. NEC ES will collaborate with Eos to provide a complete GSS (grid storage solution), which includes DC battery systems, power conversion systems, controls hardware, the NEC ES AEROS® controls software suite as well as service and maintenance packages.

With a strong reputation for safety, reliability and speed of installation, the GSS™ is one of the most widely deployed grid energy storage solutions in the world with over 120MW installed. In the largest deployed sites, exceptional commercial reliability is being achieved with availability factors of over 99%. The GSS™ can also be rapidly deployed and put into commercial operation within six weeks of equipment delivery on-site.

“Looking into the future, we acknowledge that no single energy storage technology will be able to meet the diverse needs of the grid and other stationary applications. This collaboration with Eos is part of our ongoing commitment to develop a comprehensive energy storage technology portfolio for our GSS and provide energy storage capabilities that match evolving industry needs,” said Bud Collins, CEO of NEC ES.

Eos’s Aurora DC battery system is optimized for four hours of continuous discharge and can be used for peak shaving, solar and wind energy time-shifting or transmission and distribution (T&D) grid support.

“With batteries currently being tested with major utility companies around the world, Eos is demonstrating the technology’s viability and its ability to provide DC energy storage systems at pricing levels that increase the number of economically viable applications and opens up new markets to storage,” said Mr. Collins.

The collaboration expands NEC ES energy storage technology offerings and allows the company to supply an Eos-enabled GSS, supporting reliable, secure, efficient and sustainable electricity grid infrastructure.

“With NEC Energy Solutions’ global reach, system integration expertise and track record of reliability, Eos has established a powerful partnership to offer and support turn-key solutions for our Aurora customers worldwide,” said Philippe Bouchard, VP of Business Development at Eos. “At a price of $160/kWh, the Aurora DC battery system offers industry-leading cost, safety, and longevity. Our combined capabilities will create cost-effective, robust, and most importantly, bankable energy storage solutions designed to meet longer duration requirements in a safe and certified package.”

The companies are able to quote turn-key systems today with multi MW-scale volume available in 2016 as Eos gears up for mass production.




— Solar Builder magazine