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TRANSFORMING
THE ELECTRIC GRID

Plus Power develops, owns, and operates battery energy storage systems that enable a more efficient and reliable electric grid.

World's largest
grid-forming performance by a battery system
10
GW in development
More than 28
U.S. states + Canadian provinces
1650 / 4150
MW / MWh operating or in construction
Solving Hard
Grid Problems

Our energy storage projects enhance grid stability by storing excess energy and injecting it back into the grid when it is needed during record peaks, storms, and unexpected demand.

This offers the fastest-dispatch, flexible resources for an aging grid, providing not just energy or capacity but — uniquely — power plant-like grid services at scale.

 

 

 

About Us
Highlights

Fueling a future powered by dependable and innovative energy solutions.

Energy Storage
Creates Value
Reliability
Plus Power’s battery storage facilities help replace aging generation and asset retirements by supporting capacity needs and grid-forming ancillary services.
Efficiency
Plus Power systems help makes the grid more efficient in milliseconds, by smoothing variable generation and reducing congestion when there is too much energy or demand on the grid.
Featured Projects

Our industry-leading projects provide targeted solutions for electricity grids across the U.S., solving problems old and new as the grid evolves.

View All Projects
People
The Innovative
Plus Power Team

Our stunningly-talented team affords Plus Power unique in-house execution from design to operations. Led by seasoned executives from the energy and battery storage industries, Plus Power’s team is built on a culture of curiosity, respect, and transparency. We apply an intentional mindset to development by prioritizing local relationships, optimal siting considerations, and environmental stewardship.

Our People

News

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Gambit
Angleton, TX · 100 MW / 175 MWh
Gambit
Delivering in milliseconds during record needs

Operational since Summer 2021, the Gambit project is one of the largest operational standalone lithium-ion battery energy storage projects in Texas. Plus Power began development in 2019.

Watch a video on how Gambit is supporting the Texas power grid.

Kapolei (KES)
Kapolei, HI · 185 MW / 565 MWh
Kapolei (KES)
Balancing Oahu’s electric system for HECO

Operational since December 2023, Kapolei Energy Storage (KES) is ideally located on roughly eight acres of land on the island of Oahu, where it interconnects at a critical Hawaiian Electric substation. The project provides load shifting and fast-frequency response services to Hawaiian Electric, enhancing grid reliability and resiliency. KES plays a crucial role in keeping the many military bases and installations across Oahu reliably powered. 

Rodeo Ranch
Pecos, TX · 300 MW / 600 MWh
Rodeo Ranch
Helping ERCOT meet rising demand

Operational since December 2023, the Rodeo Ranch battery energy storage project contributes real-time energy and frequency-stabilizing services to the Texas market.

Anemoi
Edinburg, TX · 200 MW / 400 MWh
Anemoi
Helping the ERCOT grid with power stability

Operational since June 2024, Anemoi provides real-time energy and grid-stabilizing services to the ERCOT market in Texas.

Ebony
San Antonio, TX · 200 MW / 400 MWh
Ebony
A new addition to fast-response energy resources in ERCOT

Operational since June 2024, Ebony is a new lithium-ion battery energy storage facility that will help smooth out intermittent energy in the ERCOT grid. 

Sierra Estrella
Avondale, AZ · 250 MW / 1000 MWh
Sierra Estrella
Providing enhanced capacity in Arizona for SRP

The Sierra Estrella Energy Storage project is ideally located on roughly 11 acres of land in Avondale, Arizona, where it interconnects adjacent to the 230kV bus of the Rudd substation, an existing critical exchange on the grid. The project, which began commercial operations in June 2024, holds up to 250 MW / 1,000 MWh of battery energy capacity, providing enhanced grid reliability and directly supporting the incoming Prime Data Center campus next door. 

Superstition
Gilbert, AZ · 90 MW / 360 MWh
Superstition
Supporting grid reliability for SRP

Superstition Energy Storage (Superstition) is ideally located on an industrially zoned parcel in the Town of Gilbert, Arizona, immediately adjacent to the critically important, existing 230kV Corbell Substation. The 90 MW / 360 MWh battery storage facility provides capacity and energy services to the Salt River Project (SRP) electrical grid in southeast Phoenix, enhancing grid reliability.

Cross Town
Gorham, ME · 175 MW / 350 MWh
Cross Town
Decongesting the grid in Maine

Cross Town is a landmark lithium-ion battery energy storage facility in Maine that will help bring upstate resources downstate and ease local grid congestion. 

Cranberry Point
Carver, MA · 150 MW / 300 MWh
Cranberry Point
Replacing retiring generation in Massachusetts

Cranberry Point is a groundbreaking new lithium-ion battery energy storage facility that will make Massachusetts’ grid more reliable.

Corazon
Albuquerque, NM · 150 MW / 600 MWh
Corazon
Helping PNM meet growing energy demand

Corazon Energy Storage was awarded a 20-year contract by Public Service Company of New Mexico (PNM), subject to regulatory approvals. The facility will enhance grid reliability and provide much-needed capacity to support PNM’s customer load requirements. 

Maya
Monterrey, Mexico · 12 MW / 12 MWh
Maya

Operational since October 2018, the Maya project is the largest operational lithium-ion battery energy storage project in Mexico and helps balance the power flow of a 100MW+ industrial microgrid.

Bat Cave
Mason County, TX · 100 MW / 100 MWh
Bat Cave

The Bat Cave project was sold to Broad Reach Power in 2020 and came online in 2021.

North Fork
Williamson County, TX · 100 MW / 100 MWh
North Fork

The North Fork project was sold to Broad Reach Power in 2020 and came online in 2021.

Sierra
Jamestown, CA · 10 MW / 40 MWh
Sierra

Anticipated to come online in 2023, the Sierra project will be the first large-scale battery system co-located with a biomass power plant.

Cascade
Stockton, CA · 25 MW / 100 MWh
Cascade

Anticipated to come online in 2022, the Cascade project was sold to Broad Reach Power in November 2020. 

IID
El Centro, CA · 32 MW / 20 MWh
IID

Operational since October 2016, the IID project, owned and operated by the Imperial Irrigation District, provides stability and power-quality mitigation services for the local IID grid.

This system achieved the first-ever black start of an operational generator by a battery energy storage system.

CISION PR Newswire | Plus Power Battery Storage Project Wins Public Service Company of New Mexico Award
November 25, 2024

CISION PR Newswire | Plus Power Battery Storage Project Wins Public Service Company of New Mexico Award

Today, Plus Power announced that its 150 MW / 600 MWh Corazon Energy Storage project was awarded a 20-year contract by Public Service Company of New Mexico (PNM), subject to regulatory approvals, in response to the utility’s 2026-2028 Generation Resources Request for Proposals. The RFP was issued in 2022 and sought projects that will help serve growing energy demand in New Mexico. PNM filed with the New Mexico Public Regulation Commission for approval of the project on Nov. 22, 2024.

Arizona Republic | SRP deploys state’s largest battery system to handle peak energy demand spikes
June 25, 2024

Arizona Republic | SRP deploys state’s largest battery system to handle peak energy demand spikes

Salt River Project is deploying two new industrial-scale battery storage systems, including the state’s largest so far, to absorb excess energy when it’s not needed for release at later periods when demand spikes. The 250 MW Sierra Estrella facility, on nine acres in Avondale, became the largest standalone battery system in Arizona when it went online earlier this month, SRP said. It will store enough energy to power more than 56,000 residences for four hours. The 90 MG Superstition Energy facility in Gilbert will store enough power for 20,000 homes for four hours.

SRP | Two New Batteries on SRP’s Grid will Advance Reliable and Sustainable Power for SRP Customers
June 24, 2024

SRP | Two New Batteries on SRP’s Grid will Advance Reliable and Sustainable Power for SRP Customers

Salt River Project (SRP) and Plus Power today celebrated two new grid-charged battery storage systems, Sierra Estrella Energy Storage and Superstition Energy Storage. Together, these facilities will add 340 megawatts (MW) / 1,360 megawatt-hours (MWh) of additional battery storage capacity to SRP’s system – enough to power 76,000 residential homes for a four-hour period. The batteries will absorb excess energy when customer demand is lower and store it for use during times of peak demand.

CISION PR Newswire | First Major Standalone Battery Storage Project in ISO-NE Closes Financing
June 13, 2024

CISION PR Newswire | First Major Standalone Battery Storage Project in ISO-NE Closes Financing

Today, Plus Power™ announced the close of construction and term financing for the first major utility-scale standalone battery storage system in construction on the New England grid, among other notable firsts for standalone storage in the region. The Cranberry Point facility, located in Carver, Massachusetts, will help stabilize the electric grid during the region’s increasing number of extreme weather events while helping to suppress volatile wholesale prices for ratepayers.

CISION PR Newswire | Plus Power Secures Additional $82 Million of Tax Equity for Battery Storage Projects
May 1, 2024

CISION PR Newswire | Plus Power Secures Additional $82 Million of Tax Equity for Battery Storage Projects

Plus Power™ announced the closing of an $82 million tax equity investment from Morgan Stanley for the 90 MW / 360 MWh Superstition Energy Storage facility in Gilbert, Arizona. Plus Power, which leads the sector for developing, owning, and operating standalone energy storage, has raised a total of approximately $2 billion for five total facilities in Arizona and Texas since October 2023. These investments will enable Plus Power to bring the facilities online by summer 2024, helping stabilize electric grids in the Southwest during extreme weather.

CISION PR Newswire | Plus Power Secures Nearly $100 Million Tax Equity Financing for Merchant Battery Storage Project in ERCOT
February 15, 2024

CISION PR Newswire | Plus Power Secures Nearly $100 Million Tax Equity Financing for Merchant Battery Storage Project in ERCOT

Today, Plus Power™ announced the completion of approximately $98 million in tax equity investment for its 200 MW / 400 MWh Ebony Energy Storage facility in Comal County, Texas. The investment from Greenprint Capital Management will help the project stabilize ERCOT’s power system during dynamic summer demand and cold winter storms. 

Plus Power | Rodeo Ranch Energy Storage in West Texas helped avert blackouts during latest winter storm
January 17, 2024

Plus Power | Rodeo Ranch Energy Storage in West Texas helped avert blackouts during latest winter storm

This week, as projected cold temperatures in Texas reached almost Winter Storm Uri level, ERCOT faced eye-popping record demand again—and 15 GW of unavailable resources according to ERCOT—but the grid didn’t go into rolling blackouts or fail. The reasons include Plus Power’s third utility-scale battery plant to go online, now the largest operating standalone battery energy storage facility in Texas: Rodeo Ranch in Pecos.

Hawaiʻi Public Radio | Hawaiʻi’s largest energy storage project now online in Kapolei
January 9, 2024

Hawaiʻi Public Radio | Hawaiʻi’s largest energy storage project now online in Kapolei

The utility-scale battery farm kicked off commercial operations shortly before the holidays. It has a storage capacity of 565 megawatt-hours of electricity, making it the largest storage project in the state.

The Maine Monitor | Maine’s first giant battery project set for construction in Gorham
January 7, 2024

The Maine Monitor | Maine’s first giant battery project set for construction in Gorham

Construction is set to begin this spring in Gorham on one of New England’s largest battery storage projects. 

Norton Rose Fulbright Currents Podcast | Ep233: Plus Power on stand-alone energy storage
November 30, 2023

Norton Rose Fulbright Currents Podcast | Ep233: Plus Power on stand-alone energy storage

Ep233: Plus Power on stand-alone energy storage 
Hear Josh Goldstein on market diversity
0:00

Brandon Keefe and Josh Goldstein join Todd Alexander to discuss stand-alone battery storage. They talk about why stand-alone is the energy storage approach they pursued, the future of such energy storage projects, how investors have responded and more.

CISION PR Newswire | Major leap forward for standalone battery energy storage, as sector leader Plus Power raises additional $1.8 billion to help stabilize the power grid
October 17, 2023

CISION PR Newswire | Major leap forward for standalone battery energy storage, as sector leader Plus Power raises additional $1.8 billion to help stabilize the power grid

Plus Power LLC announced completion of $1.8 billion in new financing for standalone battery storage, including the largest single such project financing to date, to help stabilize the U.S. electrical grid.

Power Finance & Risk | Plus Power garners $1.8bn for 1 GW BESS projects
October 17, 2023

Power Finance & Risk | Plus Power garners $1.8bn for 1 GW BESS projects

Plus Power has completed a $1.8 billion financing for its standalone battery storage pipeline to help stabilize the grid.

S&P Global Market Intelligence | Plus Power secures landmark $1.8B for US battery stations as ‘tidal wave’ nears
October 17, 2023

S&P Global Market Intelligence | Plus Power secures landmark $1.8B for US battery stations as ‘tidal wave’ nears

The Houston-based developer of stand-alone battery systems announced a series of deals with major lenders and investors to bring online more than 1 GW at five projects under construction in Arizona and Texas before next summer.

The Texas Tribune | As Brutal Heat Tests Texas’ Power Grid, Batteries Play a Small But Growing Role in Keeping the Lights On
September 12, 2023

The Texas Tribune | As Brutal Heat Tests Texas’ Power Grid, Batteries Play a Small But Growing Role in Keeping the Lights On

The Texas Tribune explains how battery energy storage, including Plus Power’s Gambit Energy Storage in Angleton, helped Texas avoid rolling blackouts throughout the record-breaking summer.  “This summer, batteries have mostly sold their power to meet high demand around 7 p.m. or 8 p.m. when solar production winds down as the sun sets but temperatures are still high. Energy consultant and battery advocate Doug Lewin calls that the “white knuckle part of the evening” for ERCOT, when batteries’ relatively small contribution to the grid can still be “determinative” to meeting what has been record-high demand during Texas’ second-hottest summer ever.”

EnergyCapitalHTX | Energy storage startup moves into larger Houston-area space, plans to grow team
July 14, 2023

EnergyCapitalHTX | Energy storage startup moves into larger Houston-area space, plans to grow team

Houston media reports on Plus Power’s establishment of our headquarters in The Woodlands, Texas. “One of Plus Power’s storage facilities is the 100-megawatt Gambit project, which opened two years ago in Angleton. The nearly eight-acre facility supports power supplies for the Electric Reliability Council of Texas (ERCOT), which runs the power grid for 90 percent of Texas.”

The National Law Review | Massachusetts DPU Approves Zoning Bylaw Exemptions for Two Energy Storage Projects
July 6, 2023

The National Law Review | Massachusetts DPU Approves Zoning Bylaw Exemptions for Two Energy Storage Projects

The National Law Review on the Massachusetts Department of Public Utilities approval for Plus Power’s Cranberry Point Energy Storage in Carver, MA.  “Per the Order, the Department also found that the projects are necessary and will provide public benefits, and that the alternative sites evaluated, or no-build alternatives, are inferior to the proposed locations and plans. The Department also evaluated public health and safety issues related to potential fire risks at the proposed project sites, details about battery operating technology, water and wetlands impacts and issues pertaining to land use.”

PV Magazine | “Construction Nears on New Salt River Project Large-Scale Battery Storage Facility”
April 13, 2023

PV Magazine | “Construction Nears on New Salt River Project Large-Scale Battery Storage Facility”

Officials from Arizona public power utility Salt River Project, Plus Power LLC and the City of Avondale, Ariz., on April 12 gathered for a ceremonial groundbreaking to kick off construction mobilization at a new large-scale battery facility.

AZ Central | “SRP starts work on Arizona’s largest standalone battery project in this metro Phoenix city”
April 13, 2023

AZ Central | “SRP starts work on Arizona’s largest standalone battery project in this metro Phoenix city”

SRP and Houston-based Plus Power LLC, joined by officials from Avondale, held a ceremonial ground breaking at the previously announced battery facility Wednesday. The new Sierra Estrella energy storage facility will hold electricity produced during low-use periods and release it when demand is higher, helping to power more than 56,000 average-sized homes for a four-hour period.

Litchfield Park Independent | “SRP, Plus Power and Avondale to break ground on large-scale battery storage facility”
April 5, 2023

Litchfield Park Independent | “SRP, Plus Power and Avondale to break ground on large-scale battery storage facility”

Local Phoenix independent newsmedia covering the groundbreaking of our new large-scale battery facility, Sierra Estrella Energy Storage, with Salt River Project and officials from the city of Avondale.

S&P Global | “Supercharged: U.S. Energy Storage Reaches for Deeper Impact”
January 25, 2023

S&P Global | “Supercharged: U.S. Energy Storage Reaches for Deeper Impact”

Plus Power COO Julie Blunden joined Garret Hering’s Supercharged virtual webinar to discuss the opportunities and the considerable challenges ahead for battery storage. “It will be a while before we have fully domestic batteries for energy storage—but that may not be the requirement.”

S&P Global | “’We’re in a perpetual short’: US energy storage CEOs face limits of growth”
December 30, 2022

S&P Global | “’We’re in a perpetual short’: US energy storage CEOs face limits of growth”

Garrett Hering on a second great piece on the unprecedented volumes of battery storage” in development: “roughly 57 GW of large-scale energy storage resources are planned for connection to the U.S. grid between 2022 and 2025.”  “Over the next three years, I think we’re in a perpetual short,” said Brandon Keefe, CEO of Houston-based developer Plus Power, which is offering its near-term excess battery cell orders to fellow developers short on supplies. “Those who already went out and procured supply are going to have successful projects and those who don’t [have batteries] are going to have issues.”

S&P Global | “US energy storage wave builds strength amid delays”
November 15, 2022

S&P Global | “US energy storage wave builds strength amid delays”

Garrett Hering on the coming wave of energy storage deployments, starting with Plus Power’s Kapolei Energy Storage facility in Hawaii and our 250-MW Sierra Estrella Energy Storage and 90-MW Superstition Energy Storage facilities for Salt River Project. The piece notes that Plus Power has secured an excess of battery supply—6.5 GWh—to serve our projects coming online through 2025 and more. “The next year is going to be a game of musical chairs of those who have supply and those who don’t,” Keefe said. “Plus Power is talking with fellow developers in need.”

Phoenix Business Journal | “SRP signs deal for two more battery storage stations to handle peak power demand”
October 27, 2022

Phoenix Business Journal | “SRP signs deal for two more battery storage stations to handle peak power demand”

Salt River Project said Thursday that it will add two new battery storage systems that will go online in 2024 with a combined output of 340 megawatts, giving the Arizona utility company more options during times of heavy power demand.  SRP said it signed contracts with Houston-based Plus Power for the two projects, which will be built in Avondale and Gilbert.

Honolulu Star Advertiser | “Energy storage for Oahu taking shape in Kapolei”
September 13, 2022

Honolulu Star Advertiser | “Energy storage for Oahu taking shape in Kapolei”

Andrew Gomes covers the construction of Plus Power’s Kapolei Energy Storage facility: “The project by San Francisco-­based Plus Power will be the largest stand-alone energy storage system in the state.”

KHON2 News | “Kapolei energy storage facility set to modernize power grid”
September 12, 2022

KHON2 News | “Kapolei energy storage facility set to modernize power grid”

The KES facility will be the first of its kind in the state.

Maine Public Radio | “Big batteries are quickly becoming part of Maine’s electric grid”
July 19, 2022

Maine Public Radio | “Big batteries are quickly becoming part of Maine’s electric grid”

Murray Carpenter interviews State Representative Mo Terry on Maine’s electrified future: “The storage facilities that we have right now are on the smaller size, 10-15 megawatts per facility, where the one that’s coming to Gorham is hopefully going to be up to about 150 megawatts of storage,” she says. That proposed facility, Plus Power’s Cross Town Project, would be about 17 times the size of the Tesla system near East Millinocket. That’s about enough to power 150,000 Maine homes for two hours.

Plus Power Team-members Nationally Recognized
April 14, 2022

Plus Power Team-members Nationally Recognized

Congratulations to two national award winners at Plus Power. Samane Zeyghami, our Head of Analytical Solutions, was just recognized by the Energy Storage Report in their “List of Top 40 Women Leaders in Energy Storage.” And Allyson Sand, our Market Lead – Development for the Northeast, was recently recognized as one of three “Breakout Woman of the Year” awardees by the Energy Storage Association. Congratulations to Samane and Allyson!

Our Presence Today
January 2, 2022

Our Presence Today

Since early 2018, Plus has aggregated one of the most unique standalone storage portfolios in the United States. Plus has over 7,000 MW of projects across 20+ states and is active in nearly all major RTOs & markets.

Cision PR Newswire | Plus Power Closes $219 Million Non-recourse Project Finance and Credit Facilities for 185 MW/565 MWh Kapolei Energy Storage Project
November 9, 2021

Cision PR Newswire | Plus Power Closes $219 Million Non-recourse Project Finance and Credit Facilities for 185 MW/565 MWh Kapolei Energy Storage Project

Largest project financing for standalone energy storage

Hawaii News Now (Extended TV news clip) | “Groundbreaking begins in Kapolei for state’s largest stand-alone battery system”
August 11, 2021

Hawaii News Now (Extended TV news clip) | “Groundbreaking begins in Kapolei for state’s largest stand-alone battery system”

Video coverage of the August 11, 2021 KES Ground Blessing as aired on Hawaii’s KGMB and KHNL TV stations.

Forbes | “Plus Power: Charging Into New Storage Markets”
August 6, 2021

Forbes | “Plus Power: Charging Into New Storage Markets”

Peter Kelly-Detwiler on Plus Power’s data-driven strategies to deploy utility-scale stand alone energy storage across the U.S.

Utility Dive | “Hawaiian Electric asks regulators to approve nearly 2 GWh storage, 300 MW solar contracts”
September 18, 2020

Utility Dive | “Hawaiian Electric asks regulators to approve nearly 2 GWh storage, 300 MW solar contracts”

Plus Power is developing the standalone Kapolei Energy Storage (KES) project on Oahu. “With a commercial operation date of June 2022, the 185 MW KES project will help facilitate the retirement of the last coal plant in Hawaii,” Allyson Sand, a developer with Plus Power, said in an email. The island’s 180 MW coal plant, owned by AES, is set to retire in September 2022.

RTO Insider | “Overheard at NY-BEST’s 10th Annual Meeting”
August 11, 2020

RTO Insider | “Overheard at NY-BEST’s 10th Annual Meeting”

“At the state level, we see a lot of positive activity happening, with significant investment from the utilities and from NYISO to incorporate storage,” Sand said.

1
Highlight
Enhancing Power Reliability
During record summer energy demand and unexpected winter storms, Plus Power’s Gambit Energy Storage facility responds in milliseconds to help keep the lights on.
Highlight
Elevating Energy Resilience
Phoenix set a record of 31 straight days of 110-degree temperatures in July 2023, the hottest month ever for a U.S. city. The grid needs fast flexibility to adapt, namely storage. Plus Power’s 250 MW / 1000 MWh Sierra Estrella Energy Storage project in Avondale has a 20-year contract with Salt River Project (SRP). Sierra Estrella absorbs and holds lower-cost energy until demand rises. The facility serves as critical grid infrastructure to support the adjacent Prime Data Center campus. The facility will also give SRP more experience in dispatching storage. SRP expects storage projects like these to supply more than 10% of its peak-hours electricity demand in 2024, equivalent to around 56,000 homes for up to 4 hours in summer peak conditions.
Highlight
Supply Chain Expertise
Plus Power saw the coming supply shortage early and moved to secure batteries for all its projects coming online by 2025—6.5 MWh worth. Read S&P Global’s insights on the unprecedented volumes of battery storage in development across the U.S. and globe. "Over the next three years, I think we're in a perpetual short," said Brandon Keefe, CEO of Houston-based developer Plus Power... "Those who already went out and procured supply are going to have successful projects and those who don't [have batteries] are going to have issues."