Spearmint Energy Secures $450 Million Financing for Major ERCOT Battery Storage Project
Spearmint Energy has successfully closed approximately $450 million in financing to support the development of Red Egret, a large-scale standalone battery energy storage project in Texas City, Texas. The financing package marks another significant step in the company’s strategy to expand grid-scale energy storage capacity across the ERCOT market and strengthen power reliability in one of the fastest-growing electricity regions in the United States.
The Red Egret project will feature a capacity of 300 MW/600 MWh and is designed to provide critical energy storage services to the Texas power grid. The facility is expected to play a major role in improving grid stability, supporting renewable energy integration, and helping address rising electricity demand throughout the Texas Gulf Coast region.
The financing package includes a combination of construction financing, Investment Tax Credit (ITC) transfer proceeds, and preferred equity investments. Together, these components create a comprehensive funding structure that will support the construction and long-term operation of the battery energy storage system.
According to Spearmint Energy, the project comes at a time when aging infrastructure and accelerating power demand are increasing pressure on electricity systems across the United States. Battery storage has become a critical technology for balancing intermittent renewable generation, improving grid resilience, and ensuring reliable power delivery during periods of high demand or extreme weather conditions.
Andrew Waranch, Founder, President, and Chief Executive Officer of Spearmint Energy, said the financing demonstrates the company’s commitment to enhancing energy reliability in ERCOT through advanced battery storage infrastructure.
He noted that the growth of electricity demand, combined with challenges facing aging transmission and generation assets, is creating an urgent need for modern energy solutions capable of supporting long-term grid resilience. Through the Red Egret development, Spearmint aims to provide safe, reliable, and cost-effective electricity support to homes and businesses throughout Texas City and the broader Gulf Coast area.
The construction financing portion of the transaction totals approximately $225 million and will be used to support the engineering, procurement, and construction phases of the project. The financing facility was arranged by a consortium of financial institutions led by First Citizens Bank and Investec, which acted as Coordinating Lead Arrangers and Joint Bookrunners.
Additional support for the financing was provided by Nord/LB as Joint Lead Arranger and East West Bank as Mandated Lead Arranger. The participation of multiple banking institutions highlights growing investor confidence in utility-scale battery storage projects and the expanding role of energy storage within the broader power infrastructure sector.
Spearmint Energy stated that the construction facility will eventually be repaid once the Red Egret project reaches commercial operations. To facilitate that transition, the project also secured $96 million in preferred equity financing from Nuveen Energy Infrastructure Credit, the infrastructure credit investment platform of Nuveen, which is backed by TIAA.
The preferred equity investment provides additional long-term capital support and reflects increasing institutional interest in energy transition assets. Large-scale battery storage systems have become increasingly attractive to investors seeking stable infrastructure opportunities tied to clean energy growth and grid modernization initiatives.
In addition to debt and equity financing, the Red Egret project will also benefit from approximately $126 million in proceeds generated through an Investment Tax Credit transfer commitment. The ITC transfer mechanism, enabled through recent U.S. clean energy legislation, allows developers to monetize tax credits more efficiently and accelerate investment into renewable and storage projects.
Industry analysts view tax credit transfer structures as an important financial innovation that can improve liquidity and reduce financing barriers for energy infrastructure developers. For battery storage projects specifically, the availability of transferable tax credits has helped unlock significant new capital flows into the sector.
Construction activities for the Red Egret facility have already commenced. The project continues Spearmint Energy’s collaboration with Minneapolis-based M.A. Mortenson Company, which is serving as the builder for the development. Red Egret represents the fourth battery storage project constructed for Spearmint by Mortenson, reflecting an ongoing partnership between the two companies in delivering utility-scale energy infrastructure.
The project will also utilize the PowerTitan battery energy storage platform supplied by Sungrow USA Corporation. Red Egret becomes the fourth Spearmint project to deploy Sungrow’s PowerTitan technology, demonstrating continued confidence in the platform’s capabilities for large-scale battery storage operations.
Battery energy storage systems such as Red Egret are becoming increasingly important within the ERCOT market as Texas experiences rapid population growth, industrial expansion, and increasing penetration of renewable energy resources including wind and solar power. Energy storage systems help address intermittency challenges by storing excess electricity during periods of high generation and discharging power when demand rises or renewable output declines.
ERCOT has emerged as one of the most active battery storage markets in North America due to its competitive electricity structure, strong renewable development pipeline, and growing need for flexible grid resources. Developers and investors continue to announce major storage projects across Texas as utilities and grid operators seek additional reliability solutions.
Upon completion in 2027, Red Egret will significantly expand Spearmint Energy’s operational portfolio. The company said that once all four of its battery storage projects are operational, its total battery capacity will exceed 1.5 GWh.
The milestone reflects the company’s broader strategy of establishing itself as a major participant in the U.S. energy storage market. Spearmint Energy focuses on developing, owning, and operating large-scale battery energy storage projects designed to support grid reliability and facilitate the transition toward cleaner energy systems.
Legal and advisory support for the financing transaction involved several major law firms. Paul Hastings LLP served as counsel for Spearmint Energy, while Willkie Farr & Gallagher LLP represented the lenders involved in the construction financing.
Additional legal counsel included Skadden, Arps, Slate, Meagher & Flom LLP, which advised the tax credit purchaser, and Milbank LLP, which represented the preferred equity investor.
The successful financing close underscores growing momentum behind battery storage deployment across the United States. As electricity markets increasingly prioritize reliability, flexibility, and decarbonization, energy storage is expected to remain a central component of future grid infrastructure investment.
Projects such as Red Egret illustrate how developers, financial institutions, technology providers, and institutional investors are collaborating to accelerate deployment of next-generation energy systems capable of supporting evolving power market demands.
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