Spearmint Energy has closed approximately $450 million in project financing to support the development of the Red Egret Battery Energy Storage System (BESS), a 300 MW/600 MWh standalone storage project located in Texas City within the ERCOT electricity market.
Spearmint’s Red Egret Battery Energy Storage System (BESS) Project: Overview
Red Egret BESS project strengthens Spearmint’s position in ERCOT, where grid volatility, renewable penetration and load growth particularly from industrial electrification and data center expansion continue to drive strong demand for dispatchable storage assets. The financing package includes a mix of construction debt, tax equity and capital designed to support both build-out and long-term operation of the project.
Spearmint Energy stated that the financing will accelerate delivery of the project while reinforcing its broader strategy of building a multi-GWh portfolio of battery storage assets across high-growth U.S. power markets. The company continues to position itself as a key independent storage developer focused on grid stabilization and arbitrage optimization in deregulated markets.
Additionally, ERCOT remains one of the most attractive energy markets in the U.S. for battery storage due to extreme price volatility, renewable curtailment challenges, and limited transmission expansion. Projects like Red Egret are increasingly central to balancing peak demand and improving grid reliability.
ERCOT’s Clean Power Momentum
ERCOT’s energy market has become a global hotspot for battery energy storage investment due to its isolated grid structure and high exposure to weather-driven supply-demand imbalances. As solar and wind capacity expand rapidly across Texas, system operators are increasingly dependent on large-scale storage assets to smooth intermittency and provide fast-response capacity during peak load events.
Red Egret BESS project sits within this transition. At 600 MWh, it is sized to deliver multi-hour energy shifting capability, enabling price arbitrage during peak demand windows while also providing ancillary services such as frequency regulation and spinning reserve substitution. This dual revenue stack is important to the bankability of BESS projects in ERCOT, and has attracted many projects including Cross Trails BESS which holds the first physically settled revenue floor contract for a battery storage project in ERCOT.
Red Egret BESS Project Fact Sheet
Developer: Spearmint Energy
Location: Texas City, Texas
Market: ERCOT
Capacity: 300 MW/600 MWh
Technology: Utility-scale lithium-ion battery storage
Financing: US$450 million
Asset Type: Standalone battery energy storage system
Revenue Model: Energy arbitrage and ancillary services
Role: Grid stabilization and peak load support
Status: Financial close achieved; project under construction
Construction Contractor: Mortenson Company
Battery Systems Supplier: SUNGROW
Battery Model: PowerTitan platform
Target Completion Date: 2027
Sitting on 38 acres of remote, heavy-industrial zoned land in Texas City, Red Egret BESS will connect to existing infrastructure at the Freeway Park substation. According to the developer, project location was selected due to the high energy use and projected growth in the area.
The developer also notes the battery installations will stand up to 12 feet tall and will be fully contained. The battery system, according to the developer, will not require water or other public services. Additionally, at the end of Red Egret BESS’ life, project infrastructure will be removed and the site restored.
Project Outlook
Red Egret BESS project financing reflects the sustained interest in U.S. battery storage deployment. Texas, in particular, features merchant exposure and volatility-driven revenue models that remain highly attractive to infrastructure investors.
If Spearmint’s execution proceeds on schedule, the project could become a significant contributor to ERCOT’s evening peak capacity stack. The project would also displace gas peaker dependency and improve renewable integration efficiency within the Texas grid.
Associated Risks
Despite the strong financing momentum for Red Egret BESS project, several risks remain relevant:
- ERCOT price compression risk as storage penetration increases
- Interconnection delays due to grid congestion in Texas
- Regulatory changes affecting tax equity structures
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