On January 6 2026, Blackstone Energy Transition Partners announced the acquisition of Alliance Technical Group (AT G), a leading provider of environmental testing, monitoring and compliance services. The deal adds AT G’s extensive laboratory and field‑service capabilities to Blackstone’s growing portfolio of sustainability‑focused investments.
AT G, founded in 2000 and headquartered in Alabama, operates more than 60 offices and laboratories across the United States and Canada and employs over 2,200 staff. Its core offerings include source and laboratory testing, continuous emission monitoring systems (CEMS) and leak detection and repair services—capabilities that are increasingly in demand as global emissions standards tighten and industrial facilities seek to demonstrate regulatory compliance.
Blackstone’s strategy has long focused on high‑growth, high‑margin service businesses that support the energy transition. The firm has invested in companies such as Maclean Power Systems, Wolf Summit Energy, Hill Top Energy Center, Shermco, Enverus, Lancium and Westwood, and has committed more than $27 billion of equity across its energy‑transition funds, including a $5.6 billion Blackstone Energy Transition Partners IV fund. The AT G acquisition aligns with this thesis by expanding Blackstone’s footprint in the environmental services sector and positioning it to capture demand for regulated solutions as emissions regulations become more stringent.
Senior Managing Director Darius Sepassi said, “Alliance is a clear market leader in emissions testing and monitoring, providing mission‑critical services that directly support customers’ compliance and operational performance.” CEO Chris LeMay added, “Blackstone’s investment is a testament to our strong organic and strategic growth as a trusted market leader in the testing, inspection and compliance sector.” Global Head of Blackstone Energy Transition Partners, David Foley, noted, “Our investment strategy focuses on identifying leading businesses that will disproportionately benefit from the growing demand for electricity and the broader energy transition. We are excited to back Alliance, which plays a critical role in helping energy and industrial facilities operate safely, efficiently, and in compliance with environmental regulations.”
The acquisition strengthens Blackstone’s ability to offer end‑to‑end environmental solutions across its energy and infrastructure platforms, creating cross‑sell opportunities and reinforcing its position as a key player in the transition to cleaner energy. AT G’s established service network and expertise in emissions monitoring will enable Blackstone to meet the growing needs of regulated facilities, while the transaction’s undisclosed value reflects the strategic nature of the deal rather than a focus on financial metrics. Advisors to the transaction included Harris Williams and RBC for Blackstone, Piper Sandler for AT G, and legal counsel from Kirkland & Ellis and Jones Day.
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