Private Equity Plugs In: Why Wall Street is Funding America's Power Grid

JACKSON, MI & NEW YORK, NY – June 17, 2026

In a move that underscores a seismic shift in how America's essential infrastructure is funded and rebuilt, growth-oriented investment firm New Mountain Capital has acquired a majority stake in Commonwealth Associates, a power engineering firm with roots stretching back to 1886. The deal is more than a simple transaction; it's a high-voltage indicator of a larger trend where private capital is surging into the unglamorous but critical world of substations, transmission lines, and power distribution systems.

The investment, which sees industry veteran Dr. Hisham Mahmoud appointed as Chairman of Commonwealth's Board, is a strategic bet on a stark reality: the American power grid is groaning under the weight of unprecedented demand, and the public sector alone cannot foot the bill for its necessary overhaul.

A System Under Strain: The New Realities of Power Demand

For decades, electricity demand in the United States grew at a slow, predictable pace. Utility planners could forecast future needs with relative certainty. That era is definitively over. The grid is now facing a “generational transformation,” a phrase used by both engineers and investors to describe the confluence of challenges and opportunities reshaping the energy landscape.

At the forefront of this shift is an explosive, and largely unforeseen, surge in electricity consumption. The primary driver is the rapid proliferation of data centers, fueled by the insatiable computational needs of artificial intelligence, cloud computing, and cryptocurrency mining. These digital factories are projected to more than double their power consumption by 2035, placing immense localized stress on the grid. This is compounded by the reshoring of advanced manufacturing and the steady electrification of transportation and home heating. According to recent forecasts, the five-year outlook for utility peak load growth has skyrocketed, signaling a fundamental miscalculation in historical planning models.

This new demand is colliding with an old system. Over 70% of the U.S. grid's transmission lines and transformers are over 25 years old, with much of the infrastructure dating back to the mid-20th century. This aging hardware is ill-equipped to handle not only the increased load but also the fluctuating nature of modern energy sources. The transition to renewable energy, while crucial for decarbonization, requires a more dynamic and resilient grid to manage the intermittency of wind and solar power, often generated far from urban demand centers.

This confluence of factors—aging infrastructure, soaring demand, and the green energy transition—has created a multi-trillion-dollar challenge. It has also created a massive opportunity for firms that possess the specialized knowledge to engineer the solution.

The Engineering Linchpin: Commonwealth's Century of Power

Enter Commonwealth Associates. Far from a Silicon Valley startup, the Jackson, Michigan-based firm is a 'pure-play' power engineering company whose history is intertwined with the very development of the American electrical system. Founded on the work of pioneers who engineered some of the nation's first long-distance, high-voltage transmission lines, Commonwealth has built a reputation over 138 years for its deep, specialized expertise.

Unlike broader engineering conglomerates, Commonwealth focuses exclusively on the core components of the power system: the substations that step voltage up or down, the transmission lines that act as energy superhighways, the distribution networks that deliver power to homes and businesses, and the power generation facilities themselves. This specialized focus is now its greatest asset.

“Partnering with New Mountain and Dr. Mahmoud is an exciting next chapter for our Firm — a sentiment unanimously shared by our leadership team,” said Matthew Hales, President and Chief Executive Officer of Commonwealth. “With the deep strategic resources and experience of New Mountain, we are well-positioned to accelerate our growth by expanding our scope, service offerings, and capabilities to meet the increasing demand from our clients and provide more growth opportunities for our people.”

The investment allows Commonwealth, whose leadership and employees retain a significant ownership stake, to scale its operations at a pace commensurate with the market's needs. This means tackling larger, more complex grid modernization projects, expanding into new geographic regions, and potentially acquiring smaller firms to add niche capabilities.

Strategic Capital Meets Seasoned Leadership

The deal is equally revealing of the strategy at New Mountain Capital. The firm, which manages approximately $60 billion in assets, operates on a philosophy of “defensive growth,” targeting market leaders in non-cyclical industries essential to the economy. Rather than relying on financial leverage, New Mountain's approach centers on business building—providing capital and strategic oversight to help strong companies become dominant platforms.

Joe Walker and Lars Johansson, Managing Directors at New Mountain, emphasized this long-term perspective. “New Mountain developed a relationship with Commonwealth over many years as part of our long-standing sector effort in infrastructure services and engineering & consulting... We look forward to supporting the Firm’s continued growth, both organically and through strategic acquisitions, to build a scaled and diversified platform in the industry.”

The appointment of Dr. Hisham Mahmoud as Chairman is the linchpin of this strategy. A titan in the engineering and construction world, Dr. Mahmoud holds a Ph.D. in Civil Engineering and has led global divisions at major firms like SNC-Lavalin and AMEC. As a Senior Advisor at New Mountain, he also holds chairman roles at other key infrastructure portfolio companies, including Qualus, a power services firm. His presence signals a hands-on approach to steering Commonwealth through its next phase of growth.

“I am honored to partner with Matt and the Commonwealth leadership team to help shape and support the delivery of the Firm’s long-term strategy, while strengthening and building on its strong, differentiated culture,” said Dr. Mahmoud. “The power grid is undergoing a generational transformation, and Commonwealth’s expertise positions it at the center of that opportunity.”

This partnership model—combining a legacy engineering firm's technical expertise with a private equity firm's capital and a seasoned industry leader's strategic vision—provides a powerful template for tackling America's infrastructure deficit. It allows specialized firms like Commonwealth to compete for projects that were once the sole domain of giant multinational corporations, bringing focused expertise to bear on critical grid challenges. As the lights flicker in booming data center hubs and utilities struggle to connect new renewable projects, this fusion of old-school engineering and modern finance may be the most critical system we are rebuilding.