By Aaron Vale, CAIA, CFA, MFin, Global Managing Director, Mexico Infrastructure Partners
In recent years, owning a natural gas power plant in the U.S. felt tenuous, a position fraught with uncertainty. Today, it has transformed into one of the most coveted assets within private infrastructure portfolios. Investors who astutely recognized and acted upon this seismic shift have been significantly rewarded. To fully grasp this transformation, one must trace the arc from a period of explosive growth to a subsequent downturn, and finally, to its current revitalized state. This evolution is not merely a cyclical fluctuation but a fundamental recalibration of the energy landscape, driven by technological advancements, shifting demand patterns, and geopolitical realities.
From Boom to Bust: A Decade of Shifting Fortunes
The U.S. natural gas power sector experienced a golden era in the late 1990s and early 2000s, a period that catalyzed a significant expansion in generation capacity. The deregulated electricity markets, coupled with the availability of cheaper natural gas and a growing demand for power, spurred a widespread buildout of highly efficient Combined Cycle Gas Turbines (CCGTs). These plants quickly became indispensable components of the American power grid, powering industrial processes, commercial enterprises, and residential consumers alike. Independent power producers and infrastructure sponsors raised billions of dollars to finance, construct, and operate these vital energy facilities.
However, around 2007, the landscape began to shift dramatically. Electricity demand, which had been on a steady upward trajectory, started to plateau. Simultaneously, renewable energy sources, particularly solar and wind, experienced a surge in investor interest, fueled by substantial tax credits and rapidly declining installation costs. This propelled renewables to the forefront of investment flows, while coal-fired power generation, once a dominant force, began a precipitous decline. Despite these fundamental changes, natural gas generation continued to grow, ultimately solidifying its position as the primary source of electricity generation in the United States.
This dominance, however, masked growing vulnerabilities. By the early 2020s, merchant gas plants – those that sell electricity on the open market without long-term contracts – found their cash flows severely eroded. A decade of persistently low wholesale power prices, exacerbated by increased competition from renewables and a lack of significant demand growth, created a challenging economic environment. This pressure cooker of low revenues and high operating costs led to a wave of bankruptcies and distressed sales as certain projects struggled to meet their debt obligations. Infrastructure investors, reflecting these market realities, shifted their capital decisively away from natural gas, prioritizing renewables as the evident present and future of energy investment. This period represented a significant retrenchment, signaling a widespread belief that the era of profitable natural gas power investment had passed.
The Demand Shock: AI and Electrification Reshape the Grid
The narrative surrounding natural gas power began to pivot dramatically in 2023 with the unforeseen emergence of artificial intelligence (AI) as a significant electricity consumer. Data centers, the engine rooms of AI development and deployment, consumed approximately 4% of the total U.S. electricity in 2023. Projections, however, indicate a startling acceleration, with this share expected to reach between 10% and 12% by 2028. This exponential growth is driven by hyperscalers racing to build out massive compute capacity required for training and inference workloads associated with large language models and other advanced AI applications. The power demands of these sophisticated AI systems are orders of magnitude greater than those of traditional enterprise computing, creating an unprecedented and rapidly accelerating demand surge.
This AI-driven demand is not an isolated phenomenon. It is occurring concurrently with other significant electrification trends that are placing immense strain on the existing power grid. The widespread adoption of electric vehicles (EVs), the electrification of industrial processes, and a strategic reshoring of domestic manufacturing are all contributing to a mounting demand for electricity. This confluence of factors is stacking new load onto a system that, in many regions, has experienced minimal net addition of dispatchable capacity over the past decade. Consequently, grid operators are now projecting sustained tightening of reserve margins – the buffer of available electricity capacity above peak demand – to levels not seen in a generation. This tightening of reserve margins is a critical indicator of potential grid instability and underscores the urgent need for reliable, on-demand power sources.
The growth of renewable energy, while crucial for decarbonization, cannot solely address this evolving demand landscape. Wind and solar power, by their very nature, remain intermittent sources, dependent on weather conditions. While battery storage technologies are advancing rapidly, current deployments typically provide hours of backup power, not the continuous, unwavering reliability that the grid requires, especially during peak demand periods. When the grid needs power instantaneously and consistently, a natural gas power plant is the resource that is called upon. This fundamental operational reality, which may have been downplayed in policy discussions during periods of lower demand growth, is now impossible to ignore. The essential role of dispatchable generation, like that provided by natural gas plants, is reasserting itself with renewed urgency.
The U.S. Structural Edge: Abundant and Affordable Fuel
A critical feature of this current energy moment is the enduring cost advantage of American natural gas. Domestic production is forecast to reach record highs, projected to be between 120 and 122 billion cubic feet per day through 2026-2027. This robust supply is expected to keep U.S. natural gas prices structurally lower than international import benchmarks prevalent in Europe and Asia. For natural gas-fired generators, the cost of feedstock represents the primary variable expense. Therefore, a well-positioned U.S. plant benefits significantly from its proximity to abundant, low-cost natural gas supplies. This inherent advantage has been further reinforced by recent geopolitical conflicts, particularly in Ukraine and the Middle East, which have exerted additional pressure on global energy import prices and highlighted the strategic importance of secure, domestic energy sources.
The sustained availability and affordability of natural gas in the U.S. create a distinct competitive advantage for domestic power generation. This price differential insulates U.S. generators from the volatility that can impact regions reliant on imported liquefied natural gas (LNG), thereby providing a more predictable and stable operating environment. This fundamental economic reality is a key driver behind the renewed investor interest in U.S. natural gas power assets.
Capital Markets Respond: A Surge in M&A and Valuation Shifts
The capital markets have reacted swiftly to these evolving fundamentals. Energy sector Mergers and Acquisitions (M&A) activity surged, totaling nearly $142 billion in the twelve months concluding November 2025, a significant increase from under $28 billion in the preceding year. This dramatic uptick signals a robust appetite for energy assets. Deal multiples have also expanded sharply, with recent private market transactions for natural gas power facilities clearing at enterprise value to EBITDA (EV/EBITDA) multiples ranging from 7x to 8x and higher. The monumental $26.6 billion acquisition of Calpine by Constellation Energy stands as a landmark transaction, representing the largest private power sector deal in U.S. history, underscoring the significant capital being deployed in this sector.
Despite this surge in activity and expanding valuations, current market prices for operating natural gas plants remain below their replacement costs. The construction of new greenfield CCGT facilities can range from $2,200 to $3,000 per kilowatt. In contrast, operating brownfield assets are currently trading at significantly lower figures, between $700 and $1,350 per kilowatt. This substantial discount provides a meaningful margin of safety for investors and reflects a hard structural reality: there is no rapid solution to the growing demand through new construction. Interconnection backlogs, permitting timelines that can extend for years, and gas turbine delivery queues extending to 2030 all present significant hurdles to rapid capacity expansion. This scarcity of new build capacity further enhances the value of existing, operational assets.
Navigating Risk: Greenfield Development vs. Brownfield Acquisitions
For investors, the decision between acquiring existing operating plants (brownfield) and undertaking new construction projects (greenfield) presents distinct risk profiles and strategic considerations.
Brownfield acquisitions are currently dominating deal activity for several compelling reasons. Operating plants commence generating cash flows immediately upon acquisition, possess established grid connections, and benefit from operational histories that facilitate rigorous due diligence and underwriting. Key risks, such as future power price volatility and exposure to regulatory changes, can be analytically forecast, albeit with inherent uncertainties. This provides a more predictable investment pathway.
Greenfield development, conversely, is a more complex undertaking. The multi-year processes of permitting, navigating interconnection queues, and securing equipment, particularly gas turbines, compound execution risk. However, this opportunity can become more compelling when developers can secure long-term contracts for the capacity they intend to build before commencing construction. A prime example of this strategy is data center co-location, where new generation capacity is developed adjacent to a hyperscaler’s facility and contracted directly to provide dedicated, behind-the-meter power. This approach mitigates market price risk and ensures a guaranteed off-taker, de-risking the development significantly.
The Opportunity: A Sector Repricing and the Thermal Renaissance
For institutional allocators, the current landscape presents a large and liquid sector offering diverse risk profiles that has been undergoing a significant repricing in real time. The fundamental question is no longer whether natural gas generation is attractive in principle, as its supply, demand, and pricing fundamentals appear robust and durable. U.S. natural gas generation has demonstrably transitioned from a period of boom, through a bust, and has now returned to a new phase of significant growth. This resurgence, driven by fundamental shifts in demand and energy economics, can be aptly termed the "Thermal Renaissance." This era signifies a renewed appreciation for the critical role of dispatchable, on-demand power in ensuring grid reliability and meeting the escalating demands of a modernizing economy.
The ability of natural gas power plants to provide flexible, baseload, and peaking power is increasingly recognized as essential for complementing intermittent renewable sources and supporting the stability of the grid. As the U.S. continues to electrify its economy and embrace advanced technologies like AI, the need for reliable and affordable power generation is paramount. Natural gas, with its abundant domestic supply and established infrastructure, is uniquely positioned to meet this growing need, offering a compelling investment opportunity for those who understand the evolving energy dynamics.
