Quinbrook Infrastructure Partners is a specialist investment manager focused exclusively on lower carbon and renewable energy infrastructure across the United States, United Kingdom, and Australia. As a dedicated energy transition investor, Quinbrook has established itself as a pioneer in developing and deploying innovative infrastructure solutions that accelerate the shift to cleaner, more sustainable energy systems. The firm manages several billion dollars in assets and has developed a reputation for taking an industrial, value-add approach to infrastructure investment that combines financial expertise with deep operational and engineering capabilities.
Founded in 2015 and headquartered in London with additional offices in New York, Houston, and Brisbane, Quinbrook employs a team of power industry professionals who collectively bring decades of experience in energy infrastructure investment and operations. The firm’s investment and asset management approach is distinguished by its willingness to originate, develop, construct, and operate infrastructure projects from conception through commercial operation, rather than simply acquiring existing assets. This vertically integrated approach allows Quinbrook to capture value throughout the entire project lifecycle and to bring truly innovative solutions to market.
What Does Quinbrook Infrastructure Partners Do?
Quinbrook Infrastructure Partners specializes in identifying, developing, financing, constructing, and operating renewable energy and energy transition infrastructure assets. The firm’s investment activities span the full technology landscape of the energy transition, including utility-scale solar photovoltaic projects, onshore wind developments, battery energy storage systems, renewable natural gas facilities, grid support infrastructure, and data center power solutions. Quinbrook takes a “creator” approach to investing, actively originating and developing projects rather than solely acquiring operational assets, which allows the firm to address critical gaps in energy infrastructure and capture enhanced returns.
The firm’s portfolio includes some of the largest and most innovative renewable energy projects in its target markets. In the United States, Quinbrook has developed major solar-plus-storage projects including the Gemini Solar + Storage project in Nevada, which spans thousands of acres and sets benchmarks for scale and efficiency. In the United Kingdom, the firm developed and constructed Cleve Hill Solar Park, which at the time of completion was the UK’s first Nationally Significant Infrastructure Project in the solar sector and the largest solar installation in the country. In Australia, Quinbrook is developing several large-scale battery energy storage systems, including projects in Queensland that represent critical grid infrastructure investments.
Beyond renewable generation and storage, Quinbrook is expanding into adjacent areas including grid support infrastructure such as synchronous condensers, industrial decarbonization projects, renewable fuel production, and critical minerals development. The firm has also recently established platforms focused on data center infrastructure to support the growing energy demands of artificial intelligence and digital technologies. Through its investments, Quinbrook has collectively deployed billions of dollars in equity capital into energy infrastructure assets representing tens of billions in total transaction value.
When Was Quinbrook Infrastructure Partners Founded?
Quinbrook Infrastructure Partners was founded in 2015 by David Scaysbrook and Rory Quinlan, two seasoned energy infrastructure investment professionals who had previously worked together at other leading infrastructure investment firms. The founding of Quinbrook represented an opportunity to create a specialized platform focused exclusively on the energy transition at a time when many traditional infrastructure investors were still primarily focused on conventional energy and transportation assets. The founders recognized that the global energy transition would create substantial infrastructure investment opportunities and that a specialist manager with deep industry expertise could capture superior returns.
The firm’s three decades of collective experience in the clean energy business through its founders has shaped Quinbrook’s industrial pedigree and operational DNA, with a long-term, authentic commitment to sustainable asset creation and business building. From its inception, Quinbrook has maintained a focus on being more than just a financial investor—the firm positions itself as an industrial infrastructure developer and operator that happens to be backed by institutional capital. This differentiated approach has allowed Quinbrook to establish itself as a go-to partner for complex, large-scale renewable energy projects that require technical expertise, development capabilities, and patient capital.
Who Owns Quinbrook Infrastructure Partners?
Quinbrook Infrastructure Partners is a privately held, independent investment management firm owned by its founders and management team. As a partnership structure, the firm is primarily owned by Co-Founders David Scaysbrook and Rory Quinlan, along with other senior members of the investment and management teams who have equity stakes in the business. This ownership structure aligns the interests of the firm’s leadership with those of its investors, as the partners’ wealth is directly tied to the long-term performance of Quinbrook’s investment funds.
The independent, partner-owned structure provides Quinbrook with several advantages. First, it allows the firm to maintain a long-term investment orientation without pressure from external financial sponsors or the short-term considerations that can affect publicly traded asset managers. Second, it preserves the firm’s ability to make patient, strategic investments in complex development projects that may take years to reach commercial operation. Third, it ensures continuity of the firm’s investment philosophy and operational approach, as key decision-makers have strong incentives to preserve the firm’s reputation and relationships for the long term.
While Quinbrook is owned by its partners, the firm’s investment funds are capitalized by institutional investors including pension funds, insurance companies, endowments, and sovereign wealth funds from around the world. These limited partners provide the capital that Quinbrook deploys into infrastructure projects, while the firm’s management team makes investment decisions and manages the day-to-day operations of portfolio companies.
Who Is The CEO of Quinbrook Infrastructure Partners?
As of mid-2025, Brian Restall serves as the CEO of Quinbrook Infrastructure Partners, having transitioned into this newly created role from his previous position as Australian Regional Leader. Restall assumed overall leadership responsibility for the management of all Quinbrook regional teams based in North America, Europe, and Australia. He has worked for Quinbrook since its founding in 2015 and had collaborated with the founders in their predecessor investment management roles since 2011. Restall brings more than 28 years of experience in energy-related infrastructure investments and operating businesses across Australia, the United States, Europe, and Africa.
The co-founders, David Scaysbrook and Rory Quinlan, continue to serve as Co-Founders and Managing Partners of the firm. Scaysbrook and Quinlan remain actively involved in setting strategy and overseeing major investment decisions while working alongside the expanded leadership team. In announcing Restall’s appointment, Scaysbrook noted that the new leadership structure was designed to empower the team to lead Quinbrook into its second decade and beyond, reflecting the firm’s growth and evolution since its 2015 founding.
In addition to Restall’s appointment as CEO, Quinbrook has made other senior leadership appointments to support its growth, including Giulia Siccardo as Managing Director and Regional Leader for the US. Siccardo joined from the U.S. Department of Energy where she served as the first-ever Director of Manufacturing & Energy Supply Chains, overseeing the deployment of tens of billions of dollars in energy infrastructure investments. Prior to her government service, she spent over a decade as a partner at McKinsey & Co.
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