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John Marciano


Washington, D.C.

Image of John Marciano
John Marciano


Washington, D.C.

John is a partner in the global Projects, Energy, Natural Resources and Infrastructure practice, based in our Washington, D.C. office. John’s practice encompasses tax, legal, and commercial advice on energy and infrastructure projects. He also counsels clients in all aspects of the budding unmanned aviation industry, including financing fleets of unmanned aerial systems. His work includes advising on capital-raising and deployment strategies for a wide range of clients, primarily in connection with solar, wind, geothermal, fuel cell and biomass projects.


John is a ranked lawyer in Chambers USA, Nationwide Projects: Renewables and Alternative Energy (2017-2021) and Chambers Global, Projects: Renewables & Alternative Energy (2017-2021). John is also a ranked lawyer in The Legal 500 US, Energy: Renewable/Alternative Power (2017-2020); Project Finance: Advice to Sponsor (2019-2020); Project Finance (2018) and “Leading Lawyer” (2019-2020). John is listed on the kWh Analytics #solar100 and is listed on the A Word About Wind, Top 100 Legal Power List (2018, 2020). John was also honored in the Financial Times’ Most Innovative Law Firms 2015 Report.

News & insights


Publications: 09 JUNE 2021

Japan’s NEDO to unlock the Green Innovation Fund for hydrogen investors

Japan’s Green Innovation Fund  has set up a 2 trillion yen (USD 18 billion equivalent) fund to support projects promoting decarbonisation. 

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Aerial view of a number of solar panels on top of grass

News: 09 JUNE 2021

Allen & Overy advises on one of the world’s largest solar power plants

Allen & Overy advised CIM Group on a 250 MW solar photovoltaic project called Aquamarine being developed in San Joaquin Valley, California. The plant is part of the first phase of the Westlands Solar…

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Publications: 26 MAY 2021

Financing U.S. carbon capture projects - published in Project Finance International

This article, penned by partners Sam Kamyans, John Marciano and associate Sam Guthrie of Allen & Overy’s global Projects, Energy, Natural Resources and Infrastructure practice, provides a guide to…

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Central Park surrounded by buildings and New York city

Publications: 08 APRIL 2021

Biden’s infrastructure plan: big ideas, little detail (so far)

With his newly announced American Jobs Plan, the President has taken the first step toward fulfilling a key campaign promise: to spend more than $2 trillion over eight years to modernize America’s…

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Washington, D.C.

Allen & Overy LLP
1101 New York Avenue, NW
Washington, D.C.

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Admitted: Bar of the District of Columbia


LL.M., Georgetown University Law Center

J.D., University of Pittsburgh School of Law

B.A., Canisius College


Band 1

Chambers USA, Projects: Renewables and Alternative Energy (2017-2020)

Band 1

Chambers Global, Projects: Renewables and Alternative Energy (2017-2020)

Leading Lawyer

The Legal 500 US (2019-2020)

Published Work:

  • John Marciano III (2015) “Renewable Power Tax Credit Reference Guide"