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Clean Energy

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  • Sophisticated Practice Mission-Driven to Advance Clean Energy Projects, Technologies, and Innovative Models

    Wilson Sonsini has a sophisticated Clean Energy practice purpose-built by experienced, creative attorneys to lead the energy transition through work for our clean energy clients.

  • Representing a Broad Range of Clients in the Energy Industry

    The firm represents emerging clean energy companies, mature enterprises developing large-scale infrastructure projects, and public companies involved in substantial energy transactions and initiatives.

  • Representing Entities Involved in Financing Energy Projects and Ventures

    Wilson Sonsini represents leading strategic investors, private equity and venture firms, energy project investors, and lenders involved in commercializing energy innovations and project finance.

  • A Leading Provider to Innovative Solar Companies

    From the inception of the U.S. solar industry, we have represented leading solar industry companies in their development of groundbreaking deals, business models, and projects. We also represent the lenders and investors that finance them.

As the world's largest, most capital-intensive industry, energy is a vital resource to manufacturing, transportation, and domestic life. Energy also powers the devices and services driving technology, communication, and innovation. Affordable and reliable energy is critical for maintaining well-being, prosperity, security, and social progress. At the same time, the energy industry is undergoing a metamorphosis driven by climate change, technological innovation, and economics: from carbon-intensive to sustainable, from centralized to distributed, from commodity to service, and from vertically integrated to competitive.

Consumers don’t need to be sold on the benefits of moving to smarter, cheaper, and more sustainable ways to use power; they are already there. The majority of Americans see the impacts of climate change in their communities and prioritize the development of alternative energy like solar, wind, and hydrogen over increased fossil fuel production. Clean energy projects and companies need to be developed, built, and financed to meet this demand and the climate imperative.

We are undergoing an energy transition that presents incredible opportunities for innovators and new business models. Wilson Sonsini has built a sophisticated, mission-driven Energy practice anchored by experienced, creative attorneys who represent more than 400 industry clients, including innovative, emerging renewable energy companies, mature enterprises developing and financing large-scale infrastructure projects, and public companies involved in significant energy initiatives. The firm also represents leading strategic investors, private equity firms, energy project investors, and other lenders actively involved in commercializing energy innovations and project finance. Our attorneys are the bridge from opportunity to successful action in this unprecedented era of energy transition.

Areas of Focus

The firm’s Clean Energy practice encompasses the interrelated areas of:

  • Clean energy project development and finance
  • State and federal energy regulation
  • Large commercial and industrial customers’ energy transactions
  • Project finance, tax equity, and joint ventures
  • Sustainability and decarbonization
  • Emerging Companies and Venture Capital
  • Patents and Innovations
  • Private Equity
  • Tax and Tax Equity
  • Finance and Structured Finance
  • Intellectual Property
  • Mergers & Acquisitions
  • Real Estate
  • Regulatory and Compliance
  • Technology Transactions

The close, collaborative relationships we have with our clients give us a direct connection to the vanguard of the clean energy revolution, including those involved with emerging technologies, business models, financing techniques, and regulatory compliance solutions. Our interdisciplinary Energy practice encompasses traditional electric power generators, renewable energy producers, advanced fuels and chemicals companies, and other innovators operating in developing areas such as:

  • Energy efficiency
  • Electric vehicles
  • EV charging infrastructure and other transportation technologies
  • Transmission
  • Distribution
  • Hydrogen
  • Industrial decarbonization
  • Customer service innovations such as SaaS models changing how consumers buy reliable clean energy electric service

Electric Power

Many of our power clients develop and finance modern, major clean electric power projects, including:

  • Utility-scale renewable energy generation plants (e.g., solar, wind, geothermal, biomass, and waste-to-energy)
  • Hydroelectric
  • Nuclear
  • Fuel cell
  • Energy storage facilities

Another set of our energy clients builds and finances behind-the-meter distributed generation assets, community solar projects, energy storage and management systems, energy efficiency equipment and services, and microgrids. These new business models—a response to the rising costs of retail electric power, carbon cost risk, and corporate sustainability initiatives—have led many commercial, industrial, and public entities to focus aggressively on managing load and energy supply on their side of the utility electric meter.

Solar

Wilson Sonsini attorneys pioneered the creation of the U.S. solar industry. Since the mid-2000s—long before solar became the fastest-growing electricity source in America—we worked on groundbreaking solar projects such as:

  • Developed and financed the first utility-scale photovoltaic project in the U.S. (14.2 MW Nellis AFB project, 2007)
  • Developed and financed the first portfolio of commercial and industrial rooftop projects (e.g., MMA Renewable Ventures, Powerlight/SunPower, Recurrent, 2005-08)
  • Negotiated GWs of concentrated solar project power purchase agreements (e.g., Brightsource Energy, 2005-06)

The firm’s energy attorneys co-created the residential solar industry as well, through our work helping Sunrun, SolarCity, and Vivint Solar develop their groundbreaking business models, secure their first tax equity financings, and complete their IPOs and mergers and acquisitions. 

We have also helped industry pioneers create virtual net-metering and community solar subscription model businesses, integrate energy storage into all sizes of solar projects, and secure capital through all manner of tax equity financings, debt, and securitizations. 

In addition, we have helped clients buy and sell hundreds of solar projects and project portfolios as the projects progress from early-stage development to financial close, notice to proceed, placed in service, operation, and post-flip refinancings.

Finally, for solar developers and the solar industry trade group SEIA, we have been the leading energy regulatory advocates at FERC and before state commissions, creating market opportunities for solar companies, dealing with difficult utilities, and preserving rights for independent power under PURPA and the Federal Power Act.

As solar goes from representing a small to a larger share of the electricity supply—and market rules change to reflect this new reality—our attorneys will continue to lay the legal groundwork for clients hastening the energy transition.

Fuels and Chemicals

Just as the electric power industry has undergone radical transformation, the fuels and chemicals industries are in the process of reinventing themselves. From corn-based ethanol to true drop-in fuels and petroleum-based industrial chemicals to bio-based chemicals, advanced fuels and chemicals are a growing force in the marketplace and financial sector.

Wilson Sonsini attorneys have been leaders in these industries for more than a decade, representing companies, investors, lenders, and strategic partners in some of the most significant U.S. transactions. We also represent companies and their financiers in connection with financing, grant, and off-take opportunities with the U.S. Departments of Agriculture, Defense, and Energy, as well as state-level opportunities.

Overview

As the world's largest, most capital-intensive industry, energy is a vital resource to manufacturing, transportation, and domestic life. Energy also powers the devices and services driving technology, communication, and innovation. Affordable and reliable energy is critical for maintaining well-being, prosperity, security, and social progress. At the same time, the energy industry is undergoing a metamorphosis driven by climate change, technological innovation, and economics: from carbon-intensive to sustainable, from centralized to distributed, from commodity to service, and from vertically integrated to competitive.

Consumers don’t need to be sold on the benefits of moving to smarter, cheaper, and more sustainable ways to use power; they are already there. The majority of Americans see the impacts of climate change in their communities and prioritize the development of alternative energy like solar, wind, and hydrogen over increased fossil fuel production. Clean energy projects and companies need to be developed, built, and financed to meet this demand and the climate imperative.

We are undergoing an energy transition that presents incredible opportunities for innovators and new business models. Wilson Sonsini has built a sophisticated, mission-driven Energy practice anchored by experienced, creative attorneys who represent more than 400 industry clients, including innovative, emerging renewable energy companies, mature enterprises developing and financing large-scale infrastructure projects, and public companies involved in significant energy initiatives. The firm also represents leading strategic investors, private equity firms, energy project investors, and other lenders actively involved in commercializing energy innovations and project finance. Our attorneys are the bridge from opportunity to successful action in this unprecedented era of energy transition.

Areas of Focus

The firm’s Clean Energy practice encompasses the interrelated areas of:

  • Clean energy project development and finance
  • State and federal energy regulation
  • Large commercial and industrial customers’ energy transactions
  • Project finance, tax equity, and joint ventures
  • Sustainability and decarbonization
  • Emerging Companies and Venture Capital
  • Patents and Innovations
  • Private Equity
  • Tax and Tax Equity
  • Finance and Structured Finance
  • Intellectual Property
  • Mergers & Acquisitions
  • Real Estate
  • Regulatory and Compliance
  • Technology Transactions

The close, collaborative relationships we have with our clients give us a direct connection to the vanguard of the clean energy revolution, including those involved with emerging technologies, business models, financing techniques, and regulatory compliance solutions. Our interdisciplinary Energy practice encompasses traditional electric power generators, renewable energy producers, advanced fuels and chemicals companies, and other innovators operating in developing areas such as:

  • Energy efficiency
  • Electric vehicles
  • EV charging infrastructure and other transportation technologies
  • Transmission
  • Distribution
  • Hydrogen
  • Industrial decarbonization
  • Customer service innovations such as SaaS models changing how consumers buy reliable clean energy electric service

Electric Power

Many of our power clients develop and finance modern, major clean electric power projects, including:

  • Utility-scale renewable energy generation plants (e.g., solar, wind, geothermal, biomass, and waste-to-energy)
  • Hydroelectric
  • Nuclear
  • Fuel cell
  • Energy storage facilities

Another set of our energy clients builds and finances behind-the-meter distributed generation assets, community solar projects, energy storage and management systems, energy efficiency equipment and services, and microgrids. These new business models—a response to the rising costs of retail electric power, carbon cost risk, and corporate sustainability initiatives—have led many commercial, industrial, and public entities to focus aggressively on managing load and energy supply on their side of the utility electric meter.

Solar

Wilson Sonsini attorneys pioneered the creation of the U.S. solar industry. Since the mid-2000s—long before solar became the fastest-growing electricity source in America—we worked on groundbreaking solar projects such as:

  • Developed and financed the first utility-scale photovoltaic project in the U.S. (14.2 MW Nellis AFB project, 2007)
  • Developed and financed the first portfolio of commercial and industrial rooftop projects (e.g., MMA Renewable Ventures, Powerlight/SunPower, Recurrent, 2005-08)
  • Negotiated GWs of concentrated solar project power purchase agreements (e.g., Brightsource Energy, 2005-06)

The firm’s energy attorneys co-created the residential solar industry as well, through our work helping Sunrun, SolarCity, and Vivint Solar develop their groundbreaking business models, secure their first tax equity financings, and complete their IPOs and mergers and acquisitions. 

We have also helped industry pioneers create virtual net-metering and community solar subscription model businesses, integrate energy storage into all sizes of solar projects, and secure capital through all manner of tax equity financings, debt, and securitizations. 

In addition, we have helped clients buy and sell hundreds of solar projects and project portfolios as the projects progress from early-stage development to financial close, notice to proceed, placed in service, operation, and post-flip refinancings.

Finally, for solar developers and the solar industry trade group SEIA, we have been the leading energy regulatory advocates at FERC and before state commissions, creating market opportunities for solar companies, dealing with difficult utilities, and preserving rights for independent power under PURPA and the Federal Power Act.

As solar goes from representing a small to a larger share of the electricity supply—and market rules change to reflect this new reality—our attorneys will continue to lay the legal groundwork for clients hastening the energy transition.

Fuels and Chemicals

Just as the electric power industry has undergone radical transformation, the fuels and chemicals industries are in the process of reinventing themselves. From corn-based ethanol to true drop-in fuels and petroleum-based industrial chemicals to bio-based chemicals, advanced fuels and chemicals are a growing force in the marketplace and financial sector.

Wilson Sonsini attorneys have been leaders in these industries for more than a decade, representing companies, investors, lenders, and strategic partners in some of the most significant U.S. transactions. We also represent companies and their financiers in connection with financing, grant, and off-take opportunities with the U.S. Departments of Agriculture, Defense, and Energy, as well as state-level opportunities.

Client Highlights
Firm Advises Clearway on Agreements with PacifiCorp for Additional 210 MW of Battery Energy Storage in Utah
On October 9, 2026, Clearway Energy Group (Clearway) announced an additional 210 megawatts (MW) of battery energy storage to its Honeycomb Energy Center fleet in southern Utah, supported by long-term contracts with PacifiCorp. The new storage capacity will help balance supply and demand on Utah’s electrical grid. Wilson Sonsini Goodrich & Rosati advised Clearway on the transaction with PacifiCorp.
Client Highlights
Firm Advises Voltus on Oversubscribed $225 Million Series D
On October 8, 2026, Voltus, a leading distributed energy resource platform, announced it raised $225 million in an oversubscribed Series D financing round. Generation Investment Management led the round alongside co-leads Activate Capital and Vitol. Other investors include Broadscale Group, Climate Investment, NGP, Ajax Strategies, and All Aboard Fund. Wilson Sonsini Goodrich & Rosati advised Voltus on the transaction.
Client Highlights
Wilson Sonsini Advises Type One Energy on $200 Million Series B
On October 6, 2026, Type One Energy, the global fusion power plant developer, announced the successful completion of a $200 million Series B financing round. The financing was co-led by Breakthrough Energy Ventures and Clutterbuck Capital, with participation from Lowercarbon Capital, Siemens Energy Ventures, SiteGround Capital, and other new investors. Wilson Sonsini Goodrich & Rosati advised Type One Energy on the transaction.

The financing supports Type One Energy’s FusionDirect™ technology development program and continued execution of Project Infinity toward the world’s first commercial fusion plant at the Tennessee Valley Authority’s Bull Run site in east Tennessee. It also advances Type One Energy’s fusion industrialization strategy of building best-in-class partnerships across the value chain. This approach—differentiated within the fusion industry—applies the proven energy industry growth model to fusion and brings together the financing, manufacturing, engineering, and operational capabilities required to rapidly deploy commercial fusion at global scale.

The Wilson Sonsini team that advised Type One Energy on the transaction included Michael Danaher, Brett Schulman, Angela Chan, Sophia Kunthara, and Chelsea Gahran.
Client Highlights
Firm Advises DISA Uranium on Asset Purchase with Premier American Uranium
On September 15, 2026, DISA Uranium, an American company built to recover and produce domestic uranium and remediate the nation's legacy uranium sites, announced it has entered into an asset purchase agreement with Premier American Uranium to acquire a portfolio of uranium projects in Colorado. Wilson Sonsini Goodrich & Rosati advised DISA Uranium on the transaction.
Client Highlights
Firm Advises DISA Technologies on Launch of DISA Uranium Corporation
On August 4, 2026, DISA® Technologies, a uranium recovery and production company, announced the formation of DISA Uranium™ Corporation, a new American company built to recover and produce domestic uranium and remediate the nation's legacy uranium sites. In connection with its launch, DISA Uranium has entered into a definitive agreement to acquire IsoEnergy's Utah uranium portfolio of permitted, past-producing mines and projects—giving DISA Uranium a scaled conventional resource base to pair with its proprietary processing technology and the only U.S. Nuclear Regulatory Commission license of its kind. Wilson Sonsini Goodrich & Rosati advised DISA on the transaction.
Client Highlights
Wilson Sonsini Advises Base Power on $1 Billion Series D
On August 3, 2026, Base Power, a battery-powered home energy company based in Austin, Texas, announced it has raised $1 billion in a Series D financing at a $13 billion post-money valuation. The round was led by Ribbit, Addition, Valor Equity Partners, and JPMorganChase's Strategic Investment Group. Wilson Sonsini Goodrich & Rosati advised Base Power on the transaction.
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Insights
Client Highlights
Firm Advises Clearway on Agreements with PacifiCorp for Additional 210 MW of Battery Energy Storage in Utah
On October 9, 2026, Clearway Energy Group (Clearway) announced an additional 210 megawatts (MW) of battery energy storage to its Honeycomb Energy Center fleet in southern Utah, supported by long-term contracts with PacifiCorp. The new storage capacity will help balance supply and demand on Utah’s electrical grid. Wilson Sonsini Goodrich & Rosati advised Clearway on the transaction with PacifiCorp.
Client Highlights
Firm Advises Voltus on Oversubscribed $225 Million Series D
On October 8, 2026, Voltus, a leading distributed energy resource platform, announced it raised $225 million in an oversubscribed Series D financing round. Generation Investment Management led the round alongside co-leads Activate Capital and Vitol. Other investors include Broadscale Group, Climate Investment, NGP, Ajax Strategies, and All Aboard Fund. Wilson Sonsini Goodrich & Rosati advised Voltus on the transaction.
Client Highlights
Wilson Sonsini Advises Type One Energy on $200 Million Series B
On October 6, 2026, Type One Energy, the global fusion power plant developer, announced the successful completion of a $200 million Series B financing round. The financing was co-led by Breakthrough Energy Ventures and Clutterbuck Capital, with participation from Lowercarbon Capital, Siemens Energy Ventures, SiteGround Capital, and other new investors. Wilson Sonsini Goodrich & Rosati advised Type One Energy on the transaction.

The financing supports Type One Energy’s FusionDirect™ technology development program and continued execution of Project Infinity toward the world’s first commercial fusion plant at the Tennessee Valley Authority’s Bull Run site in east Tennessee. It also advances Type One Energy’s fusion industrialization strategy of building best-in-class partnerships across the value chain. This approach—differentiated within the fusion industry—applies the proven energy industry growth model to fusion and brings together the financing, manufacturing, engineering, and operational capabilities required to rapidly deploy commercial fusion at global scale.

The Wilson Sonsini team that advised Type One Energy on the transaction included Michael Danaher, Brett Schulman, Angela Chan, Sophia Kunthara, and Chelsea Gahran.
Client Highlights
Firm Advises DISA Uranium on Asset Purchase with Premier American Uranium
On September 15, 2026, DISA Uranium, an American company built to recover and produce domestic uranium and remediate the nation's legacy uranium sites, announced it has entered into an asset purchase agreement with Premier American Uranium to acquire a portfolio of uranium projects in Colorado. Wilson Sonsini Goodrich & Rosati advised DISA Uranium on the transaction.
Client Highlights
Firm Advises DISA Technologies on Launch of DISA Uranium Corporation
On August 4, 2026, DISA® Technologies, a uranium recovery and production company, announced the formation of DISA Uranium™ Corporation, a new American company built to recover and produce domestic uranium and remediate the nation's legacy uranium sites. In connection with its launch, DISA Uranium has entered into a definitive agreement to acquire IsoEnergy's Utah uranium portfolio of permitted, past-producing mines and projects—giving DISA Uranium a scaled conventional resource base to pair with its proprietary processing technology and the only U.S. Nuclear Regulatory Commission license of its kind. Wilson Sonsini Goodrich & Rosati advised DISA on the transaction.
Client Highlights
Wilson Sonsini Advises Base Power on $1 Billion Series D
On August 3, 2026, Base Power, a battery-powered home energy company based in Austin, Texas, announced it has raised $1 billion in a Series D financing at a $13 billion post-money valuation. The round was led by Ribbit, Addition, Valor Equity Partners, and JPMorganChase's Strategic Investment Group. Wilson Sonsini Goodrich & Rosati advised Base Power on the transaction.
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Affiliated Programs
Developer U - Toronto
We are excited to sponsor Developer U - Toronto, taking place October 28 and 29. Partner Scott Zimmermann will speak on the workshop's welcome panel and partner Jason Slagle will participate in a panel covering FOAK and project finance.
Affiliated Programs
Infocast PowerUp Data Centers - Investment
On October 27, 2026, associate Nadia Senter will moderate the panel “From Grid-Connected to Off-Grid: Impacts on Power Costs and Financing for Near-Term Data Center Power Solutions” at Infocast's PowerUp Data Centers - Investment summit. The summit will bring together capital providers that are financing data centers, powered land, BYOG (bring your own generation), and PowerCo projects to help understand what makes these projects profitable.
Speaking Engagements
ACORE Grid Forum
On October 22, partner Matt Christiansen will speak on the panel "Cost Allocation: An Immovable Object Meets an Unstoppable Force" at the ACORE Grid Forum. This panel will discuss how large loads reshape the grid and who pays as large loads and their cost allocation enter back into the spotlight.
Affiliated Programs
Renewable Energy Markets (REM) 2026
On September 3, Of Counsel Sarah Greenberg will moderate the panel "Fixing the Grid: Policy and Permitting Reform for Siting, Interconnection, and Transmission" at Renewable Energy Markets 2026. The panel will examine the current state of interconnection queues, transmission planning, and permitting frameworks, as well as exploring the policy solutions being proposed to unlock capacity, maintain reliability, and support energy transition.
Affiliated Programs
California Powers Up: Energy & Policy Solutions Summit
Wilson Sonsini are excited to sponsor Advanced Energy United's CA Powers Up: Energy & Policy Solution Summit on August 11th. Join us at the summit where partner Todd Glass will moderate the panel "Navigating the Road Ahead: What's in Store for the Next Governor." The event will provide real answers to California’s most pressing energy questions through thought-provoking panels and breakout sessions. Attendees will have the opportunity to network with policymakers and regulators influencing state energy decisions, as well as executives of companies deploying clean energy solutions. 
Affiliated Programs
Queer Decarbonization Summit West
We are excited to sponsor the Queer Decarbonization Summit West, where partner Scott Zimmermann will be leading a discussion about data centers. The summit is a gathering of LGBTQ+ climate leaders, featuring interactive sessions designed to foster meaningful connections and learning.
View All
Events
Affiliated Programs
Developer U - Toronto
We are excited to sponsor Developer U - Toronto, taking place October 28 and 29. Partner Scott Zimmermann will speak on the workshop's welcome panel and partner Jason Slagle will participate in a panel covering FOAK and project finance.
Affiliated Programs
Infocast PowerUp Data Centers - Investment
On October 27, 2026, associate Nadia Senter will moderate the panel “From Grid-Connected to Off-Grid: Impacts on Power Costs and Financing for Near-Term Data Center Power Solutions” at Infocast's PowerUp Data Centers - Investment summit. The summit will bring together capital providers that are financing data centers, powered land, BYOG (bring your own generation), and PowerCo projects to help understand what makes these projects profitable.
Speaking Engagements
ACORE Grid Forum
On October 22, partner Matt Christiansen will speak on the panel "Cost Allocation: An Immovable Object Meets an Unstoppable Force" at the ACORE Grid Forum. This panel will discuss how large loads reshape the grid and who pays as large loads and their cost allocation enter back into the spotlight.
Affiliated Programs
Renewable Energy Markets (REM) 2026
On September 3, Of Counsel Sarah Greenberg will moderate the panel "Fixing the Grid: Policy and Permitting Reform for Siting, Interconnection, and Transmission" at Renewable Energy Markets 2026. The panel will examine the current state of interconnection queues, transmission planning, and permitting frameworks, as well as exploring the policy solutions being proposed to unlock capacity, maintain reliability, and support energy transition.
Affiliated Programs
California Powers Up: Energy & Policy Solutions Summit
Wilson Sonsini are excited to sponsor Advanced Energy United's CA Powers Up: Energy & Policy Solution Summit on August 11th. Join us at the summit where partner Todd Glass will moderate the panel "Navigating the Road Ahead: What's in Store for the Next Governor." The event will provide real answers to California’s most pressing energy questions through thought-provoking panels and breakout sessions. Attendees will have the opportunity to network with policymakers and regulators influencing state energy decisions, as well as executives of companies deploying clean energy solutions. 
Affiliated Programs
Queer Decarbonization Summit West
We are excited to sponsor the Queer Decarbonization Summit West, where partner Scott Zimmermann will be leading a discussion about data centers. The summit is a gathering of LGBTQ+ climate leaders, featuring interactive sessions designed to foster meaningful connections and learning.
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Ali R. Alemozafar
Partner
San Francisco
Ali counsels clients on patent strategy, prosecution, and diligence for financings, M&A, and IPOs.
  • Patents and Innovations
View Profile
Mark B. Baudler
Partner
San Francisco
Mark is a corporate law veteran, having advised start-ups and mature public companies for more than 25 years.
  • Corporate
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Matthew Christiansen
Partner
Washington, D.C.
Matt Christiansen is a partner in the Washington, D.C., office of Wilson Sonsini Goodrich & Rosati, where he is a member of the energy and climate solutions practice. As a former general counsel at the Federal Energy Regulatory Commission (FERC) and one of the nation’s leading energy regulatory attorneys, Matt represents a diverse range of clients, including independent power producers, hyperscalers and other large energy consumers, and trade associations, both before FERC and in the development of energy and digital infrastructure, such as data centers. 

He has extensive experience with major FERC proceedings involving energy market rules, generator and load interconnection procedures, and the development of electric transmission facilities and natural gas infrastructure. Matt specializes in crafting novel arguments that combine his unparalleled experience at FERC with his understanding of the relevant statutes, regulations, and court precedent, as well as in representing clients at every stage of the regulatory proceeding, including initial pleadings, rehearing requests, and appeals, where necessary.   

Matt also represents clients in negotiations involving the development of both energy infrastructure and digital infrastructure. He has particular experience negotiating FERC-jurisdictional agreements and in applying his experience with the relevant rules and regulations to secure the most favorable outcome for his clients.  

As FERC’s general counsel, Matt oversaw a team of more than 200 lawyers on all manner of adjudicatory and rulemaking matters and was involved in nearly every aspect of the commission’s work, including supervising the its activity in federal courts throughout the country. He has extensive knowledge of FERC rules and regulations under the Federal Power Act and Natural Gas Act, particularly with respect to energy markets and the development of electric transmission facilities and interstate natural gas pipelines.  

Prior to becoming general counsel, Matt was a legal advisor to FERC Commissioner Richard Glick and an attorney-advisor in FERC’s Office of General Counsel. Before joining FERC, Matt served as a law clerk to the Honorable Stephen F. Williams of the U.S. Court of Appeals for the D.C. Circuit and the Honorable Jesse M. Furman of the U.S. District Court for the Southern District of New York.

Matt is a lecturer in law at Yale Law School, where he teaches Advanced State and Federal Electricity Law.            
  • Energy and Climate Solutions
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Robert G. Day
Partner
Palo Alto
Bob represents companies and financial services entities, from innovative entrepreneurs to investment banks and venture capital and private equity firms.
  • Corporate
View Profile
U.P. Peter Eng
Partner
Palo Alto
Peter focuses on strategic patent and innovation counseling for technology start-ups.
  • Patents and Innovations
View Profile
Todd G. Glass
San Francisco
Todd leads a market-leading energy development and finance practice focused on the representation of energy companies, project developers, and investment banks.
View Profile
Ben Hoch
Partner
New York
Ben advises clients on the entire spectrum of corporate finance and financial restructuring matters; he represents companies in a wide array of industries, including tech, energy, electric utility, internet, construction, manufacturing, retail, and aerospace industries.
  • Restructuring
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Andrew D. Hoffman
Partner
Palo Alto
Andrew’s practice focuses on corporate and securities work for companies at all stages of growth, as well as for financial institutions, venture capital firms, and other investors.
  • Corporate
View Profile
Steffen N. Johnson
Partner
Washington, D.C.

Steffen Johnson is an experienced appellate practitioner who co-chairs the firm's national Supreme Court and Appellate practice.

  • Litigation
View Profile
Charlotte J. Kim
Partner
Boston
Charlotte’s practice focuses on global corporate finance with particular expertise in the energy, healthcare, life sciences and biotech, software, retail, manufacturing, aviation, materials science, foodtech, agtech, and tech sectors.
  • Corporate
View Profile
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People
Ali R. Alemozafar
Partner
San Francisco
Ali counsels clients on patent strategy, prosecution, and diligence for financings, M&A, and IPOs.
  • Patents and Innovations
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Mark B. Baudler
Partner
San Francisco
Mark is a corporate law veteran, having advised start-ups and mature public companies for more than 25 years.
  • Corporate
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Matthew Christiansen
Partner
Washington, D.C.
Matt Christiansen is a partner in the Washington, D.C., office of Wilson Sonsini Goodrich & Rosati, where he is a member of the energy and climate solutions practice. As a former general counsel at the Federal Energy Regulatory Commission (FERC) and one of the nation’s leading energy regulatory attorneys, Matt represents a diverse range of clients, including independent power producers, hyperscalers and other large energy consumers, and trade associations, both before FERC and in the development of energy and digital infrastructure, such as data centers. 

He has extensive experience with major FERC proceedings involving energy market rules, generator and load interconnection procedures, and the development of electric transmission facilities and natural gas infrastructure. Matt specializes in crafting novel arguments that combine his unparalleled experience at FERC with his understanding of the relevant statutes, regulations, and court precedent, as well as in representing clients at every stage of the regulatory proceeding, including initial pleadings, rehearing requests, and appeals, where necessary.   

Matt also represents clients in negotiations involving the development of both energy infrastructure and digital infrastructure. He has particular experience negotiating FERC-jurisdictional agreements and in applying his experience with the relevant rules and regulations to secure the most favorable outcome for his clients.  

As FERC’s general counsel, Matt oversaw a team of more than 200 lawyers on all manner of adjudicatory and rulemaking matters and was involved in nearly every aspect of the commission’s work, including supervising the its activity in federal courts throughout the country. He has extensive knowledge of FERC rules and regulations under the Federal Power Act and Natural Gas Act, particularly with respect to energy markets and the development of electric transmission facilities and interstate natural gas pipelines.  

Prior to becoming general counsel, Matt was a legal advisor to FERC Commissioner Richard Glick and an attorney-advisor in FERC’s Office of General Counsel. Before joining FERC, Matt served as a law clerk to the Honorable Stephen F. Williams of the U.S. Court of Appeals for the D.C. Circuit and the Honorable Jesse M. Furman of the U.S. District Court for the Southern District of New York.

Matt is a lecturer in law at Yale Law School, where he teaches Advanced State and Federal Electricity Law.            
  • Energy and Climate Solutions
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Robert G. Day
Partner
Palo Alto
Bob represents companies and financial services entities, from innovative entrepreneurs to investment banks and venture capital and private equity firms.
  • Corporate
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U.P. Peter Eng
Partner
Palo Alto
Peter focuses on strategic patent and innovation counseling for technology start-ups.
  • Patents and Innovations
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Todd G. Glass
San Francisco
Todd leads a market-leading energy development and finance practice focused on the representation of energy companies, project developers, and investment banks.
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Ben Hoch
Partner
New York
Ben advises clients on the entire spectrum of corporate finance and financial restructuring matters; he represents companies in a wide array of industries, including tech, energy, electric utility, internet, construction, manufacturing, retail, and aerospace industries.
  • Restructuring
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Andrew D. Hoffman
Partner
Palo Alto
Andrew’s practice focuses on corporate and securities work for companies at all stages of growth, as well as for financial institutions, venture capital firms, and other investors.
  • Corporate
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Steffen N. Johnson
Partner
Washington, D.C.

Steffen Johnson is an experienced appellate practitioner who co-chairs the firm's national Supreme Court and Appellate practice.

  • Litigation
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Charlotte J. Kim
Partner
Boston
Charlotte’s practice focuses on global corporate finance with particular expertise in the energy, healthcare, life sciences and biotech, software, retail, manufacturing, aviation, materials science, foodtech, agtech, and tech sectors.
  • Corporate
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Related Practices
  • Energy and Climate Solutions
  • Energy Regulation and Competition
  • Project Development and M&A
  • Project Finance and Tax Credit Transactions
  • Sustainability and Decarbonization
  • Technology Transactions
Related Industries
  • Climate and Clean Technologies
Recent Insights
Client Highlights
Firm Advises Clearway on Agreements with PacifiCorp for Additional 210 MW of Battery Energy Storage in Utah
On October 9, 2026, Clearway Energy Group (Clearway) announced an additional 210 megawatts (MW) of battery energy storage to its Honeycomb Energy Center fleet in southern Utah, supported by long-term contracts with PacifiCorp. The new storage capacity will help balance supply and demand on Utah’s electrical grid. Wilson Sonsini Goodrich & Rosati advised Clearway on the transaction with PacifiCorp.
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Client Highlights
Firm Advises Voltus on Oversubscribed $225 Million Series D
On October 8, 2026, Voltus, a leading distributed energy resource platform, announced it raised $225 million in an oversubscribed Series D financing round. Generation Investment Management led the round alongside co-leads Activate Capital and Vitol. Other investors include Broadscale Group, Climate Investment, NGP, Ajax Strategies, and All Aboard Fund. Wilson Sonsini Goodrich & Rosati advised Voltus on the transaction.
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Recent Events
Affiliated Programs
Developer U - Toronto
We are excited to sponsor Developer U - Toronto, taking place October 28 and 29. Partner Scott Zimmermann will speak on the workshop's welcome panel and partner Jason Slagle will participate in a panel covering FOAK and project finance.
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Affiliated Programs
Infocast PowerUp Data Centers - Investment
On October 27, 2026, associate Nadia Senter will moderate the panel “From Grid-Connected to Off-Grid: Impacts on Power Costs and Financing for Near-Term Data Center Power Solutions” at Infocast's PowerUp Data Centers - Investment summit. The summit will bring together capital providers that are financing data centers, powered land, BYOG (bring your own generation), and PowerCo projects to help understand what makes these projects profitable.
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