Herbert Smith Freehills' public law practice is predominantly built around energy regulatory and environmental matters. The firm has won instructions from important mining companies on applications for operating permits, and it defends subsequent challenges brought on environmental grounds. It challenges sanctions imposed by sector regulators for alleged non-compliance in the operation of industrial sites. It often advises on corporate or finance mandates that have important public law implications, with a particularly strong caseload of energy sector deals.

Clients highlight the lawyers' "knowledge of the market and their practical experience in matters of public, administrative and regulatory law, especially in the energy and infrastructure sectors," going on to say: "The public law team carries out a rigorous and detailed analysis of complex legal issues."

"They have a comprehensive knowledge of the legal issues and are dedicated," says another source.

Defended Berkeley Minera España in a series of contentious-administrative appeals filed by environmental groups seeking the withdrawal of permits granted for the operation of a uranium mine in Salamanca.

Iria Calviño has a broad public law practice that spans contentious energy regulatory or environment law matters and advice on the acquisition of heavily regulated businesses. Clients highlight "her deep knowledge in public law matters and her great business skills," further noting: "She has an amazing ability to offer solutions to complex legal problems." Iria Calviño heads the firm's public law team in Spain.

Ignacio Paz is best known for his understanding of the energy sector, which he brings to bear in transactions for the acquisition or financing of renewable energy or oil and gas assets. Clients highlight "his excellent commercial skills and his vast knowledge of the sector." Ignacio Paz also plays a supporting role in a wider range of telecoms or mining sector mandates.