As such, Testa leads the environmentalist mobilization in Italy after the Chernobyl disaster, reaching its high in the manifestation of 10 May 1986 with more than 200,000 people.
During this period, Enel was privatized (Europe’s largest-ever IPO of 15 billion Euro) and in 1997 there was the start-up of Wind, the third TLC Italian Company in which Testa was elected member of the Board of Directors.
From 2002 to 2004, he was member of the board of directors of the Riello group, Italian leader company in heating systems and appliances.
From 2002 to 2005, he was member of the advisory board of Carlyle Europe, affiliate of The Carlyle Group (Private Equity), chairman of the board of directors of STA Spa (The Mobility Agency of the City of Rome) and Chairman of the Kyoto Club (non-profit organization whose purpose is the achievement of the objectives set by the Kyoto Protocol).
Testa is a journalist and he contributes to some of the most important daily and weekly Italian newspapers[citation needed].