Top 30 people: 28. Michael Polsky, CEO, Invenergy

Michael Polsky, who had previously worked in the gas sector, founded Invenergy 13 years ago.

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Developer/utility

The US company works across other renewables and clean energy markets but wind power is its biggest area of development. The group's 4GW wind portfolio is mainly in the US, but stretches to Canada, Poland and the UK. Invenergy claims to be North America's largest independent wind power generation company.