Industry Voice: Being on the right side of change - Renewable energy There’s a transformation happening in financial markets and people’s mindsets, as we transition away from fossil fuels in favour of clean renewable energy sources, writes Thomas Stokes, Investment Director at Aviva Investors. Thomas Stokes, Investment Director, Multi-assets @ Aviva Investors Let me give you two options. The first is ExxonMobil, a well-known oil major, with roots that can be traced back to John D. Rockefeller's Standard Oil. Its operations span every continent except Antarctica. The other is a lesser known company called NextEra, which you may or may not have heard of. They began building a renewable energy business back in the 1990s and have since become the largest producer of wind and solar energy in the US.