Who writes the trillion-dollar check?

The energy transition and the buildout of a more resilient economy will require tens of trillions in capital over the next two decades to modernise power systems, scale new energy sources, and finance the infrastructure that underpins a lower-carbon, AI-driven world. Venture capital and project finance will play their part, but the institutions that move markets at scale are the world's largest long-term investors. What are they investing in, what's still too risky, and what would unlock the next wave?