Brookfield's $50B infrastructure fund focused on AI data centers and power is the clearest signal yet that the AI buildout is entering its second phase: physical infrastructure at scale.

The first phase was compute — GPUs, cloud credits, foundation model training. The second phase is infrastructure — power, cooling, physical data centers, network backbone. AI requires enormous amounts of power and physical space that the existing grid was not designed for.

This fund is not a bet on AI software. It is a bet on the physical layer that AI runs on. That is a different kind of risk — and a different kind of return profile.