Google is ahead of the game here. Other tech companies also are moving to renewables but they're not at 100% yet (IIRC). The key point is that as cloud computing becomes commoditized and people build tools to quickly transfer from one cloud provider to another, the profit margin will become smaller and smaller until energy costs dominate the cost to provide a service. It is already the case that a machine will use more in energy costs than its capital cost over its lifetime.

So, whoever has the cheapest power will be able to provide cheapest services, or charge more for capacity located in more energy-expensive regions (for latency).