Given their stated goal of having 100% renewable energy for AWS by 2020, you might see some wind or solar projects popping up near their datacenters. They have

Given their stated goal of having 100% renewable energy for AWS by 2020, you might see some wind or solar projects popping up near their datacenters. They have a bunch near their existing facilities already (https://aws.amazon.com/about-aws/sustainability/#progress https://aws.amazon.com/about-aws/sustainability/#progress). Between nearby renewable energy that they have control over, and backup generators they could be OK even if the national grid has issues.