Yet the twisters had not touched the Redstone Arsenal base — they had damaged the power grid dozens of miles away.

With blackouts growing in regularity — due to ageing, overloaded grids and increasingly frequent extreme weather events — the US military understands that its critical electricity supply is vulnerable.

The Department of Defense (DoD) envisages renewables — and technologies that can help leverage them, such as advanced microgrids and storage — playing a key part in its comprehensive strategy to increase security of power supply, and reduce energy costs and consumption.

And