Energy pessimists and fossil fuel optimists love to talk about how much juice our grid needs to run, the point being that solar and other renewable sources could never meet such demand, and that the demand is only going to grow.
But how valid is that assumption? We know we can reduce the amount of electricity used for lights. We know appliances are becoming more efficient, and we have simple solutions to cutting the electricity off from unused sockets – all you have to do is buy them.
Ah, say the pessimists, but what about your computers? Even when you get a laptop, as I have, it's still usually plugged into a wall, or has to be recharged from the wall every few hours. And then there are all those huge enterprise server farms to contend with.
Well, the two biggest trends in computing are tablets and clouds, and they are all about reducing that load.
Intel's recent demonstration of that was sort of phony. It's a defensive move, because they're being heavily pressed on the power management front by ARM. But what they want to say in this is that they've heard what the market wants and they want to respond.
What's driving lower energy requirements for iPads and other devices, however, isn't the CPU but flash memory. Replacing hard drives with flash dramatically cuts energy requirements, while at the same time speeding system response times. The more flash prices decline, the lower your PC power bill goes.
When Google revealed its energy use statistics recently most of the headlines were about how much power the company was using. But the headline Google wanted you to read was that they've been carbon neutral for four years – that they've been buying renewable power to run their data centers, and concentrating hard on reducing their use of electricity.
Clouds are a hot technology right now because they let companies meet a “rush to the rail” – a huge spike in traffic or a sudden huge problem that must be gone through – and because they let them consolidate resources. But they also, by their nature, reduce power requirements. Sure, a lot of CIOs don't think about power when they're thinking cloud but when you consolidate server rooms you're retiring the older stuff – and that's the stuff that uses the most power.
No, this doesn't drive power use to zero. But if you have truly wireless clients, using WiFi for communications and solar for power – and when you move server requirements to the cloud, you're dramatically reducing the load on the grid.
Remember. The cheapest renewable energy remains the energy you don't use.