More Heat than Light
And a quick observation on this NYTimes story about the amount of electricity used by internet data centers: waste heat isn't really wasteful if it can be put to use. If you have a data center in Minneapolis, then for at least 5 months a year the heat that is generated will not go to waste. It will simply reduce the amount of energy that has to be used in furnaces. (Obviously you have to design the data center properly to make full use of the heat it generates.)
In fact, you can imagine building data centers toward the poles in each hemisphere, and switching back and forth between them with the seasons. I am not sure the southern hemisphere has much population in really cold areas—Buenos Aires isn't nearly as cold as Minneapolis, for example—but in principle you could run these things for very little net energy expenditure.
Although I guess it depends a little on how much energy it takes to send data thousands of miles. But I doubt it is very much.
Another thought. Even in warm areas, people need to heat water for daily use (showers, washing dishes). In an urban area, I wonder if you could use tap water to cool the data center and then feed the warmed-up water into the water heaters in surrounding buildings. Even if you only warm the water by 10 degrees, I bet that would save a fair amount of energy, and realistically maybe you could raise water temperature by 15 or 20 degrees. (Tap water in my apartment is about 70 degrees right now, and I'm guessing you could raise it to over 100 degrees in a data center.) This would only work if you had a lot of demand for hot water in a fairly small geographical space.
But come to think of it, there must be lots of industrial uses for hot water. Breweries use hot water for a lot of applications, and I bet they are not unique. I wonder if you could split the cost of the data center between the company using it (internet company) and the company using the heat (brewery). If water entered your water heater at 110 degrees, I think you would save quite a bit on heating that water to however hot you need it to be.
In fact, you can imagine building data centers toward the poles in each hemisphere, and switching back and forth between them with the seasons. I am not sure the southern hemisphere has much population in really cold areas—Buenos Aires isn't nearly as cold as Minneapolis, for example—but in principle you could run these things for very little net energy expenditure.
Although I guess it depends a little on how much energy it takes to send data thousands of miles. But I doubt it is very much.
Another thought. Even in warm areas, people need to heat water for daily use (showers, washing dishes). In an urban area, I wonder if you could use tap water to cool the data center and then feed the warmed-up water into the water heaters in surrounding buildings. Even if you only warm the water by 10 degrees, I bet that would save a fair amount of energy, and realistically maybe you could raise water temperature by 15 or 20 degrees. (Tap water in my apartment is about 70 degrees right now, and I'm guessing you could raise it to over 100 degrees in a data center.) This would only work if you had a lot of demand for hot water in a fairly small geographical space.
But come to think of it, there must be lots of industrial uses for hot water. Breweries use hot water for a lot of applications, and I bet they are not unique. I wonder if you could split the cost of the data center between the company using it (internet company) and the company using the heat (brewery). If water entered your water heater at 110 degrees, I think you would save quite a bit on heating that water to however hot you need it to be.