A power purchase agreement is, in essence, a long term contract to acquire electricity from a single facility at a fixed rate — over, say, 20 years. Because the purchases are in bulk, they have the potential to be advantageous from a price standpoint. In general, Google tries to buy power in such a way that the electrons can go straight to its data centers, says Terrell, but that isn’t always possible, given the current setup of the grid.

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