Electric bills for millions of Americans are expected to rise by more than 20 percent in the coming months. The number of power grid blackouts could double by 2030 . Electricity demand in that same time period will skyrocket , far surpassing current levels. It's all part of what the top North American power grid watchdog says is one of the grid's "greatest near-term reliability challenges": the rapid development of data centers, which contain fast-working, electricity-hungry computer systems