These days we read and hear more and more about the exponential increases in renewable energy, particularly large wind farms such as those sprouting up on Colorado's front range and eastern plains. Colorado's Amendment 37 requires the state's largest utility companies to produce 10 percent of their energy from renewable sources by 2015. A subsequent legislative action doubled that to 20 percent by 2020. ...This is all great news, right? Not if you are an independent grid system operator, and not if you're expecting all of this large scale wind power to help reduce global warming carbon emissions. Wind power is by nature a notoriously intermittent source of power. Wind simply doesn't blow steadily all of the time. Therefore, the power output of all large scale wind farms goes up and down dramatically throughout the day, regardless of the demand for power on the grid. ...Without energy diversity, the more renewable power we mandate, the more unreliable the grid will become. The laws of physics simply can't be amended.