It's not always windy outside...

You may have noticed the spinning wind turbine on the front page of this blog. It displays the total amount of energy being produced by Ontario's wind power system every hour of every day.

The graphic -- which is courtesy of Ontario's Independent Electricity Systems Operator (IESO) -- provides a very good example of perhaps the greatest barrier of wind: capacity factor. You'll notice that sometimes several hundred Megawatts (MW) of electricity is produced during the hour and the turbine spins quite quickly, while at other times (like as I write this post) it is less than 100 MW.

Ontario has nearly 1,100 MW of installed capacity of wind power. That basically means it has the potential to produce 1,100 MWh of power each hour for the length of its existence. The trouble, of course, is that this is only theoretical. What the tag might say on the turbine is not what it will produce in reality.

The main reason, of course, is because it is not always windy outside. As a result, sometimes you get the turbines sitting motionless and, despite having nearly 1,100 MW in generating capacity, only producing 35 MW on a day like today. Indeed, I've seen the turbine as Exhibition Place in Toronto lie motionless more than I've seen it moving.

In reality, wind turbines are only about 20-30% efficient from what they are capable of producing. Add to that the inevitable loss of electricity from transmission and distribution and wind doesn't look super hot.

This is not a criticism of wind power, but rather a focus on the need to understand how it works. When its proponents speak about its wide potential, they sometimes exaggerate its true potential, which is often more limited. Indeed, we could toss thousands of turbines over Ontario that would replace the installed capacity of the current electricity generation system. But when it's not windy, the amount of electricity produced would be negligible.

Moreover, because of its variability, wind power alone will not fix our energy problem. And neither will solar because it isn't always sunny and we don't have terrific battery technology. But the combination of these technologies, along with several other renewables and a focus on conservation could fix our system.