Matt, in another thread on EnergyCentral I emphasized the importance of distinguishing the concepts of energy and power. You present another example here of how critically important it will be for making decisions going forward.

A source of confusion is conflicting definitions for the term "capacity" -  one exploited by renewables advocates to boost the value of their chosen technology. Whoever did it first should face a firing squad, but what's done is done (a satisfactory substitute might be exiling him/her to a remote island without internet access).

Here, capacity is deceptively used to represent how much power a source can possibly produce, vs. how much average power it will produce over a given interval of time. The statement:

"A total of 10.9 GW of wind capacity is scheduled to come online in 2019."

is more accurately stated:

"Wind facilities which can output a maximum of 10.9 GW of power are scheduled to come online in 2019."

Obviously, it's deceptive to compare maximum power with average power. Comparing average power, gas is 100% more useful than wind for delivering energy - the stuff that makes our lives better (nuclear is 200% more useful, solar is 33% less useful).

A more accurate metric would apply each source's capacity factor before comparing additions together. In that case, 2019 additions will be:

Wind: 3.3 GW
Gas: 4.9 GW
Solar: .9 GW

Pointing out new gas will be providing 14% more average power than new wind and solar drives renewables advocates nuts, but they were pretty nuts to begin with.

Of the planned natural gas capacity additions, 60% will occur in Pennsylvania, Florida, and Louisiana.

In all three states coal is on its last legs. NGCC plants are replacing this coal.  In PA coal generation has dropped 43TWh in the last 5 years and coal in FL is down 22TWh in last 4 years.  CO2 declines.

Although FL should be commended for replacing coal, it has been way too slow in moving to solar. That is starting to change.  Solar is starting to help NG in replacing the coal in FL and therefore coal decline will accelerate. Coal in FL should be gone by the mid 20s. 

Once the coal is gone, Solar in FL will eat into NG share.  CO2 declines.