A payback analysis can be done very easily: how much does it cost to buy and install a 2MW turbine, how much does it cost to maintain a 2MW turbine each year, and what is the value of the resulting generated electricity?
One source has the cost at around $3 to $4 million to install a 2MW turbine. source
In one year, assuming 20% capacity--which is not atypical in the real world--such a turbine would generate 3,504 mWh. (2mW * 365 * 24 * .2)
Using $50/mWh for the wholesale price of electricity (which I got from scanning the current wholesale prices listed here, with $50/mWh eyeballed from column 'G'), I get a gross profit of $175,200/year for the generated power.
So just with my back-of-the-envelop calculations based on about 5 minutes with Google, the report seems to be bullshit.
Even if the numbers were off by a factor of two--remember, I only spent 5 minutes with Google--I don't see how you can make $116,800 (8 months of generated power) into $3 million (the installation cost quoted above), for large values of $116,800 and for small values of $3 million.
And notice what is missing from my admittedly stupid and simplistic analysis: the cost to run a standby generator, the cost of power storage, or the maintenance cost of the turbine, which I assume like any complex machine requires periodic maintenance.
The problem with research reports like this is that they do their hardest to not talk about the actual costs involved, and instead focus on a very small subset of the costs of construction. In this case it looks like we focused strictly on the power used to construct the turbine, and not the overall material costs, or labor costs. It's the only way I can explain a greater than one order of magnitude gap.