I got this in my Inbox:

Kinsella’s price calculation of 24.6 cents/kWh is hilarious! ­He can’t be serious about just adding the two numbers.

To calculate the combined per kWh cost of the 130 MW project one has to calculate the weighted cost of each component:

Output from the first 90 MW at an agreed starting price of 16 c/kWh with another 40 MW at 8.6c/kWh results in a price of:

(90 MW x $0.16 + 40 MW x $0.086)/(90 MW + 40 MW) = $0.137231 or about 13.7 cents per kWh in the first year.

Simple arithmetic. And LIPA’s Levelized Cost of Energy (LCOE) calculation over 20 years on page 3 of their fact sheet confirms the combined price in the footnote as 14.1 cents/kWh: