14 cent/kWh

Each day approx. 5 hours peak sun light -> each kW investment yields 70 cent revenue per day. 

13 MW solar farm * 0.7 USD/day= 13*10^3 kW * 0.7 $/(kW*day) = 9000 $/day. 

About 3200000$/year, 64 M$ in 20 years. 

It’s difficult to guess how much they need to build the system (current price for solar panel is about 1$/W excluding battery and charging devices – > 13 M$ + Tesla’s Powerpack 2 system), anyway it’s good to secure revenue (and profit) by such long term deals. 

Source: http://www.businessinsider.de/tesla-unveils-kauai-hawaii-solar-project-2017-3?r=US&IR=T

Tesla is diving into solar energy following its acquisition of SolarCity last November. Tesla is also powering nearly the entire island of Ta’u in American Samoa with solar power and its Powerpacks.

KIUC signed a contract with Tesla to purchase 1 kilowatt-hour of electricity for $.139 over a 20-year time frame.

Before Tesla acquired SolarCity, the two companies agreed in February 2016 to use Tesla’s 52 MWh Powerpack to bring 20 years of power to Kaua’i, so this project has been in the works for quite a bit.

Tesla is powering the Hawaiian island of Kauai with more than 54,000 solar panels and its giant battery packs
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