80 solar panels rated 500 watts each make up the 2400 sq ft Greenhouse Roof. 

6 hrs of sunlight x 500 =3000 watts =3 kWh x 80 solar panels=240 kwh per day x 365=87,600 kwh annually. 

According to Google: "PREPA Puerto Rico Electric Power Authority Offer bundled service residential rate of 22.96 cents/kWh." 22.96 x 87,600 kWh=$20,112.96 annually. Click here.