BP's average plant performance ratio was acceptable at 78%. BP's power output rose from 17.8 Gigawat hours (GWh) of electricity in 2013 to 27.7 GWh in 2014, and 15.9 GWh in the first half of 2015. The output rose because BP added new capacity during 2013-2015. Based on the total capacity, BP’s solar power projects should generate 30-32 GWh of electricity per year. These solar power projects generated revenue of around Bt200 million per year during 2013-2014, and Bt180 million in the first half of 2015. Earnings before interest, tax, depreciation and amortization (EBITDA) margin are about 90% of total revenue. Given the existing capacity, the solar power projects will generate Bt300-Bt350 million in revenue per annum.