Economic value retained (NT$ billion)note 2017 56.7 31.5 2018 51.8 18.5 2016 2017 2018 GHG emissions (tons CO2e) (Scope 1 + 2) 57,626.13 58,523.28 57,827.79 Average power consumption per capita (energy use intensity)(kWh) 2,333.61 2,251.25 2,142.60 Installed capacity of solar panels (kWh) 39.6 1,979.12 3,513.8 Note 1: Scope 1 and 2 GHG and power consumption inventories have been conducted in compliance with ISO14064-1 and received external certification; the certification organization was BSI in 2016 and SGS in 2017 and 2018.