The compulsory user of renewable energy shall perform the obligation by setting up renewable energy power generation equipment, purchasing renewable energy and certificate, or installing energy storage facility within five years from January 1 of the current year when the central competent authority notifies the compulsory installed capacity in accordance with Paragraph 2 of Article 4, or notifies the addition of the compulsory installed capacity in accordance with Paragraph 1 of Article 5. The formula for calculating the capacity and amount of each method to perform the obligation are as follows:1.Installation of renewable energy power generation equipment: Calculation is based on the installed capacity.2. Purchase of renewable energy and certificate: The annual purchase amount required is calculated by multiplying the compulsory installed capacity by the annual amount of electricity sales per kW for the selected category of renewable energy (based on the annual amount of electricity sales measured in kW in the Appendix).3. Installation of energy storage facility: The installed capacity is calculated by multiplying the compulsory installed capacity by the minimum power supply duration of two hours.The capacity and purchase amount specified in the preceding paragraph are calculated based on the renewable energy power generation equipment, authorized by the electricity license, the self-use power generation equipment registration or the renewable energy facility registration document, the energy storage facility approved by the central competent authority, or the purchase of renewable energy and certificate.For those who setting up renewable energy power generation equipment by themselves, the electricity generated shall be used by the compulsory user of renewable energy or other power user who is considered as the same legal person.Those who fail to perform the obligations within the time limit specified in Paragraph 1, the central competent authority shall notify the compulsory user of renewable energy to make improvements within a certain time limit, or perform the obligation by paying monetary substitution. The annual payment amount of the monetary substitution is calculated by multiplying the unperformed compulsory installed capacity by 2,500 kWh /kW, and times the monetary substitution rate.The substitute rate described in the preceding paragraph shall be announced by the central competent authority.