Total - RE Capacity Contribution (b). 25. 25. 25. 25. 25. 75. 75. (b) Capacity contribution of 50% is currently assumed for Dhofar I & II Wind IPPs. In 2018, the Sultanate of Oman made mandatory the GCC Standard No. (GSO) 2530/2016 (E) on energy efficiency regulations and minimum energy efficiency requirements for air conditioners.