Government can notify any other method :
Notwithstanding anything contained in section 15(1) or section 15(4) of CGST Act, the value of such supplies as may be notified by the Government on the recommendations of the Council shall be determined in such manner as may be prescribed – section 15(5) of CGST Act.
Thus, any other method (like value based on MRP) may be fixed. However, ‘value’ cannot be determined on basis of production capacity.