 These ESCerts are then eligible for trading at the two Power Exchanges vis-a-vis Indian Energy Exchange (IEX) and Power Exchange India Limited (PXIL) or can also be sold to the designated consumers who are not able to meet their energy savings targets.PAT Scheme also lays down the provision of penalty for those designated consumers who are unable to meet the desired targets after implementation of measures and purchase of ESCerts.PAT Cycle I - The first phase of the PAT Cycle was executed from 2012-13 to 2014–15.