The amendment relates to extensions of the validity period of Letters of Permission/Letters of Intent (LOP/LOI) for units such as EOUs, BTPs, EHTPs, and STPs. Under the revised framework, once a unit commences production, the validity of its LOP/LOI may be extended for up to five years at a time as per Para 6.01(c) of the HBP. Additionally, the initial two-year validity period may be extended by one more year for justified reasons, except where specific restrictions apply, such as for oil refinery projects.