Safe harbour rules amended to broaden tariff methodology recognition and extend Form 3CEFB compliance timelines for specified domestic transactions. The notification amends the safe harbour rules for specified domestic transactions by inserting 'supply' into the definitional rule, removing a generator-specific limitation, clarifying clause cross-references in tabular provisions, and adding that approval of the methodology for determination of tariff qualifies alongside a determined tariff. It also substitutes a proviso extending the period for furnishing Form 3CEFB for eligible specified domestic transactions (with a specified exclusion), and makes parallel edits to Appendix II Form 3CEFB to reflect the tariff methodology approval reference.