3. Operators and undertakings established in the Union shall submit a report to the competent authorities of the Member State where the asset is located containing quantification of source-level methane emissions, complemented by measurements of site-level methane emissions, thereby allowing assessment of and comparison with the source-level estimates aggregated by site:
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(a)
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for operated assets, by 5 February 2027 and by 31 May every year thereafter; and
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(b)
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for non-operated assets, by 5 August 2028 and by 31 May every year thereafter, where those assets have not been reported under point (a).
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Before submitting the report to the competent authorities, operators and undertakings shall ensure that the report is assessed by a verifier and includes a verification statement issued in accordance with Article 8.