; and (II) identify any gaps in the test data. (ii) Plan Not later than 180 days after identifying gaps in test data under clause (i), the Secretary, in coordination with the heads of Sector-Specific Agencies and in consultation with the Secretary of Defense and the Secretary of Energy, shall use the sector partnership structure identified in the National Infrastructure Protection Plan to develop an integrated cross-sector plan to address the identified gaps. (iii) Implementation The heads of each agency identified in the plan developed under clause (ii) shall implement the plan in collaboration with the voluntary efforts of the private sector, as appropriate. (e) Rule of construction Nothing in this section may be construed to affect in any manner the authority, existing on the day before the date of enactment of this subsection, of any other component of the Department or any other Federal department or agency, including the authority provided to the Sector-Specific Agency specified in section 61003(c) of division F of the Fixing America’s Surface Transportation Act ( 6 U.S.C. 121 note), including the authority under section 215 of the Federal Power Act ( 16 U.S.C. 824o ), and including the authority of independent agencies to be independent. . (c) National essential functions (1) Definition In this subsection, the term national essential functions means the overarching responsibilities of the Federal Government to lead and sustain the Nation before, during, and in the aftermath of a catastrophic emergency, such as an EMP or GMD that adversely affects the performance of the Federal Government. (2) Updated operational plans Not later than March 20, 2020, each agency that supports a national essential function shall prepare updated operational plans documenting the procedures and responsibilities of the agency relating to preparing for, protecting against, and mitigating the effects of EMPs and GMDs. (d) Benchmarks Not later than March 26, 2020, and as appropriate thereafter, the Secretary of Energy, in