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This action will allow owners or operators of electric utility steam generating units (EGUs) to continue to provide temporarily certain reports in portable document file (PDF) format via a single electronic reporting system for Mercury Air Toxic Standards (MATS) data submissions and to use corrected procedures and quality assurance requirements associated with mercury (Hg) relative accuracy test audits (RATAs). Temporary submissions are allowed through June 30, 2018, and this extension will allow the EPA the necessary time to develop, implement, and test the code necessary so that all MATS reports required to be submitted electronically can be submitted using the Emissions Collection Monitoring Plan System (ECMPS) Client Tool. This action reduces regulatory burden for EGU owners or operators because the deadline extension keeps them from having to submit their data via two separate electronic reporting systems.