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###### Department of Energy

###### Federal Energy Regulatory Commission

          - [Docket No. ER21-1989-000]

This is a supplemental notice in the above-referenced proceeding of SP Tranquillity Solar Storage, LLC's application for market-based rate authority, with an accompanying rate tariff, noting that such application includes a request for blanket authorization, under 18 CFR part 34, of future issuances of securities and assumptions of liability.

Any person desiring to intervene or to protest should file with the Federal Energy Regulatory Commission, 888 First Street NE, Washington, DC 20426, in accordance with Rules 211 and 214 of the Commission's Rules of Practice and Procedure (18 CFR 385.211 and 385.214). Anyone filing a motion to intervene or protest must serve a copy of that document on the Applicant.

Notice is hereby given that the deadline for filing protests with regard to the applicant's request for blanket authorization, under 18 CFR part 34, of future issuances of securities and assumptions of liability, is June 14, 2021.

                    The Commission encourages electronic submission of protests and interventions in lieu of paper, using the FERC Online links at                     *http://www.ferc.gov.*                     To facilitate electronic service, persons with internet access who will eFile a document and/or be listed as a contact for an intervenor must create and validate an eRegistration account using the eRegistration link. Select the eFiling link to log on and submit the intervention or protests.                

Persons unable to file electronically may mail similar pleadings to the Federal Energy Regulatory Commission, 888 First Street NE, Washington, DC 20426. Hand delivered submissions in docketed proceedings should be delivered to Health and Human Services, 12225 Wilkins Avenue, Rockville, Maryland 20852.

                    In addition to publishing the full text of this document in the                     **Federal Register**                    , the Commission provides all interested persons an opportunity to view and/or print the contents of this document via the internet through the Commission's Home Page (                    *http://www.ferc.gov*) using the “eLibrary” link. Enter the docket number excluding the last three digits in the docket number field to access the document. At this time, the Commission has suspended access to the Commission's Public Reference Room, due to the proclamation declaring a National Emergency concerning the Novel Coronavirus Disease (COVID-19), issued by the President on March 13, 2020. For assistance, contact the Federal Energy Regulatory Commission at                     *FERCOnlineSupport@ferc.gov*                     or call toll-free, (886) 208-3676 or TYY, (202) 502-8659.                

Dated: May 25, 2021.

Debbie-Anne A. Reese,

Deputy Secretary.

[FR Doc. 2021-11472 Filed 5-28-21; 8:45 am]

BILLING CODE 6717-01-P