Exhibit 99.1 Telesat Reports Results for the Quarter and Twelve Months Ended December 31, 2022 OTTAWA, CANADA - March 29, 2023 –Telesat (NASDAQ and TSX: TSAT), one of the world’s largest and most innovative satellite operators, today announced its financial results for the three-month and one-year periods ended December 31, 2022. All amounts are in Canadian dollars and reported under International Financial Reporting Standards (“IFRS”) unless otherwise noted. “I am pleased to report that we outperformed our ...