Exhibit 99.1 Iris Energy Reports Full Year FY23 Results SYDNEY, AUSTRALIA, September 13, 2023 (GLOBE NEWSWIRE) -- Iris Energy Limited (NASDAQ: IREN) (together with its subsidiaries, “Iris Energy” or “the Company”), a leading owner and operator of institutional-grade, highly efficient Bitcoin mining data centers powered by 100% renewable energy, today reported its financial results for the full year ended June 30, 2023. All $ amounts are in United States Dollars (“USD”) unless otherwise stated. “FY23 was a t ...