Algonquin Power & Utilities Corp. 6.875% Fixed-to-Floating Rate Subordinated Notes Series 2018-A is a long-term debt instrument issued by Algonquin Power & Utilities Corp. The notes have a fixed interest rate of 6.875% until October 17, 2078, after which the rate will become floating. This provides investors with a stable income stream and the potential for future interest rate fluctuations.