ST. LOUIS, Missouri, Feb 27, 2026, 06:34 CST
- Ameren has priced $400 million in senior notes at 5.00%, set to mature in 2036. The company plans to close the deal on March 4.
- Ameren Missouri’s Union Electric unit is looking to raise $900 million through first mortgage bonds, according to a filing. The notes will mature in 2036 and 2056, with settlement lined up for Feb. 27.
- The proceeds will be used to pay down short-term debt and help fund capital projects coming up soon.
Ameren Corp has set the price for its $400 million public sale of 5.00% senior notes due 2036, the utility holding company said Thursday, with the notes going at 99.802% of their face value. The transaction is slated to close March 4.
Timing here is no accident. Ameren is locking in longer-term financing while juggling some looming maturities and a capital plan that’s accelerating cash needs—this, despite being a regulated utility that typically recoups spending via customer rates spread across years.
Utilities tend to pivot fast between short-term debt and locking in long-term bonds when the window is there. The playbook: grab today’s fixed coupons, extend maturities, and limit the risk of having to roll commercial paper if rates spike.
Ameren intends to put the net proceeds toward general corporate needs, with some of the money going to pay down short-term debt. The company pointed to short-term borrowings that were used to refinance Ameren’s 3.65% senior notes due 2026, which are coming up for maturity.
The company said BNY Mellon Capital Markets, J.P. Morgan, RBC Capital Markets, U.S. Bancorp Investments, and Wells Fargo Securities are serving as joint book-running managers for the senior notes.
Union Electric Company, operating as Ameren Missouri, is separately moving ahead with a $900 million bond sale, according to a newly filed prospectus supplement. The deal splits evenly: $450 million in 4.80% first mortgage bonds maturing 2036, and another $450 million at 5.55% due in 2056. Pricing lands at 99.926% and 99.619%. Settlement in New York is slated for around Feb. 27.
Union Electric expects net proceeds of roughly $889.4 million, after deducting underwriting discounts and other expenses tied to the offering. According to the filing, the funds are earmarked for refinancing short-term debt or covering upcoming capital spending. The document lists about $938.7 million in commercial paper outstanding as of Feb. 20, maturing in five days or less, with a weighted average interest rate of 3.83%.
First mortgage bonds, essentially utility-backed debt with a direct claim on assets, put bondholders ahead of general creditors if something goes wrong. According to Union Electric, these new bonds follow its mortgage indenture and establish a first lien on almost all company properties, joining the ranks of its other first mortgage bonds.
The prospectus lays out some potential headaches for bondholders, especially when markets get choppy. Both the 2036 and 2056 bonds can be called early under a formula tied to Treasury rates, plus a spread: that’s 12.5 basis points for the 2036s, 15 for the 2056s. One basis point represents 0.01 percentage point.
The plan isn’t without pitfalls. Simply Wall St flagged worries from analysts about Ameren’s debt coverage—operating cash flow looks thin against those obligations, and a hefty capital plan could stretch leverage if things like project schedules, allowed returns, or tax credits don’t break Ameren’s way. The SEC filing points out something else: these are fresh bonds, lacking an established trading market, and there’s no plan to list them.
St. Louis-based Ameren delivers electricity to roughly 2.5 million customers, plus natural gas to over 900,000, through its regulated subsidiaries in Missouri and Illinois, the company said.
