Storm hardening, electric grid upgrades and new generation underpin request to update electric rates in mid-2027

Rhea-AI Summary

Ameren (NYSE:AEE) unit Ameren Missouri filed with the Missouri PSC to adjust electric base rates in mid‑2027 to recover costs of grid upgrades and new generation. Current base rates stay unchanged until then.

The plan includes storm‑hardening, smart‑grid investments, 400 MW of new generation by end‑2026, a proposed $13/month average residential increase at 1,011 kWh, an income‑eligible discount rate, and projected $21 million in base rate savings over two years from committed data center customers.

Positive

• Projected base rate savings of $21 million over two years from data center load
• Average residential bill impact limited to about $13/month at 1,011 kWh in mid‑2027
• Residential rates about 27% below Midwest and national averages before proposed change
• Grid upgrades and smart tech reportedly prevented 260,000+ customer outages Jan 2025–May 2026
• Planned 400 MW of new generation in service by end of 2026
• $37 million in energy assistance provided last year plus new income‑eligible discount rate

Negative

• Proposed base rate adjustment would raise typical residential bills by about $13/month in mid‑2027
• Major capital spending on grid and generation projects increases costs to be recovered in rates

News Market Reaction – AEE

-3.15%

-3.15% Session close to close

In the Jun 29 session, AEE declined 3.15%, reflecting a moderate negative market reaction.

Data tracked by StockTitan Argus on the day of publication.

Market Context

This announcement highlights substantial grid and generation upgrades, including 400 MW of new capac...

Analysis

This announcement highlights substantial grid and generation upgrades, including 400 MW of new capacity and projected base rate savings of $21 million, alongside customer assistance expansions. Investors should watch the PSC review outcome and execution of the data center growth strategy.

Key Figures

Projected base rate savings: $21 million Bill impact: $13 per month Reference usage: 1,011 kilowatt-hours +5 more

8 metrics

Projected base rate savings $21 million Expected base rate savings over the next two years from large load customers

Bill impact $13 per month Proposed mid-2027 increase for a residential customer using 1,011 kWh

Reference usage 1,011 kilowatt-hours Monthly consumption level used to illustrate the average residential bill impact

Rate discount to averages 27% Ameren Missouri residential rates below Midwest and national averages

New generation capacity 400 megawatts Capacity to be added from three new energy centers by end of 2026

Homes served 70,000 homes Approximate number of homes that new generation could power annually

Annual base rate savings $11 million per year Base rate savings for other customers from committed data center customers

Energy assistance $37 million Energy assistance provided by Ameren Missouri last year

Historical Context

5 past events · Latest: Jun 15 (Neutral)

Pattern 5 events

Date	Event	Sentiment	24h Move	Catalyst
Jun 15	Debt financing	Neutral	+0.8%	Ameren Missouri priced $500M of 5.75% first mortgage bonds due 2056.
May 21	Leadership change	Neutral	+1.1%	Aaron Melda appointed chairman and president of Ameren Missouri.
May 19	Transmission awards	Positive	+1.5%	MISO selected Ameren-led consortium for major Illinois 765-kV projects.
May 15	Dividend declaration	Positive	-3.0%	Board declared $0.75 quarterly cash dividend on common shares.
May 05	Earnings release	Positive	-1.8%	Q1 2026 earnings and EPS rose year over year with guidance reaffirmed.

24h Move is the share-price change in the day after each event; other market factors may also have contributed.

Pattern Detected

Recent news has often seen modestly positive reactions, with occasional divergences where strong earnings or shareholder-friendly actions coincided with short-term pullbacks.

Key Terms

storm-hardened upgrades, dual-fuel operation, liheap

3 terms

storm-hardened upgrades technical

"Rebuilding electric distribution lines with storm-hardened upgrades throughout North St. Louis"

Storm-hardened upgrades are physical improvements made to infrastructure—like power lines, pipelines, cell towers or buildings—to help them survive severe weather such as hurricanes, floods or ice storms. Investors care because these upgrades reduce the chance of service outages, expensive repairs and insurance claims, much like reinforcing a house roof before a hurricane lowers the risk and cost of storm damage and helps protect steady revenue.

dual-fuel operation technical

"upgrades to the Audrain Energy Center to enable dual-fuel operation in extreme weather"

Dual-fuel operation means a machine, vehicle, or power plant can run on two different types of fuel and switch between them as needed, like a car that can use either gasoline or propane. For investors, this flexibility can lower operating costs, reduce fuel supply risk, and make it easier to meet emissions rules, so it can protect profits and reduce regulatory or market-driven surprises.

liheap regulatory

"assist customers with applying for LIHEAP and Weatherization programs to maximize benefits"

Liheap is a government program that provides financial assistance to help low-income households pay their heating and cooling bills. For investors, it highlights the importance of energy affordability and can influence energy demand and utility company performance, especially in regions where many residents rely on such aid. Understanding liheap helps gauge the social and economic factors that can affect energy consumption and related markets.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Proposal reflects improvements already in service, keeps base rates well below the Midwest average and expands customer assistance

Key takeaways:

• Ameren Missouri's base electric rates are not changing until mid-2027.
• Regulators will review grid investments currently benefiting customers.
• The request reflects expected base rate savings of $21 million over the next two years because of future large load customers.
• The filing includes a new income-eligible rate discount that offsets the proposed rate adjustment for our most vulnerable customers.
• Customers can visit AmerenMissouri.com/InvestingInMissouri for more information and resources to help manage their monthly energy bill. 

ST. LOUIS, June 26, 2026 /PRNewswire/ -- Ameren Missouri has filed a request with the Missouri Public Service Commission (PSC) to recover the costs of electric system upgrades and construction of new power generation assets, providing significant reliability and economic benefits to Missouri families and businesses. The PSC will conduct a thorough, 11-month review before new base electric rates take effect in mid-2027.  

"Our responsibility is to provide safe, reliable and affordable service for Missouri families and businesses. Those customers expect the lights to come on every time they flip the switch, especially during the ever more frequent extreme weather," said Aaron Melda, chairman and president of Ameren Missouri, a subsidiary of Ameren Corporation (NYSE: AEE). "The investments we are making today are supporting reliability and strengthening storm resilience. The results are already showing up in fewer outages and better service for the communities we serve."

Melda noted that from January 2025 through May 2026, the installation of storm-resistant electric infrastructure and smart technology helped prevent more than 260,000 customer outages during major storms, reducing service disruptions for customers. 

If approved by regulators, the proposed change in mid-2027 would increase the average residential electric bill with 1,011 kilowatt-hours of usage by about $13 a month.

Today, residential rates for Ameren Missouri customers are approximately 27% below Midwest and national averages and are the lowest among Missouri's investor-owned utilitiesⁱ. Ameren Missouri's residential base rates are expected to remain well below those averages even if this request is approved. 

Key components of the rate adjustment request include:

• Strengthening the grid and investing in smart technology through Ameren Missouri's Smart Energy Plan, which has made the electric system more dependable for families and businesses.
  • Rebuilding electric distribution lines with storm-hardened upgrades throughout North St. Louis and Southeast Missouri after tornadoes and severe weather severely damaged critical infrastructure in spring 2025.
  • Replacing aging infrastructure with new, upgraded power lines with increased capacity, supporting resiliency and providing flexibility to reroute power during an outage while crews safely make repairs.
  • Adding and upgrading substations with smart technology to detect outages faster and restore power more quickly.
  • Upgrading utility poles, many fortified with stronger composite materials, to better withstand severe weather, reduce damage and speed restoration of service.
  • Utilizing Missouri-based suppliers and contractors to help deliver these projects, supporting local jobs and economic development.
• Upgrading energy generation sources to keep dependable power available when customers need it through improvements to the Labadie Energy Center and upgrades to the Audrain Energy Center to enable dual-fuel operation in extreme weather conditions.

"As energy demand grows and weather becomes more extreme, maintaining dependable service for homes and businesses is critical," said Rob Dixon, vice president of regulatory, legislative and external affairs for Ameren Missouri.

• Adding 400 megawatts of new generation to the grid by installing three new energy centers. Once in service by the end of 2026, these diversified power sources will produce enough electricity to power approximately 70,000 homes annually.
• Establishing a new income-eligible discount rate that offsets the proposed adjustment for our most vulnerable customers without increasing costs for everyone, which helps keep energy costs affordable for seniors and families on fixed incomes.

Data Center Projects to Deliver $21 million in Customer Savings

Ameren Missouri's approach to responsibly serving new large load customers is aligned with Missouri Senate Bill 4, one of the strictest laws in the nation when it comes to supplying power to data centers and providing customer protections.

Ameren Missouri is not currently serving any large load data center customers, and the costs of infrastructure improvements required to serve announced data centers are not causing this rate review request. Further, Ameren Missouri customers are expected to see $21 million in projected base rate savings over the next two years, driven by committed data center customers.

"New data centers receive no discounts on their electric rates and are already beginning to pay for infrastructure that benefits all customers, making everyone's rates lower than they otherwise would be," Dixon said. "For example, commitments from new data center customers are expected to deliver about $11 million a year in base rate savings for other customers, showing how growth can make everyone's rates lower than they otherwise would be."

The company's Powering Missouri Growth Plan includes numerous provisions to ensure data centers – not other customers – pay for the costs to serve them, requiring they pay upfront 100% of all costs associated with hooking up to the energy grid, among other protections.

Help is Available

Ameren Missouri is committed to helping customers manage energy costs by connecting them with meaningful financial assistance, flexible payment options and community-based support when they need it most. As families manage household costs, Ameren Missouri continues to make energy assistance available. Last year, Ameren Missouri provided $37 million in energy assistance.

"Any changes in electric rates matter to our customers, and we're working to keep costs as low as possible while continuing to provide the safe, reliable service our customers depend on every day," said Joe Solari, vice president of customer experience at Ameren. "Our proposed new income-eligible discount rate would offset this proposed adjustment for our most vulnerable customers. We also want customers to know that help is available. Anyone who may need assistance should contact us to learn about expanded eligibility requirements for energy assistance grants, flexible payment options and tools that can help manage energy use."

Ameren Missouri partners with local Community Action agencies to offer programs such as Dollar More, which provides qualified customers up to $600 per calendar year in bill assistance. These agencies can also assist customers with applying for LIHEAP and Weatherization programs to maximize benefits. Ameren Missouri's Keeping Cool program provides summer bill credits for eligible seniors, the disabled, and families with medical challenges or children under age 5. The Keeping Current program provides eligible customers with bill credits when they make on-time monthly payments. Information about eligibility and other assistance options is available at AmerenMissouri.com/EnergyAssistance.

For customers looking for more control and peace of mind when it comes to their energy bills, Ameren Missouri offers a range of tools and support programs, including Rate Options and the Budget Billing Rollover plan. This free option makes monthly bills more predictable by helping customers avoid seasonal bill spikes through more consistent payments throughout the year. Customers can explore Billing Options to learn more about available tools and programs that may help them manage their energy costs.

About Ameren Missouri

Ameren Missouri has been providing electric and gas service for more than 100 years, and the company's electric rates are among the lowest in the nation. Ameren Missouri's mission is to power the quality of life for its 1.3 million electric and 135,000 natural gas customers in central and eastern Missouri. The company's service area covers 60 counties and more than 500 communities, including the greater St. Louis area. For more information, visit Ameren.com/Missouri or follow us at @AmerenMissouri or Facebook.com/AmerenMissouri.

ⁱ Edison Electric Institute Typical Bills and Average Rates Report through June 30, 2025.

View original content:https://www.prnewswire.com/news-releases/storm-hardening-electric-grid-upgrades-and-new-generation-underpin-request-to-update-electric-rates-in-mid-2027-302812286.html

SOURCE Ameren Missouri

FAQ

What electric rate changes did Ameren Missouri (NYSE:AEE) request for mid-2027?

Ameren Missouri requested a base electric rate adjustment that would start in mid‑2027. According to Ameren Missouri, the proposal would raise a typical residential bill using 1,011 kWh by about $13 per month while recovering grid and generation investment costs.

How will Ameren Missouri’s 2027 rate request affect average residential bills for AEE customers?

The filing targets about a $13 monthly increase for a customer using 1,011 kWh. According to Ameren Missouri, this change would begin in mid‑2027, after an 11‑month Missouri PSC review, while residential rates are expected to remain well below Midwest and national averages.

What grid and generation investments support Ameren Missouri’s AEE rate case filing in June 2026?

The filing covers storm‑hardening, smart‑grid upgrades, and new generation projects. According to Ameren Missouri, investments include rebuilding damaged lines, upgrading substations and poles, and adding 400 MW of new generation via three energy centers expected online by the end of 2026.

How do data centers impact Ameren Missouri’s AEE electric rate proposal and customer bills?

Ameren Missouri says data center investments are not causing the current rate request. According to Ameren Missouri, committed data center customers are expected to deliver $21 million in projected base rate savings over two years, including about $11 million per year in savings for other customers.

What assistance programs and discounts accompany Ameren Missouri’s 2027 rate adjustment request?

The company is proposing a new income‑eligible discount rate designed to offset the adjustment for vulnerable customers. According to Ameren Missouri, it also provided $37 million in energy assistance last year and offers programs like Dollar More, Keeping Cool, and Keeping Current.

How have Ameren Missouri’s storm-hardening projects benefited AEE customers before the 2027 rate change?

Storm‑hardening and smart‑grid work have already reduced outages for many customers. According to Ameren Missouri, from January 2025 through May 2026 these upgrades helped prevent more than 260,000 customer outages during major storms, supporting improved reliability ahead of the proposed rate adjustment.

Are Ameren Missouri’s AEE residential electric rates still competitive under the June 2026 request?

Ameren Missouri reports its current residential rates are about 27% below Midwest and national averages. According to Ameren Missouri, residential base rates are expected to remain well below those averages even if the mid‑2027 base rate adjustment is approved by Missouri regulators.