Utility program deep dive · Missouri
Ameren Missouri residential VPP economics
Where the rate choice is the program: Smart Saver’s 5.3-times peak spread, Peak Time Savings for thermostats and EVs, and whether a home battery pays back.
VPP Economics has no affiliation with, sponsorship from, or endorsement by any utility, aggregator, platform, or device maker named here.
The short answer
- At Ameren Missouri, the rate choice is the program. No battery program is open, but the Smart Saver rate charges 40.51¢ per kWh from 3 to 7 p.m. on summer weekdays and 7.67¢ overnight, a spread of about 5.3 times, the steepest we model.
- A battery earns every weekday without enrolling. Moving 10 kWh a day out of the summer peak is worth about $272 a year, and the two winter peaks, 6–8 a.m. and 6–8 p.m., add about $241. A Powerwall 3 recovers about 30% of its cost in ten years.
- Thermostats and EVs are paid by program. Peak Time Savings pays $50 plus $25 a year for a thermostat, and Peak Time Savings EV pays $50 plus $100 a year for managed charging through the Optiwatt app.
- Solar homes face a catch. Net-metering customers are not eligible for Peak Time Savings, and excess solar earns only 3.39–3.84¢ per kWh, so storing solar for the Smart Saver peak is worth far more than exporting it.
Who does what
Ameren Missouri serves about 1.2 million electric customers in eastern and central Missouri, including St. Louis. Missouri has no retail choice, so it owns generation and wires and sells all power at regulated rates. It sits in Zone 5 of MISO, the Midcontinent Independent System Operator. The Missouri Public Service Commission (PSC) approves its rate sheets and its efficiency and demand response plans under the Missouri Energy Efficiency Investment Act (MEEIA) (Ameren’s MEEIA filing).
Three tracks
Where the money comes from, who sets the rules, and what reaches a household.
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What makes this territory different: the rate choice is the program
Every deep dive on this site has one feature that changes how its economics read. At Ameren Missouri, it is that a household’s rate decides almost all of what flexibility is worth. Ameren offers five residential options, all with the same $9 customer charge (Ameren rate options). On the default Anytime rate, summer power costs a flat 15.6¢ and a battery loses money on every cycle. On Smart Saver, the same kWh is worth 40.51¢ from 3 to 7 p.m. on summer weekdays and 7.67¢ from 10 p.m. to 6 a.m. (rate sheet 54).
Same battery, five rates
What one kWh shifted from off-peak to the peak is worth on each Ameren Missouri rate, after 10% round-trip losses.
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Smart Saver has a winter shape too: peaks from 6 to 8 a.m. and 6 to 8 p.m. at 21.69¢, against 6.35¢ overnight. Ultimate Saver pairs a 34.13¢ summer peak with a demand charge of $9.28 per kW in summer and $3.83 in winter on the highest hour between 6 a.m. and 10 p.m. For a home with an EV, a heat pump or a battery, picking the rate is worth more than any program enrollment.
The catch is for solar homes. Peak Time Savings excludes net-metering customers (Peak Time Savings page), and excess solar is credited at avoided fuel cost, 3.84¢ in summer and 3.39¢ in winter (net metering sheet). Ameren’s solar rebate ended on December 31, 2023 (Ameren solar page).
What each device earns
Programs by device
Ameren Missouri residential programs and rates, November 2026.
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Smart thermostat
$50 to enroll and $25 a year; events of up to four hours; not open to net-metering customers.
EV charging
$50 to enroll and $100 a year through the Optiwatt app, which shifts charging away from peaks.
Home battery
No program; the rate pays 40.51¢ against 7.67¢ for each kWh moved out of the summer peak.
Water heater
No connected water heater program is listed for Ameren Missouri residential customers.
Both programs run under MEEIA. Ameren filed in September 2026 to continue its efficiency programs from January 2027 through December 2028 and demand response through May 2029 (September 2026 MEEIA extension).
Can a home stack programs?
Stacking at Ameren Missouri is mostly about pairing a rate with a program. With no battery program, the rate and the thermostat or EV credit are the whole stack.
Five combinations
Which Ameren Missouri payments can be combined for one home, and why.
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Stacking needs care, depending on M&V methodology. Smart Saver needs no verification: the meter reads each hour and bills it. Peak Time Savings counts thermostat events, and the EV program reads charging data through the app. The two programs measure different devices, so they stack cleanly; the rule against net-metering homes is an eligibility line, not a measurement one.
Case study: does a battery pay back?
Take one hypothetical home on Smart Saver with a new Powerwall 3 at $15,647, the cost our Residential VPP Calculator uses. It charges overnight at the off-peak price and delivers 10 kWh into the peak on each weekday: 3 to 7 p.m. on 85 summer weekdays, and the two winter peaks on 165 winter weekdays.
Ten-year cash test
Ten years of rate savings as a share of the battery’s installed cost.
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Smart Saver recovers about 30%. The summer peak is worth about $272 a year and the winter peaks about $241. On Overnight Saver, the same battery recovers about 15%. On Anytime it recovers nothing.
The rate helps everything else more. The same spread that pays a battery about $500 a year rewards a heat pump or EV that avoids 3–7 p.m. with no equipment cost at all. A battery here is mainly a backup purchase with a strong rate behind it.
Own, borrow or enroll
Money in and out of the household, then cumulative cash over ten years.
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Where Ameren Missouri goes next
Ameren is adding storage on the utility side: the PSC approved a battery at its Millcreek site in October 2026 (Millcreek project page). Customer batteries have no program yet, and the MEEIA extension runs demand response through May 2029.
The future of VPP to grow at scale will depend on multiple assets in unison at any given site: thermostat, EV charger, battery and solar, dispatched together and measured as one resource. In Missouri, Smart Saver already prices every device’s flexibility hour by hour; what is missing is a program that pays a battery or solar home for answering the grid.
The MEEIA extension
Decides whether Peak Time Savings and its EV program continue past 2027.
A battery program
None is open; Millcreek shows Ameren building storage itself.
Net-metering eligibility
Opening Peak Time Savings to solar homes would add thousands of thermostats.
Frequently asked questions
Does Ameren Missouri pay for home batteries?
No battery program is open. A battery earns through the Smart Saver time-of-use rate, which charges 40.51¢ per kWh from 3 to 7 p.m. on summer weekdays and 7.67¢ overnight.
What does Ameren Missouri Peak Time Savings pay?
$50 to enroll a smart thermostat and $25 a year. Net-metering customers are not eligible. Peak Time Savings EV pays $50 plus $100 a year for managed charging through the Optiwatt app.
What is the Ameren Missouri Smart Saver rate?
A time-of-use rate with a summer peak from 3 to 7 p.m. on weekdays at 40.51¢ per kWh, an off-peak price of 7.67¢ from 10 p.m. to 6 a.m., and winter peaks from 6 to 8 a.m. and 6 to 8 p.m. at 21.69¢.
Does a home battery pay for itself at Ameren Missouri?
Not on bill savings. On Smart Saver, a Powerwall 3 recovers about 30% of its cost in ten years on our assumptions. Backup power is the main reason to buy one.
What does Ameren Missouri pay for excess solar?
Net-metering excess is credited at avoided fuel cost: 3.84¢ per kWh in summer and 3.39¢ in winter.
Related: the Ameren Missouri C&I deep dive, the Ameren Illinois deep dive for its sister utility across the river, and the Consumers Energy residential deep dive for another MISO utility. To run other equipment, use the Residential VPP Calculator.
Method and caveats
An independent, hypothetical analysis for homeowners, renters, program managers, installers and other readers in Ameren Missouri territory. Terms checked November 5, 2026.
Case study: a Powerwall 3 at $15,647 on Smart Saver, delivering 10 kWh a weekday into the peak: 85 summer weekdays at 40.51¢ − 7.67¢ ÷ 0.9 and 165 winter weekdays at 21.69¢ − 6.35¢ ÷ 0.9. Rates held flat with 2% yearly fade. Not counted: backup value, weekend use, the intermediate period and any future battery program.
Figures are gross payments and bill value before taxes and financing. Gross payments are not net profit. Peak Time Savings is event-based demand response; Smart Saver is a price signal, not a VPP. Stacking needs care, depending on M&V methodology.
VPP Economics has no affiliation with, sponsorship from, or endorsement by Ameren Missouri, the Missouri PSC, MISO, Optiwatt, Tesla or any company or utility named here.
Sources
Ameren Missouri, the PSC and MISO
- Ameren Missouri — Residential rate options
- Ameren Missouri — MEEIA program extension filing, September 2026
- Ameren Missouri — Millcreek energy center
- MISO — 2026 Planning Resource Auction results