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Solar FAQs

Frequently Asked Questions about Solar

Frequently Asked Questions About Solar

On June 1, 2018, Senate Bill 564 (SB 564) was signed into law. This modern energy legislation includes updates to Ameren Missouri's solar programs in the form of solar rebates and utility-owned solar. The solar rebates provided for in the law are only available to systems that become operational on or after Jan. 1, 2019. Please click here for information regarding Ameren Missouri solar rebates.  
It is a meter that can measure the flow of electricity in 2 ways.  It measures how much energy comes from Ameren (kWh delivered) when the solar system is not producing electricity like at night.  It also measures the difference between what is generated by the solar system and the customers load. It does NOT measure the solar systems total production.  As the system is producing electricity, this energy is used to meet the customer's electric requirements.  If more energy is produced than used this electricity is fed to the utility.  This is typically during daylight hours.  The bi-directional meter records this.  At night when the solar is not producing the customer is using electricity from Ameren.  If the customer produces more that they use they will see a credit on their energy statement.  If the customer uses more than they produce they are charged for this power.  Net metering is for customers with solar systems sized 100 kW and less. Find out more. 
A bi-directional meter is a meter that can measure the flow of electricity in two directions - flowing from Ameren Missouri's power grid to a customer and flowing from a customer's home or business back to the power grid.

Your energy statement will include a few new items. You will now see how much energy you are sending to Ameren Missouri-Customer kWh to Utility. You will also see how much you are purchasing from Ameren Missouri-Net Billable kWh. Please view a sample bill (PDF).

Please note the following regarding net metering:

  • You WILL BE billed a one-time charge for your new Bi-directional meter, $226 (Single Phase) and $169 (Three Phase). This charge will appear on the first energy statement after the meter is installed.
  • If your solar system produces more energy than you use, you will receive a credit on your energy statement at the net metering rate of:
    • SUMMER (June through September) 2.87 cents per kWh
    • WINTER (October through May) 2.84 cents per kWh
  • If your system produces more than you consume you WILL NOT have a zero bill. All other regular monthly charges will still apply.
Ameren does not install solar or recommend solar installers. Please visit www.MOSEIA.com for a list of solar installers in Missouri or see a list of installers who have completed solar installations in the Ameren Missouri service territory in the past year.

Ameren Missouri must review your renewable project before operation/installation to determine whether the renewable system could adversely affect the safety, reliability or quality of the local electric utility service. See the Ameren Service Manual (PDF) for technical requirements reference. Also see recent Residential Meter Socket Change Information (PDF).

Sample one lines (PDF)


Solar panels absorb energy from the sun and convert it to direct current (DC) electricity. Most homes and businesses run on alternating current (AC) electricity. The DC electricity is passed through an inverter to convert it to AC electricity, which is then used or sent back to the grid.

The maximum allowable system size in kW DC is calculated based on your past 12 month usage.  If a customer account has a single revenue meter, please see the example below to calculate maximum allowable. 

Most recent 12 billing month load kWh/(8,760 hrs. x 15.6% Capacity Factor) = Maximum Allowable Nameplate Capacity in kW DC

Example:

Previous 12 month load = 13,512 kWh

  • Hours in a year = 8,760 hours
  • Solar Capacity Factor = 15.6% (based on DOE PV Watts)
  • Maximum Allowable Nameplate Capacity = 13,512/(8,760 x 0.156) = 9.887 kW

*Please note, this formula should be used only as an estimate. Upon receipt of a Net Metering Application, Ameren Missouri will evaluate the account and calculate the maximum based on the most recent 12 month usage.

For net metering, installation agreements cannot exceed 100 kW.

For Residential new construction, please contact Ameren Renewables with your new home’s square footage (living space only – minus garage and basement even if finished) to obtain your maximum solar nameplate capacity.

For Commercial new construction, please complete the Commercial Load Sheet and email to Ameren Renewables to obtain your maximum solar nameplate capacity.

If adding panels to an existing solar system, the solar system must still be within the maximum allowable nameplate capacity.

Maximum Allowable Nameplate Capacity = 13,512/(8,760 x 0.156) = 9.887 kW

*Please note, this formula should be used only as an estimate. Upon receipt of a Net Metering Application, Ameren Missouri will evaluate the account and calculate the maximum based on the most recent 12 month usage.

A Qualifying Facility is a solar installation above 100 kW.  Under a Qualifying Facility, no netting of energy occurs.  The agreement requires the customer to make one of the following choices:
  • No excess energy will be purchased by the Ameren Missouri.  The metering equipment necessary to measure the energy from the customer to Ameren Missouri will not be installed.  Any energy delivered from the customer to Ameren Missouri will not be measured and the customer will not be compensated for this energy.

  • Excess energy purchases by Ameren Missouri-Metering equipment to measure the delivery of energy from the customer to Ameren Missouri will be installed.  Any energy delivered by the customer to Ameren will be purchased by the company based on Ameren's Electric Power Purchases from Qualifying Facilities tariff, and the customer will be assessed a monthly Customer Charge Specified in Section 1.c. which is 2.5 cents per kW at this time.   This is in addition to the regular customer charge under Ameren's standard rates for retail electric service.  Energy purchased by Ameren Missouri will be at the rates specified in 1.a of the tariff.
  • A one line diagram and spec sheets for the equipment are required with the Qualifying Facility application for our engineering staff to review. 
Yes, you can self-install solar.  Ameren Missouri recommends contacting an installer as they know our requirements for the interconnection application process.
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