Adding a wind turbine, solar photovoltaic system, micro turbine, or fuel cell to your home or business and connecting it to the Alliant Energy distribution system is called an interconnection. This process emphasizes safe installation.

Iowa customer requirements

If you install generation, you and your installer are responsible for following the interconnection rules of the Iowa Utilities Board (IUB) and for meeting all Alliant Energy tariff requirements.

The State of Iowa requires that owners of alternative energy production facilities, such as solar photovoltaic and wind turbines, notify their utility company of plans to construct, install and operate any system that will be connected to the utility’s systems (electric transmission lines, distribution lines or attached equipment).

This notice must be in written form and must be received by the utility at least 30 days prior to start of construction. Alliant Energy customers may submit this information using the applicable Standard Interconnection Application Form available below.  Items that must be included in the notice:

  • Planned operation date of the energy facility
  • Notification of intent to construct
  • Type of energy facility being constructed

If you have any questions about advance notification, please contact Alliant Energy's Renewable Hotline at 1-800-972-5325.

If you connect to our distribution system with a generation facility of up to 20 megawatts (MW) capacity, you must comply with Iowa Administrative Rules, Chapter 15 (IUB 199.15) and Chapter 45 (199.45) (Click on Iowa Administrative Code (IAC) – Current & Archive, then scroll down to Utilities Division [199]).

Wisconsin customer requirements

If you are installing your own generation with a capacity of up to 15 megawatts (MW), whether it is rooftop solar, a micro wind turbine or fuel cell to your home or business, you and your installer must follow the Public Service Commission of Wisconsin (PSCW) interconnection rules. In addition, you must meet all of Alliant Energy’s tariff requirements.

Customers are encouraged to check with Focus on Energy, Wisconsin utilities’ statewide program for energy efficiency and renewable energy, for potential grants and available incentives.

Your responsibilities

You and your installer are responsible for coordination of design, installation, operation and maintenance of any generation system you install, and for conforming to the requirements of our tariffs and rules, and applicable governmental laws and regulations (local, state and federal).

These requirements are designed to protect distribution system facilities; avoid electrical interference problems; ensure the safety of customers, electric provider employees and the general public; and maintain overall system reliability.

You are required by law to maintain liability insurance (equal to or greater than the amounts indicated in IAC 199.45 for Iowa customers, PSC 119 for Wisconsin customers) or to prove financial responsibility by another means agreeable to us. You are required to notify us if a material modification is made to your generation facility at any time during or after the installation process. A material modification is any modification that changes the maximum electrical output of your facility or changes the interconnection equipment, including:

  • Changing from certified to non-certified devices
  • Replacing a component with a component of different functionality or UL listing

You also are responsible for the proper installation, operation and maintenance of the specified protective devices. Finally, you shall obtain, at your expense, any and all authorizations, permits and licenses required for the construction and operation of your generating facilities.

Alliant Energy's responsibilities

We are responsible for promptly carrying out the steps listed below and for meeting all required steps and timelines to process your interconnection application.

The process for Iowa customers

This should provide you a general overview of the interconnection process.  Each application is handled on a case-by-case basis and may include additional requirements not mentioned here. It is important that you contact our Renewable Hotline at 1-800-972-5325 as a first step to determine what you will need to complete to safely interconnect with the electrical system.

Step 1 – Notification

The State of Iowa requires that owners of alternative energy production facilities, such as solar photovoltaic and wind turbines, notify their utility company of plans to construct, install and operate any system that will be connected to the utility’s systems (electric transmission lines, distribution lines or attached equipment).

This notice must be in written form and must be received by the utility at least 30 days prior to start of construction. Alliant Energy customers may submit this information using the applicable Standard Interconnection Application Form available below. Items that must be included in the notice:

  • Planned operation date of the energy facility
  • Notification of intent to construct
  • Type of energy facility being constructed

Call our Renewable Hotline at 1-800-972-5325 to inform us that you want to interconnect an electric generating system to our distribution system.  We will help you determine the appropriate application and agreements to complete depending on the facilities that you wish to install and interconnect with our system.

We respond to your request and provide all materials necessary to complete your interconnection application. All documents, forms and applications are included in the Documents section on this page.

Step 2 – Interconnection application

Complete and submit a Standard Interconnection Request Application form (Level 1 or Level 2-4), proof of insurance (if required), other facility information ( i.e. one-Line diagram, plot plan, manufacturer’s technical specifications and label information) from a nationally recognized testing laboratory.

You can submit this information through our online application, or mail it along with your application fee to:

Alliant Energy Renewable Hotline
GO-8
P.O. Box 351
Cedar Rapids IA 52406-0351

Please note: In its 2015 session, the Iowa Legislature passed House File 548 (HF548), an act requiring the Iowa Utilities Board to adopt administrative rules relating to the safety of distributed electric generation facilities. The bill was signed into law on May 1 and became effective on July 1, 2015. Accordingly, one-line diagrams must show the presence of a lockable visible disconnect and plot plans must show the location of the Alliant Energy meter in relation to the lockable visible disconnect; the disconnect should be adjacent to the Alliant Energy meter.

Step 3 – Application review

If the Standard Interconnection Request Application (Level 1 or Level 2-4) is incomplete or the fee is not received, Alliant Energy will notify you to resubmit.

If the Distributed Generation Interconnect Request is complete, our Renewable Hotline will notify you the application has been accepted. An Alliant Energy Distribution Engineer may contact you to explain the terms and conditions and to obtain any additional technical specifications, if required for your project.

Step 4 – Engineering review and approval

Our Distribution Engineering team will complete an engineering review to determine any changes to the distribution facilities or upgrades that are required to serve your generator. A feasibility study and an impact study may need to be completed.

We will notify you in writing with an estimate of the costs associated with any distribution facility changes or upgrades required. You must notify us in writing (email is acceptable) to indicate acceptance of project terms and conditions. When additional investment in facilities is required, you must state your willingness to pay for the additional facilities. If you are not willing to pay for the required facilities, the interconnection request is then canceled.

Step 5 – Interconnection agreement

Our Renewable Hotline will complete the following documents and forward to you for your approval and signature:

  • Applicable Standard Interconnection Agreement
  • Certificate of Completion
  • Attachment 2 of the applicable interconnection agreement (if applicable)
  • Attachment 3 which details any necessary changes to distribution facility or upgrades (if applicable)
  • Any other required documentation necessary for your project

You return the following forms to our Renewable Hotline:

  • Signed applicable Standard Interconnection Agreement
  • One signed original copy of the Certificate of Completion (required within 12 months of Alliant Energy-signed agreement)
  • Completed Attachment 2 (if applicable)
  • One copy of signed electric inspection form (required within 12 months of Alliant Energy-signed agreement)
  • Payment for facility upgrades (if required)

Step 6 – Installation of customer generation

If required for your project, after we receive payment, we perform all work needed to upgrade our distribution system to accommodate your generating equipment.

You install your generating equipment within a timeframe that is mutually agreed upon. Please maintain ongoing communications regarding your project schedule and projected completion date with Alliant Energy personnel so that we may ensure proper interconnection with our facilities. 

Before metering will be installed, you must provide documentation of a successful state electrical inspection. Special metering will then be installed and, if required, a witness test conducted by an Alliant Energy Distribution Engineer will be completed.

Step 7 – Completion

You will be notified that the interconnection with IPL facilities is approved. A signed original Standard Interconnection Agreement and Certificate of Completion will be sent to you for your records. Your generating equipment should not be in operation prior to receiving this permission to operate. 

Certificate of Insurance

To comply with the interconnection agreement, the interconnection customer shall maintain the required general liability insurance. Please use the following official Alliant Energy Iowa utility name and address on the Certificate of Insurance:

Interstate Power and Light Company
200 1st Street SE
Cedar Rapids, IA 52401

Please remit annually to:

Alliant Energy Renewable Hotline
GO-8
P.O. Box 351
Cedar Rapids, Iowa 52406-0351

Rules and technical guidelines

Iowa Administrative Code – Electric Interconnection of Distributed Resources Facilities Rule

Alliant Energy Technical Guidelines and Requirements for the Interconnection of Parallel Operated Generation

Alliant Energy Electric Service Rules (includes meter and label diagrams) – Chapter 5, Distributed/Customer-Owned Generation

Tariff and power purchase information

Net Metering Pilot – Renewable Energy Facilities (Sheet 39, Rate Code NM) 

Cogeneration & Small Power Production (Sheet 49, Rate Code CSPP)

Cogenerators, Small Power Producers, Alternate Energy Producers & Small Hydro Production (Section 16)

Alternative Energy & Small Hydro Production (FROZEN Sheet 52, Rate Code AEP)

The process for Wisconsin customers

The steps below are required by state law to interconnect to our distribution system. Links to actual state law and associated guidelines are included at the end of this page.

Step 1 – Notification

Call 1-800-972-5325 to inform us that you want to interconnect an electric generating system to our distribution system.

We respond to your request within five working days and provide all materials necessary to complete your interconnection application. All documents, forms and applications are included in the last section of this page.

Step 2 – Interconnection application

Complete and submit the appropriate distributed resources application form per the links that follow, or through our online application, making sure all parts of the application are completely filled out.

Name and address under “Electric Services Distributed By” must be to the following on the Interconnection Application:

Wisconsin Power and Light Company
4902 North Biltmore Lane
Madison, WI 53718

The following required documentation will need to be included:

1. Interconnection Agreement and an application fee if applicable (Interconnection Agreement is optional at this point but will need to be completed before permission to operate is granted and generation can begin. If submitted upfront with the Application, it will speed up the approval and permission to operate process – Please see Step 12.)

Name and address under “Electric Services Distributed By” must be to the following on the Interconnection Agreement:

Wisconsin Power and Light Company
4902 North Biltmore Lane
Madison, WI 53718

2. Proof of insurance showing the appropriate liability insurance based on category.

Category 2 to 4 will need to name Wisconsin Power and Light Company with the address shown above as an additional insured party under Additional Interest, Certificate Holder, etc. on the Certificate of Insurance

Category 2 to 4 will have to note “Certificate holder is named as an additional insured” in Description of Operation, Remarks, etc. on the Certificate of Insurance.

3. One-line diagram

4. Plot plan

5. Spec sheets for inverter

6. Spec sheets for solar panels/wind turbine

Please review and follow State of Wisconsin, Public Service Commission Chapter PSC119 guidelines. If any information is missing, it will be returned to you as incomplete.

Distributed Resources Application for Generation 20 kW or Less – PSCW form 6027

Distributed Resources Application for Generation Greater than 20kW up to 15 MW –PSCW form 6028

If mailing a hard copy, send the completed application to:

Alliant Energy Renewable Hotline
GO-8
P.O. Box 351
Cedar Rapids, IA 52406-0351

Step 3 – Application review

Within 10 working days of receiving a new or revised application, we notify you whether the application is complete. If the application is incomplete, you will need to resubmit it with the needed corrections. We also will send you the appropriate standard interconnection agreement and surplus energy purchase power agreement, if applicable. Both must be signed by you and by us prior to commencing parallel generation.

Step 4 – Engineering review determination

When your application is complete, we determine whether an engineering review is needed. If an engineering review is necessary, we notify you within 10 working days and state the cost we will charge you for that review. Please consider utility input when specifying components to insure that your components will work on the Alliant Energy distribution system.
Note: If you are not notified about a review in 10 days, go to Step 10.

Step 5 – Engineering review

After you notify us in writing to proceed and submit applicable payment, we will complete the engineering review and notify you of the results.

Step 6 – Distribution system study determination

If the engineering review determines that a distribution system study is necessary, we will include a written cost estimate in the review summary.

Step 7 – Completion of distribution system study

After you send us written notification to proceed and pay the applicable fee, we conduct the distribution system study. This study assesses the impact your generating system will have once connected to our grid. We provide you with the study results.

Step 8 – Notification of construction or modification costs

We notify you of distribution system study results and costs associated with any construction or modifications to our grid.
You provide a written agreement to pay for work related to the interconnection modifications.

Step 9 – Installation of customer generation

You submit payment for required upgrade of our distribution system. You install your generating equipment within a timeframe that is mutually agreed upon. You notify us when project construction is complete.

After we receive payment, we perform all work needed to upgrade our distribution system to accommodate your generating equipment.

Step 10 – System testing and acceptance

You are required to notify us of the completed installation and give us an opportunity to witness or verify system testing. You also are required to provide us with any test results.
After we receive notification that an installation is complete, we do one (or more) of the following:

  • Witness commissioning tests
  • Perform an anti-islanding test or verify protective equipment settings at our expense, OR
  • Waive our right, in writing, to witness or verify commissioning tests

Please note: You may be charged for testing, calibrating and re-testing.

Step 11 – Testing approval/rejection

We notify you of our approval or rejection of the interconnection. If approved, we provide a written statement of final acceptance and cost reconciliation. If we do not approve the interconnection, you may take corrective action and ask that we re-examine your interconnection request.

Step 12 – Interconnection agreement

After you receive an interconnection approval notice, the appropriate interconnection agreement must be signed by you and us before parallel generation operation commences. If it was not signed and included with the original application, please choose the appropriate form from the links that follow and mail to the address below.

Distributed Resources Interconnection Agreement for Generation 20 kW or Less – PSCW form 6029

Distributed Resources Interconnection Agreement for Generation Greater than 20kW up to 15 MW – PSCW form 6030

Mail the completed Interconnection agreement to:

Alliant Energy Renewable Hotline 
GO-8
P.O. Box 351
Cedar Rapids, IA 52406-0351

Distributed Resources documentation

Distributed Resources Application for Generation 20 kW or Less – PSCW form 6027

Distributed Resources Application for Generation Greater than 20kW up to 15 MW –PSCW form 6028

Distributed Resources Interconnection Agreement for Generation 20 kW or Less – PSCW form 6029

Distributed Resources Interconnection Agreement for Generation Greater than 20kW up to 15 MW – PSCW form 6030

Distributed Resources Rate Form for Residential/Commercial Generation 20 kW or Less

Rules and technical guidelines

Wisconsin Distributed Resources Interconnection Guidelines

Helps explain PSC 119 and how these rules are expected to be implemented by utilities and customers. We recommend reading these rules and guidelines before beginning the interconnection process.

Alliant Energy Technical Guidelines for Interconnection of Parallel-Operated Generation Connected to the Distribution System 

Alliant Energy Electric Service Rules - Chapter 5, Distributed/Customer-Owned Generation

Tariff and power purchase information

Parallel Generation (In Excess of 20kW) – Sheet 7.75, Schedule PgS-1.pdf

Parallel Generation (20kW or less) – Sheet 7.80, Schedule PgS-3.pdf 

Parallel Generation – Specifications – Sheet 7.90, Schedule PgS-4.pdf

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