Use this guide
Choose the questions relevant to your situation. Expand each answer, save the checklist and request written clarification where evidence is missing.
Questions homeowners ask
Which size determines the published small-system tariff boundary?
Alliant’s Wisconsin guidance places systems with total nameplate capacity of 20 kW AC or less under PgS-3. Verify the actual AC rating and applicable tariff; a proposal’s panel DC total is a different measurement.
Source: Alliant Energy: Wisconsin customer-owned generation. Reviewed 2026-10-07.
Is the larger-system export treatment the same?
Alliant describes PgS-1 for systems above 20 kW AC within its stated range. Imports and exports are accounted for separately; exported energy does not offset delivered energy one-for-one. Confirm the actual tariff.
Source: Alliant Energy: Wisconsin customer-owned generation. Reviewed 2026-10-07.
Does installation approval authorize parallel operation?
Alliant separates permission to install from later testing, acceptance, a fully signed interconnection agreement and permission to operate. Retain the actual operating notice before using the generating equipment.
Source: Alliant Energy: Wisconsin customer-owned generation. Reviewed 2026-10-07.
What if I replace equipment or enlarge the system?
Alliant requires notification of material modifications, including changes to maximum output or interconnection equipment. Ask it to classify the proposed change before treating a replacement or expansion as already approved.
Source: Alliant Energy: Wisconsin customer-owned generation. Reviewed 2026-10-07.
How can a replacement installer access the existing application?
Alliant directs customers changing installers to sign and return its Renewable Customer Authorization letter. The utility can then grant the replacement access to existing PowerClerk project documentation. Request the actual handoff record.
Source: Alliant Energy: Wisconsin customer-owned generation. Reviewed 2026-10-07.
Which state form should I use for this project or a home transfer?
Wisconsin PSC lists current application, technology supplements, interconnection agreements and a change-of-ownership form. It directs customers to obtain the appropriate forms from their serving electric provider and submit completed forms to that provider.
Source: Wisconsin PSC: customer-owned generation and forms. Reviewed 2026-10-07.
Will solar eliminate the utility bill’s fixed charges?
Alliant says customers continue receiving bills and remain responsible for the applicable monthly customer charge and tax; demand or other charges may also apply. Read the actual rate schedule rather than assuming every charge disappears.
Source: Alliant Energy: generating your own solar. Reviewed 2026-10-07.
Your decision checklist
- Confirm Wisconsin Power and Light is the actual serving utility and identify the tariff.
- Record AC nameplate capacity separately from the panel DC total.
- Compare import, export and surplus settlement terms in the current tariff.
- Ask the utility which forms and project-specific requirements apply.
- Retain installation approval, final acceptance, signed agreement and operating permission separately.
- Ask how proposed equipment changes or a replacement installer affect the application.
- Keep unresolved questions, responsible parties and written responses in a private folder.
Save or print this guide from your browser. Keep completed records privately.
Keep AC size and project changes traceable
| Record | Evidence and next question |
|---|---|
| Service and tariff | Serving utility, actual tariff name, effective date and questions about eligibility; keep account identifiers private. |
| Equipment quantities | Panel DC total, inverter AC nameplates and installer explanation of the proposed facility rating. |
| Billing assumptions | Import, export and surplus terms, fixed charges and the provider’s written explanation for the account. |
| Application records | Current forms supplied by the utility, actual submission reference and unresolved correction requests. |
| Operating milestones | Installation approval, final acceptance, fully executed agreement and actual permission-to-operate notice. |
| Changes and handoff | Proposed equipment scope, utility response, replacement-installer authorization and records received. |
| Outstanding action | Specific question, responsible party, requested record, dated response and next agreed step. |
Fictional quote example: one proposal lists 22 kW of panels in DC and 18 kW of inverter capacity in AC. Another lists only a single number labeled system size. These are invented quantities, not recommended designs. Ask each bidder to identify the rating, equipment and measurement basis used in its billing assumptions, then obtain the actual utility determination.
Fictional handoff example: a homeowner receives a replacement contractor’s proposal while the original application folder remains incomplete. List the records held, missing items and unresolved questions. Ask for a written division of responsibilities and verify what the utility has actually received. A new proposal does not by itself demonstrate that records, permissions, warranties or contractual duties have transferred.
Reviewed October 7, 2026 against Alliant’s Wisconsin interconnection and tariff guidance, Wisconsin PSC’s customer-owned generation forms guidance and Alliant’s homeowner solar information. This resource concerns Wisconsin Power and Light service; Alliant’s Iowa process and another Wisconsin provider’s tariff are separate. Confirm current account-specific instructions and terms.
The organizer and invented examples are editorial preparation aids, not additional utility requirements, engineering designs or a legal determination. Request the current tariff, complete interconnection instructions and any project-specific insurance, permit, fee or technical requirements. No current export price, fee amount, processing deadline, incentive entitlement, cash payout or guaranteed savings is promised. The utility’s actual decision controls the application; a worksheet, portal status or sales estimate cannot supply it.
Use existing documents and safely visible information. Do not open electrical equipment, test wiring, operate disconnects or change inverter settings to answer an application or billing question. Qualified providers should handle technical work. Keep account and meter identifiers, service addresses, credentials, private contracts, signature links and household usage out of public examples.
Continue with solar bill and measurement basics, permit and utility milestones and Wisconsin proposal and contract records. Solar Survey AI’s evidence methodology distinguishes observed facts, assumptions and actual decisions. For site concerns, confirm available inspection scope, location availability, qualifications, access, fees and commercial conflicts. Third-party does not automatically mean independent. A survey cannot assign a utility tariff, authorize operation or transfer a contract. Homeowner monitoring connections and planned free remote diagnosis remain coming soon.
About these guides
Published by Solar Survey AI, a commercial survey-services company. Our original decision checklists are recommendations; linked authorities support the referenced facts. We may benefit if you purchase our services. This is not independent certification of our company, a project-specific engineering decision or personal tax/legal advice. Local rules, contracts and site evidence control individual decisions. Reviewed 2026-10-07.
For available survey or inspection services, confirm your project scope and availability with our team. Our planned free homeowner remote diagnosis remains coming soon.
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