Draft Interconnection Application Hybrid Solar Storage

Skill: Draft Large Generator Interconnection Application for Hybrid Solar-Plus-Storage Facility

1. Subject-matter triage

• Confirm the governing form, tariff attachment procedures, and any instructions for hybrid resources before filling anything in.
• Determine whether the storage component is grid-charging, generation-only charging, or mixed; treat that as a threshold fact because it can change study treatment, fee treatment, and disclosure obligations.
• Identify whether the project is a single-site filing or spans multiple parcels, and whether any prior filing, withdrawn filing, or prior study exists for the same point of interconnection.
• Separate filing-ready facts from open items that require client confirmation, transmission-provider clarification, or supplemental documentation.

2. Failure modes the skill is correcting

• Completing the form from project summaries without checking the tariff-specific instructions for hybrid facilities, causing missing disclosures or misclassified technical inputs.
• Treating the storage block as administratively incidental instead of analyzing whether its charging configuration triggers different queue, study, or fee consequences.
• Overlooking site-control inconsistencies across parcels, especially where lease terms do not align with the interconnection service horizon.
• Omitting a credit-support check or assuming the applicant entity itself satisfies financial qualification without support from the source documents.
• Failing to surface whether prior study data, re-filing history, or affected-system coordination changes the application posture.
• Drafting the issues memo as a general narrative rather than a decision tool that identifies each open point, its basis, impact, and next step.
• Writing the transmittal letter as a summary only, without clearly listing the filing package and any items submitted subject to confirmation.

3. Legal frameworks / domain conventions that apply

• FERC large generator interconnection procedures govern queue entry, study processing, and service selection for the project; apply the tariff and related form instructions as the primary authority for each field.
• Hybrid-facility treatment depends on how the storage resource is configured and charged; disclose charging assumptions and flag any need for supplemental study, separate treatment, or provider clarification under the applicable interconnection procedures.
• Site control must be sufficient for the relevant project term; any lease or easement that expires earlier than the expected service period creates a filing risk that should be identified against the form and supporting site documents.
• Creditworthiness and security requirements depend on the applicable tariff standard; if the applicant’s own financial profile is not enough, the filing package should identify the missing support and the likely security mechanism.
• Prior-filing and prior-study provisions may allow limited carryover or disclosure obligations; the source documents should be checked for queue history, withdrawal history, and any study-data reuse conditions.
• Environmental and species consultation status should be disclosed when relevant; pending consultation is not merely background and may affect timing, permitting sequence, and interconnection schedule.
• Generator step-up transformer sizing should be tested against the total project output at full operating mode, including storage discharge if the design contemplates it; undersizing can constrain operations or require redesign.
• Service-type selection should be analyzed in light of project commercialization, financing, and delivery needs, with the tariff text and source documents providing the basis for the recommendation.
• Application fee treatment for hybrid resources may depend on tariff-specific methodology; any ambiguity should be flagged for confirmation rather than assumed.

4. Analytical scaffolds

• Read the form, instructions, tariff attachment, and source documents together; do not populate a field until the controlling source for that field is identified.
• For each form field:
  • identify the controlling source document;
  • extract the exact fact or range required;
  • check for internal consistency across documents;
  • note any missing, conflicting, or qualification-dependent information.
• For each parcel or site-control item:
  • identify the parcel;
  • identify the controlling term;
  • compare it to the project’s expected interconnection/service horizon;
  • flag any mismatch or gap.
• For each credit-support item:
  • identify the applicant entity;
  • identify the stated financial qualification or support instrument;
  • compare it to the tariff requirement;
  • flag any shortfall or ambiguity.
• For each technical item:
  • confirm whether the project description, one-line, transformer sizing, charging mode, and operating assumptions are mutually consistent;
  • flag any point where the storage block changes the answer.
• For each open issue in the memo:
  • state the issue;
  • cite the controlling tariff provision, form instruction, or source-document basis;
  • explain the filing or project consequence;
  • recommend the next step.
• Where more than one service option, filing posture, parcel, or history item exists, enumerate the alternatives first, then analyze each one separately rather than collapsing them into a single pass.

5. Vertical / structural / temporal relationships

• Map the project structure vertically: parent applicant, project entity, site-control package, technical package, and any security support should align with each other and with the form.
• Map the project temporally: development status, permitting status, consultation status, filing date, study history, and expected commercial operation date should be internally consistent.
• Treat the storage component as temporally and operationally distinct from the generation component where the source documents do so; do not assume identical charging rights, operating limits, or fee treatment.
• If multiple parcels or documents have different end dates or assumptions, identify the earliest expiring or most restrictive item as the practical constraint.

6. Output structure conventions

• Produce the completed Form 1-LG as a standalone filing document populated from the source documents, with any supplemental sections needed to make the filing coherent and complete.
• Draft a transmittal cover letter that identifies the filing package, the applicant, the project, the requested interconnection posture, and any enclosed supporting materials.
• Draft a separate internal issues memo clearly marked as internal and not for filing.
• In the issues memo, use a uniform severity scale defined once at the top, and apply it consistently to each issue.
• For each issue entry, include the controlling authority or source basis, the practical impact, and a concrete recommended action.
• Address the comparative service-selection analysis explicitly, including the financing and offtake implications that support the recommendation.
• Close the memo with a Recommended Actions section that assigns the next step to the relevant role and ties it to a filing, consultation, or milestone deadline.
• Before finalizing, verify that the primary filing document is complete and non-empty, and that the cover letter and memo are secondary to the completed application rather than substitutes for it.