Economic planning
ATC utilizes two methods to determine which projects have the potential for economic benefits:
- Stakeholder Input and Analyses
- Reliability Project Screening
These methods are described below.
Stakeholder Input and Analyses
In March 2008, Federal Energy Regulatory Commission (FERC) Order 890-A took effect. Order 890-A requires a coordinated, open, and transparent transmission planning process on both a local and regional level. To comply with these requirements, ATC submitted a compliance filing on Order 890-A that provides a timeline of actions to ensure that the economic planning process is both coordinated and open. ATC has also submitted a compliance filing on Order 1000 that incorporates public policy requirement needs into its economic planning analysis.
Annually, ATC will use a process with consistent timelines that combines stakeholder input, historical data, future line flow forecasts, and updated information on the electric system to identify transmission upgrades for economic evaluation.
Each year:
- During February, we hold an initial stakeholder meeting to review the market congestion summary and potential fixes and to discuss economic study scenarios, drivers, ranges, and assumptions.
- By March 1, we work with stakeholders to request and prioritize new/other economic studies and recommend study assumptions.
- By April 15 – we identify preliminary areas of economic study, study assumptions, and models and solicit further comments from stakeholders, including soliciting stakeholders for public policy requirements that drive transmission needs.
- By May 15 – we finalize areas of economic study, study assumptions, and models to be used in analysis, including a determination as to why or why not public policy requirements were included in the assumptions.
- By November 15 – we provide a summary of the results of the economic analyses to our stakeholders.
ATC conducts analyses of the projects identified for study over several months’ time and posts the key results, including the extent to which these savings offset project costs. When the expected benefits of a studied project are high enough to justify its costs, the process of developing it as a formal proposal is begun.
As a result of the 2021 ATC/stakeholder collaborative process, we are performing economic analyses on the following ATC facilities:
Economic Planning Study Areas
- North Lake Geneva 138-kV Area
- De Pere 138-kV Area
Studies are performed and results shared with stakeholders over the course of the year. In addition, customers and stakeholders who would like to request specific economic studies can do so if they are willing to pay for the studies and are willing to have the results posted publicly.
Reliability Project Screening
Economic analyses were performed on 14 projects from the 2020 10-Year Assessment project list to determine whether those projects were candidates for acceleration or deferral based on economic considerations. Please refer Table EP-1 for the list of projects screened. The list of 14 projects was based primarily on the availability of redispatch and capital costs of the projects; however, lower cost projects specifically identified by the ATC planning department were also included in the study. Generation interconnection and distribution interconnection projects were not eligible for inclusion in this list. Further, capacitor bank projects were not considered since the voltage benefits provided were not captured by the PROMOD software analysis. Finally, projects with in-service dates prior to 2024 were not considered since development of those projects was too far underway to make scheduling changes. As a result of this screening, none of the projects showed significant economic savings to ATC customers. This may change depending on assumptions or modeling of the system. Economic planning will continue to work with reliability planning, if any further analysis needs to be completed.
A similar analysis will be performed in the 2022 10-Year Assessment based upon the 2021 Assessment project list.
Table EP-1
| Project # | Project | Planning Zone |
|---|---|---|
| 1 | Lincoln Pump Station - McKenna 69 kV (Y-145), Rebuild | 1 |
| 2 | McKenna - Castle Rock 69 kV (Y-47) | 1 |
| 3 | Winona - Atlantic 69 kV (Winona69), Rebuild | 2 |
| 4 | Acadamy - Columbus 69 kV (Y-21), Rebuild | 3 |
| 5 | Spring Green - Wick Drive 69kV (Y-170), uprate | 3 |
| 6 | Hillman - Darlington 138 kV (X-14/X-101), Rebuild | 3 |
| 7 | Darlington - Rock Branch 69 kV (Y-109), Rebuild | 3 |
| 8 | South Beaver Dam - Horicon 69kV (Y-134), rebuild | 3 |
| 9 | Gran Grae SS, Install a second 161/69 kV transformer | 3 |
| 10 | Crivitz SS, Transformer Replacement and Asset Renewal | 4 |
| 11 | North Appleton SS, Transformer Replacement and Asset Renewal | 4 |
| 12 | Wesmark - Rapids 69 kV (R-44), Rebuild | 4 |
| 13 | Oak St - Hwy V 69 kV (Z-26), Rebuild | 4 |
| 14 | Lincoln - Bluemound (43rd St) 138kV (5053), replace underground cable | 5 |