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OVERVIEW OF TVA DRAFT 2025 IRP + EIS
Resource Options
Scenarios
Strategic Portfolio Direction
Portfolios to be Analyzed
Generates
Model
Assessments
Sensitivities
Strategies
Modeling Assumptions
THE PROCESS, TO DATE Together, TVA and the IRP Working Group spent months identifying IRP “scenarios” (possible futures TVA could find itself operating in between now and 2050) and “strategies” (alternative business approaches to help meet electricity demand in these futures).
6 SCENARIOS 5 STRATEGIES x
30 PORTFOLIOS
Stakeholder feedback and public comments informed the development of scenarios and strategies that combine to form 30 unique portfolios.
Reference (without GHG Rule) Higher Growth Economy
1
Baseline Utility Planning
A
1B
1B
1D
1E
1A
2
Carbon-free Innovation Focus
B
2B
2B
2D
2E
2A
Stagnant Economy
3
Carbon-free Commercial Ready Focus Distributed and Demand-side Focus
3B
3E
3B
3D
3A
C
Net-zero Regulation
4
4B
4E
4B
4D
4A
D
Net-zero Regulation + Growth Reference (with GHG Rule)
5
5B
5E
5B
5D
5A
Resiliency Focus
E
6B
6B
6D
6E
6A
6
To ensure the draft considered the latest information, when TVA learned in spring 2024 that the Environmental Protection Agency would imminently be releasing its final Greenhouse Gas Rule, TVA paused the IRP publication date to allow for additional analysis that incorporates the finalized rule into the IRP. TVA and the IRP Working Group developed a list of power generation resource options for the IRP that includes mature technology options such as nuclear, hydro, coal, gas, renewables, storage, energy efficiency (EE) and demand response (DR) technologies. The IRP also considers emerging technologies such as small modular reactors, carbon capture and sequestration, hydrogen blending and advanced chemistry batteries. TVA modeled the five strategies in the six scenarios. The modeling generated 30 unique potential resource “portfolios” – the power supply mix that results from assessing a particular strategy in a particular scenario. Based on least-cost planning principles and with input from the IRP Working Group, TVA developed a set of metrics to assess how each strategy performs in each scenario.
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