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December 5, 2025

Transmission Planning

Northwest Power and Conservation Council
NWPCC Study Finds Market Availability Steady Across Different Scenarios
The buildout of new resources in the Western Interconnection over the next 20 years is “remarkably similar” across a variety of scenarios tested by NWPCC’s market availability study.
Invenergy
Enviros Challenge MISO, SPP Queue Express Lanes
Environmental groups are further pressing their opposition to MISO's and SPP’s fast-track studies for primarily fossil fuel projects, challenging both at the D.C. Circuit in a pair of lawsuits.
MISO
$12B MISO 2025 Tx Portfolio Close to Final Approval
A MISO board committee advanced 432 projects from transmission owners at a cost of almost $12.3 billion under the RTO’s 2025 Transmission Expansion Plan.
ISO-NE
ISO-NE Provides More Detail on Responses to LTTP Procurement
ISO-NE published a summary of proposals submitted for its first longer-term transmission planning procurement, which is aimed at reducing transmission constraints.
© RTO Insider 
State Regulators Ponder Federal Role in Large Load Interconnections
State regulators say the push to give FERC jurisdiction over large load interconnections could leave the agency biting off more than it can chew around complex state-run processes, while failing to accomplish the intended goal of speeding approvals of hyperscale data centers.
Grid Strategies
Transmission Delays Mean Higher Costs for Customers, Study Finds
A new report WIRES commissioned from Grid Strategies quantifies the costs consumers face from delayed transmission projects based on analysis of eight major portfolios from four different markets around the country.
Shutterstock
BPA Looks to Fill 155 Positions After Hiring Freeze
The Bonneville Power Administration has resumed hiring after workforce reductions and a federal hiring freeze earlier in 2025.
Entergy Texas
MISO to Include Southeastern Texas in South Long-range Tx Planning
MISO announced it will honor a request from Texas regulators and include southeastern Texas in its first long-range transmission study for MISO South.
MISO
MISO Interconnection Queue Dips Below 175 GW
MISO’s generator interconnection queue now totals 174 GW across 944 projects, a result of several developers dropping out of the line in recent months.
© RTO Insider
SPP State Regulators Affirm Use of Highway/Byway Cost Allocation
SPP state regulators have approved several motions related to FERC Order 1920’s mandate for long-term, scenario-based planning to ensure the system can meet future needs and be fairly compensated.

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