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December 5, 2025

Transmission Planning

MISO
MISO Cuts Renewable Estimates in Tx Planning Scenarios
MISO has slashed earlier renewable energy estimates and boosted natural gas contributions in its transmission planning futures in a rethink brought on by the Trump administration’s One Big Beautiful Bill Act.
Yes Energy
Stakeholder Forum: Surplus Interconnection Can Maximize Capacity in ISO-NE
In New England, rules governing how new resources connect to the regional grid limit full use of the system’s potential. Precious “surplus” capacity can and should be leveraged to interconnect new, low-cost clean energy technologies to deliver more reliable, affordable power, says Alex Lawton.
SPP
SPP Considers Deferring 765-kV NTCs to 2026
SPP says accelerating load projections will result in a 2025 transmission plan that dwarfs the previous year’s record $7.65 billion portfolio — so much so that it is considering deferring some projects until 2026.
Shutterstock
Speculative Data Centers Highlight Need for Effective Forecasting, Experts Say
Utilities face significant forecasting risks from large loads, prompting the industry to develop various strategies to eliminate speculative projects, experts said during a Western Interstate Energy Board webinar.
© RTO Insider 
New England Energy Experts Talk Renewable Development Under Trump
Energy experts and officials stressed the importance of proactive transmission planning, interconnection reform and increased demand-side flexibility at Raab Associates’ New England Electricity Restructuring Roundtable.
AdminMonitor
Texas PUC Releases Rulemakings for Large Loads
Texas regulators proposed new rules on large load forecasting criteria and net metering following the state’s recent biennial legislative session and opened them up to public comment.
California Governor's Office
Newsom Signs Calif. Pathways Bill into Law
California Gov. Gavin Newsom signed into law the bill that will allow CAISO to transition the governance of its markets to an independent “regional organization,” along with five other bills related to energy and emissions.
© RTO Insider
MISO Interconnection Queue Drops to 215 GW on Tax Incentive Phaseout
MISO’s generator interconnection queue has fallen to 215 GW as developers cut back on projects in response to the federal phaseout of renewable energy tax incentives, RTO leadership said.
MISO
MISO Kicks off South’s Long-range Tx Plan with More Restrained Approach
MISO will start evaluating its South region for long-term transmission needs in 2026, beginning with Louisiana, the RTO announced before its Board of Directors.
California Senate
Calif. Lawmakers Pass Bill to Accelerate Transmission Development
The California legislature passed a bill that would create a “transmission accelerator” to develop low-cost public financing programs for certain transmission projects. 

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