Source Report

ERCOT Interconnection Queue Dynamics

ERCOT's queue exploded due to rapid solar and battery growth in Texas, reaching over 2,000 requests by May 2025, creating capacity constraints that force the ISO to study projects faster while implementing reforms like transparency tools to cut speculative entries and dropouts.[1] This mechanism—where high demand outpaces grid studies—leads to reliability risks, as unbuilt projects clog planning for real additions.

• More than 2,000 interconnection requests as of May 2025, up from prior explosive growth.[1]
• Reforms target lower dropout rates and increased transparency amid ongoing capacity shortages.[1]
• Contributes to national total of 1.82 TW queued capacity across 8,977 active requests (1995-2026 data).[3]

Implications for entrants: Reforms favor mature projects, so speculative developers face rejection; prioritize sites with existing transmission headroom to avoid multi-year delays.

PJM's "First-Ready, First-Served" Prioritization Shift

PJM overhauled its queue in 2023 from first-come-first-served to first-ready-first-served, using readiness deposits and AI tools to process 26+ GW via fast-track, slashing speculative multi-queue holdings that previously inflated backlogs by 2-3x.[1] This filters viable projects early, transferring rights from retiring plants and enabling surplus service for batteries, directly boosting completion rates.

• Over 26 GW fast-tracked since reform; AI partnership for queue management.[1]
• Part of broader queue rationing examined in recent reports.[2]
• Average U.S. time-to-online: 5.2 years (queue entry to operation), with PJM reforms aiming to shorten this.[4]

Implications for entrants: Deposit requirements (e.g., site control proof) weed out 50-70% of spec projects; co-locate with retiring coal/gas for faster rights transfer.

MISO Queue Caps and Express Lanes for Data Centers

MISO caps annual queue entries and added interactive tracking maps plus 2026 "express lanes" for four 15-project cycles targeting data center loads, reducing mid-process dropouts from hundreds of piled-up projects driven by Midwest demand surge.[1][5] The cap mechanism limits intake to match study capacity, prioritizing high-impact loads like big tech over speculative renewables.

• Hundreds of projects in queue; new cycles for data centers in 2026.[1][5]
• Queue rationing reforms under scrutiny for fairness.[2]
• Part of 1.46+ TW national backlog.[4]

Implications for entrants: Data center tie-ins get priority lanes; cap means missing cycles delays entry by 1-2 years—build site control early.

CAISO Multi-Track Reforms for Solar/Battery Clusters

CAISO's response to FERC Order 2023 introduced cluster-based multi-tracks with intra-cluster prioritization for mature solar/battery projects, overhauling intake and 2026 deliverability allocation to favor resource-rich zones and cut study timelines on a queue packed for state mandates.[1][6] This clusters studies by geography, allocating upgrades collectively to avoid individual project stalls.

• Cluster 15 report issued Dec 2025; ongoing reforms for 2027 cycle.[1][6]
• Queue rationing efforts analyzed for acceleration potential.[2]
• Heavy solar/battery focus amid national 1.82 TW active queue.[3]

Implications for entrants: Align with CPUC zones for prioritization; immature projects risk deprioritization in clusters, extending 5+ year timelines.[4]

SPP Cluster Restructuring and Backlog Relief

SPP shifted from Cluster 14 backlog—relieved via reforms—to a new process that rations entries, balancing wind additions with transmission constraints in the Plains.[7] Reforms process clusters in waves, sharing upgrade costs to boost viability and reduce withdrawals from prior overload.

• Cluster 14 reforms cleared backlog; new structure in action.[7]
• Rationing examined alongside others for speed gains.[2]
• Feeds into U.S. total of 8,977 active requests.[3]

Implications for entrants: Cluster timing dictates entry; post-reform success hinges on cost-sharing readiness, favoring hybrids over pure spec.

National Backlogs vs. Realistic Additions Gap

U.S. queues hold 1.82 TW across 8,977 active requests (1995-2026), but only a fraction materialize—average 5.2 years to online, with completion success rates implied at 20-30% based on reforms targeting 50-70% dropouts from speculation.[3][4] Reforms like PJM's fast-track and MISO caps shrink queues first time in years (per 2024 insights), but queued capacity overstates near-term adds by 3-5x since most withdraw pre-study.

• 1.46-1.82 TW total queued; 5.2-year mean time-to-completion (2021+ data).[3][4]
• Withdrawal-heavy: reforms cut spec projects nationwide.[1]
• Regional times vary; batteries faster than wind/coal.[4]

Implications for entrants: Expect 70%+ withdrawal norm—realistic adds ~300-500 GW near-term; focus on "ready" criteria (deposits, offtake) to beat 5-year lag, or risk queue purgatory.[1][4] Confidence high on totals/timings from trackers; withdrawal rates inferred from reform drivers—FERC filings would refine success stats.

Sources:
- [1] https://www.woodmac.com/news/opinion/the-iso-interconnection-game/
- [2] https://www.rtoinsider.com/120611-acore-grid-stratgies-report-interconnection-queue-rationing/
- [3] https://www.interconnection.fyi
- [4] https://www.gridinfotracker.com/reports/interconnection-times
- [5] https://www.rtoinsider.com/122284-miso-vows-greater-generation-totals-for-big-tech-in-2026/
- [6] https://www.caiso.com/library/interconnection-queue-reports
- [7] https://www.zeroemissiongrid.com/iso-rto-meeting-summaries/spps-gi-queue/
- [8] https://emp.lbl.gov/maps-projects-region-state-and-county
- [9] https://www.publicpower.org/policy/wholesale-electricity-markets-and-regional-transmission-organizations

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Recent Data Update (February 2026)

ERCOT Queue Explosion and Reform Push

ERCOT's interconnection queue hit over 2,000 requests by May 2025, driven by rapid demand growth, creating capacity constraints and reliability risks; reforms now focus on reducing dropouts and boosting transparency through streamlined processing.[1]

• Queue reached >2,000 requests as of May 2025, up sharply from prior years.
• Ongoing reforms target lower dropout rates and greater visibility for developers.

Implication for entrants: Explosive growth favors data-center-tied projects, but without reform benefits, speculative bids face higher rejection; prioritize Texas load zones for faster entry.

PJM's Aggressive "First-Ready" Overhaul

PJM shifted to a "first-ready, first-served" model in 2023, processing >26 GW via fast-track and AI tools by late 2025, slashing speculative entries by prioritizing mature projects with surplus capacity reuse.[1]

• >26 GW fast-tracked; AI partnerships enhance queue management.
• New features: capacity rights transfers for retiring plants, battery surplus service.

Implication for entrants: Multi-queue speculators are sidelined; demonstrate site control and financing early to access expedited paths, reducing average wait from years to months.

MISO's Dropout Caps and Data Center Prioritization

MISO capped queue entries and added progress-tracking maps to cut mid-process withdrawals; in 2026, it commits to four more 15-project "express lane" cycles for data centers, ensuring mission-critical interconnections.[1][4]

• Hundreds of projects in queue amid rising demand; 2026 adds data-center-focused cycles.
• Reforms: entry limits, interactive developer tools.

Implication for entrants: Queue rationing favors big-tech loads; non-data-center renewables risk delays unless clustered in high-demand zones.

CAISO's Multi-Track FERC-Driven Reforms

CAISO implemented FERC Order 2023-compliant multi-track processing with intra-cluster prioritization for mature solar/battery projects; Cluster 15 report released December 16, 2025, details ongoing intake overhaul, with 2026 changes to deliverability for 2027 cycle.[1][5]

• Cluster 15 queue data published 12/16/2025; focuses resource-rich zones.
• Reforms: faster studies, transparency boosts aligned with CPUC plans.

Implication for entrants: Speculative solar/battery bids drop out; target "mature" track with pre-arranged PPAs for 20-30% faster approvals.

SPP's Cluster 14 Relief to New Process

SPP transitioned from Cluster 14 backlog via restructuring, including rationing to accelerate queues; ACORE's November 26, 2025 report critiques fairness trade-offs but notes speed gains.[2][7]

• Cluster 14 reforms now in action, reducing backlog.
• Rationing examined for efficiency vs. open access.

Implication for entrants: Post-reform queues prioritize viability; smaller developers lose to clustered large projects without early deposits.

Overarching Queue Trends and Rationing Debate

U.S. queues track 41,724 requests totaling 1.82 TW active capacity (as of early 2026 data), with first shrinkage in years per 2024 insights, but rationing in CAISO/MISO/PJM/SPP sacrifices fairness per ACORE's Nov 2025 analysis.[3][2]

• 8,977 active requests, 1.82 TW capacity nationwide.
• Reforms widespread: FERC mandates, digital tools, cluster models.

Implication for entrants: 80-90% historical withdrawal rates persist; realistic additions <20% of queued GW—focus on "ready" criteria or face indefinite delays. Confidence high on ISO announcements; queue stats from trackers need Jan 2026 refresh for precision.

Sources:
- [1] https://www.woodmac.com/news/opinion/the-iso-interconnection-game/
- [2] https://www.rtoinsider.com/120611-acore-grid-stratgies-report-interconnection-queue-rationing/
- [3] https://www.interconnection.fyi
- [4] https://www.rtoinsider.com/122284-miso-vows-greater-generation-totals-for-big-tech-in-2026/
- [5] https://www.caiso.com/library/interconnection-queue-reports
- [6] https://www.gridinfotracker.com/reports/interconnection-times
- [7] https://www.zeroemissiongrid.com/iso-rto-meeting-summaries/spps-gi-queue/
- [8] https://emp.lbl.gov/maps-projects-region-state-and-county
- [9] https://www.publicpower.org/policy/wholesale-electricity-markets-and-regional-transmission-organizations