Interconnection filings across the US grid operators.
All
ISO-NE147
FERC116
MISO89
PJM50
NYISO43
CAISO19
SPP19
ERCOT16
MISO
04 Dec 2026
MISO issues Large Load modeling requirements for 50 MW+ loads and computational loads (BPM-03X)
MISO’s Business Practices Manual for Large Loads says Large Load facilities are those with “Demand of 50 MW or more” at a single substation behind one or more points of withdrawal, while “Computational Load” is a subset with “25 MW or more of Demand from information technology equipment.” The manual
ISO-NE
10 Nov 2026
ISO-NE agenda includes integration of large loads (Nov. 10, 2026)
At ISO New England’s November 10, 2026 open board meeting, the agenda included management reports on “Integration of Large Loads,” signaling policy discussion relevant to large-load interconnection in Massachusetts and the ISO-NE footprint.
ISO-NE
04 Nov 2026
ISO-NE NRG proposes restoring auction-result transparency in CAR-SA amendment (CAR-SA Amendment)
In an ISO-NE CAR-SA amendment filing dated November 4, 2026, NRG says ISO-NE is proposing to change capacity market disclosure rules by masking auction results and publishing them in Maximum Capability terms instead of MRIC: “With the shift from QC→MRIC, ISO is proposing to mask auction results” and
ISO-NE
03 Nov 2026
ISO-NE proposes tariff revisions for New England large-load show cause order (EL26-72)
ISO New England’s Nov. 3, 2026 presentation says it is responding to FERC’s June 18, 2026 large-load show-cause order in EL26-72, with tariff redlines and implementation dates for the application/study process and transmission services. ISO-NE says the revisions create new large-load tariff definiti
ISO-NE
03 Nov 2026
ISO-NE PTO-AC proposes large-load cost recovery tariff revisions (nepool transmission committee)
ISO-NE PTO-AC presented proposed tariff revisions for large-load cost recovery in New England, saying the changes are intended to "Prevent transmission cost shifting to existing customers" and "Ensure full recovery of Large Load transmission upgrade costs." The committee is also requesting a vote on
MISO
MISO stakeholders flag Large Load cost-shifting risk in MTEP26 draft (no docket)
According to Midwest Large Energy Consumers (MLEC), MISO’s draft MTEP26 includes 26.6 GW of Large Load related integration with estimated costs above $5.2 billion. MLEC says the issue sits in the context of “FERC’s Show Cause order related to preventing cost shifting while interconnecting Large Load
ISO-NE
ISO-NE proposes tariff revisions for large-load show cause order response (EL26-72)
ISO New England says its filing responds to a FERC show-cause order and would change large-load tariff treatment by creating “Interim Contract Demand Service” and “Non-Firm Contract Demand Service,” with large loads on those services excluded from the Installed Capacity Requirement and related value
ISO-NE
ISO-NE proposes tariff revisions for New England large load show cause order (EL26-72)
ISO New England says its tariff package is the ISO and PTO response to FERC’s June 18, 2026 show-cause order, with proposed implementation dates of June 1, 2027 for the application and study process and June 1, 2028 for transmission services. The presentation says the filing will go to the Commissio
ISO-NE
30 Oct 2026
FERC ISO New England answers Moraga Storage complaint over TCS cost allocation (EL26-112-000)
In a FERC filing in EL26-112-000, ISO New England says the Transitional Cluster Study and its cost-allocation methodology were consistent with the tariff and that the Commission should deny Moraga Storage’s complaint. ISO-NE states that the TCS began on August 11, 2025 and ended with the Final TCS R
ISO-NE
30 Oct 2026
ISO-NE updates large-load integration, interconnection cluster study, and FERC compliance work (October 2026 monthly memo)
ISO New England’s October 30, 2026 memo says large-load integration is a top-priority initiative in its 2027 work plan, alongside FERC Order No. 1920 compliance and transmission planning. ISO-NE also reported ongoing work in response to FERC's Large Load Show Cause Order, including “a new interconne
ISO-NE
30 Oct 2026
ISO New England denies Moraga Storage complaint over TCS and cost allocation (EL26-112-000)
ISO New England’s answer in EL26-112-000 says the Commission should deny Moraga Storage’s complaint and that the TCS was conducted under the Tariff and PP5-6. ISO says the Transitional Cluster Study began on August 11, 2025 and ended with the Final TCS Report on August 6, 2026, and that all 23 TCS p
ISO-NE
ISO-NE presents New England large load tariff revisions for EL26-72 (EL26-72)
ISO New England’s presentation on the New England Large Load Show Cause Order (EL26-72) says the ISO and Participating Transmission Owners are responding to FERC’s June 18, 2026 show cause order. The proposed tariff revisions would exclude large loads receiving Interim Contract Demand Service or Non