MISO Proposes Reliability Requirements for Data Centers and Other Large Loads

By chasecodewell // 2026-09-10

Mastodon

Parler

Gab

Copy

The Midcontinent Independent System Operator (MISO) has filed a proposal with the Federal Energy Regulatory Commission (FERC) to establish new reliability requirements for data centers and other large electricity consumers connecting to its grid. The filing, submitted in late August, outlines a framework designed to improve the grid operator's visibility into the behavior of large loads that can significantly impact system stability. [1] The proposal targets facilities defined as "large loads" that exceed 50 megawatts (MW), with a separate classification for "computational loads" that include at least 25 MW of demand from information technology (IT) equipment such as servers, storage, and networking hardware. In its filing, MISO stated that the framework is intended to "improve visibility into large load characteristics and behavior, support reliable planning and operational decision-making, and establish scalable and technically justified expectations proportional to demonstrated reliability risk.” [2]

Regulatory Context and Industry Actions

MISO's proposal is a direct response to FERC's mid-June "show cause" orders, which directed major grid operators to develop rules for interconnecting large loads after the commission found existing procedures inadequate. [3] The grid operator, which manages the power system from Louisiana to Minnesota, says it will file additional proposals by a Nov. 16 deadline. [1] The filing follows similar actions by other grid operators, including the Electric Reliability Council of Texas (ERCOT) and PJM Interconnection, according to MISO officials speaking with Utility Dive. [2] These efforts come after a series of incidents where data centers tripped offline suddenly, raising concerns about grid stability. On July 22, a transmission fault in Northern Virginia caused approximately 3,800 MW of data center load to disconnect from the PJM system in the region's largest such event. [4] MISO officials point to a significant shift in electricity demand patterns. The grid operator told FERC that electric demand grew relatively flat between 2009 and 2024, at roughly 0.5% annually. MISO now projects annual growth of 1% to 2% through 2044, with higher rates expected in the near term. [2]

Key Definitions and Scope of the Proposal

Within its filing to FERC, MISO has established two distinct categories to classify new large power consumers. The broader category, "large loads," encompasses any facility consuming more than 50 MW of electricity. [2] The second category, "computational loads," is a subset that includes large loads with at least 25 MW drawn specifically from information technology hardware, according to the filing. [1] MISO officials said the separate classification allows the grid operator to apply more targeted rules to data centers, which present unique operational risks. "Computational loads may exhibit rapid and coordinated changes in demand, significant power-electronic behavior, and distinct responses to transmission system disturbances," MISO stated in its proposal. [1] The proposed requirements would apply to transmission customers taking service on behalf of large loads, establishing obligations that are a precondition for interconnection to the MISO system. The framework is structured around four principal areas, according to documents filed with FERC. [2]

Four Main Areas of the Proposed Framework

The first substantive component of MISO's proposal addresses visibility. Transmission customers would be required to provide basic information and modeling data on large load facilities, along with day-ahead and real-time load forecasts. MISO said the information is needed "to support planning studies, operational assessments, and accurate representation of large loads behavior and system impacts." [1] The second measure mandates Phasor Measurement Units (PMUs) for computational loads. These devices provide high-resolution, time-synchronized monitoring data that MISO says gives operators "greater visibility into facility behavior during system disturbances and rapid operating changes."[1] The third area imposes ramp requirements that limit the rate at which computational loads can increase or decrease electric consumption during steady-state transitions. "Managing rapid changes in demand helps reduce real-time supply-demand imbalances, sudden [changes] in transmission power flows, and associated operational impacts," MISO told FERC. [1] Data centers present challenges in this respect due to variations in workload that can create sudden changes in power demand, requiring the grid to have sufficient flexibility and reserves to maintain frequency and voltage stability. [5] Finally, the proposal establishes ride-through requirements that set minimum disturbance performance standards for voltage and frequency events. MISO said these measures reduce the risk of "unnecessary disconnection or customer-initiated rapid reductions in demands during system events." [1]

Grandfathering, Effective Date, and Next Steps

MISO's proposal includes grandfathering provisions designed to provide regulatory certainty to existing or nearly completed commercial arrangements for large loads. [1] The grid operator has requested that FERC approve the proposal to take effect on December 4. [2] Beyond the current filing, MISO has indicated it will submit additional large load-related proposals by the Nov. 16 deadline. These future filings, MISO said, will address additional transmission products and associated study processes, protections against cost shifts, and the treatment of generation service to electrically proximate large loads. [1] In its filing, MISO emphasized that the framework is calibrated to match reliability expectations to the risks presented by different types of loads. The grid operator said it aims to set "expectations proportional to demonstrated reliability risk." [1] The proposal will now undergo review by FERC, which may approve, reject, or modify the proposal after a public comment period. [2]

Grid Operators Must Adapt Interconnection Rules Due to Electricity Demand Driven by Data Center Expansion

MISO's filing represents a substantive attempt by one of the nation's largest grid operators to adapt interconnection rules to a new era of electricity demand driven by data center expansion. The proposal comes at a time when grid operators across the country are scrambling to maintain reliability amid rapid load growth projections. [2] [6] The specific requirements, covering data visibility, monitoring equipment, ramp rate limits, and disturbance ride-through capabilities, target the operational characteristics that distinguish modern computational facilities from traditional industrial electricity consumers. [1] As FERC considers the proposal, the outcome will establish a precedent for how grid operators across the country manage the integration of large loads while maintaining system stability. [2]

References

Ethan Howland. "Second Largest US Grid Operator Proposes Reliability Rules For Data Centers". ZeroHedge. September 2, 2026.
Ethan Howland. "Large loads face reliability requirements under MISO proposal". Utility Dive. September 1, 2026.
Utility Dive. "Microsoft, PowerHouse Hillwood dispute data center service agreements". September 1, 2026.
Utility Dive. "PJM eyes data center, crypto reliability requirements after 3.8 GW of load trips offline". August 12, 2026.
EnerNex. "Large loads, new rules". Utility Dive. September 8, 2026.
NaturalNews.com. "Goldman Sachs warns US power grid nearing collapse as AI and EVs overwhelm aging infrastructure". June 6, 2025.