MISO proposes fast-track for zero-injection large load projects

Solmar Insights

The Midcontinent Independent System Operator (MISO) has put forward a proposal to streamline the interconnection process for generating projects serving large electric loads at the same substation and voltage level. Google, Xcel Energy, and other utilities, along with clean energy groups, voiced support for the initiative in recent filings to the Federal Energy Regulatory Commission (FERC), aiming to allow 90-day reviews for zero-injection resources with minimal transmission impact.

Details of the proposal

MISO’s Zero Injection Generator Interconnection Agreement focuses on projects that supply large facility loads, including colocated data center campuses and crypto mining operations, directly from the same substation without injecting additional net power into the broader grid. Under the proposal submitted on August 18, only resources with capacity less than or equal to the local load, and that require no network upgrades except adjacent substation protection facilities, are eligible for the faster 90-day study process.

The simplified approach is a response to mounting application volumes for data center and large-load client interconnections, and to a June 2026 FERC order which found RTOs lacked effective rules for integrating such users. MISO asserts that these zero-injection projects pose little risk to the transmission system and can therefore bypass the lengthy, often multi-year, standard interconnection study procedures.

MISO’s plan explicitly limits eligibility to resources that match the served load size, theoretically mitigating upstream grid impacts. The framework requires projects to comply with site-specific operational and market requirements but avoids costly and disruptive grid reinforcements beyond the site’s substation.

Industry and utility support

Major hyperscale data center operators such as Google, alongside utilities like Xcel Energy, have openly endorsed MISO’s revised interconnection approach. Filing jointly or individually, they stress the critical need for predictability and speed in large load project permitting, especially as digital infrastructure buildout accelerates throughout MISO’s footprint from Minnesota to Louisiana.

Broadly, supporters argue that the zero-injection track benefits both hyperscalers and utilities by enabling on-site renewable generation to be rapidly paired with new data or compute centers. The mechanism is expected to shorten delivery timelines, lower transaction and study costs, and make MISO more attractive for energy-intensive digital infrastructure investment when compared to other RTOs and ISOs.

The proposal also gained backing from several national and regional clean energy trade groups. They cite the importance of aligning interconnection policy with the proliferation of demand from data centers and other clustered large loads, without exposing general ratepayers to unnecessary reliability upgrades or cost shifts.

Concerns from advocacy groups

Despite broad industry approval, environmental organizations such as the Sierra Club and the Natural Resources Defense Council raised objections in recent FERC filings. While agreeing with the goal to foster colocated load and generation, they argue the present MISO proposal risks unfairly shifting some network costs onto existing utility customers, essentially subsidizing large new projects.

Critics further argue that the framework could fall short of ensuring emissions reductions or equity, urging the Commission to compel MISO to amend its design. These advocacy groups want a more comprehensive cost allocation structure and stronger protections against unintended cross-subsidies or grid constraints that could emerge from a rapid influx of large load resources.

Nonetheless, there is agreement from all parties, including those that oppose the current drafting, that future grid rules must better accommodate the unique dynamics of high-density data center growth and large point loads.

Regulatory context and next steps

MISO’s proposed zero-injection rule responds directly to FERC’s mid-June “show cause” order, which required MISO and other RTOs to propose new solutions for connecting large loads by mid-November. The proposal is the first developed by MISO’s Large Load Working Group, set up in anticipation of surging demand for high-capacity interconnections driven by data center and compute infrastructure expansion.

Under the plan, projects that qualify would avoid most of the regional transmission study requirements unless a system protection facility upgrade at a neighboring substation was necessary. The process would run in parallel to, but distinct from, MISO’s traditional generator interconnection queue, potentially offering a clearer and shorter path for hyperscale development and associated renewable procurement throughout the region.

FERC will now determine whether to approve, amend, or send back the proposal. The outcome will shape not only how quickly new data centers and compute loads come online but also influence which grid investments are required and who will ultimately bear those costs across MISO states.

Reporting via the original publisher