MISO Turns to Batteries: Why Storage is Poised to Take Off in MISO

In recent years, solar has dominated headlines as the leading renewable energy resource across the MISO power markets. Beneath the surface, however, battery storage is steadily gaining traction, especially as system needs shift from sheer production needs to flexibility and real-time response capabilities. Historically, BESS faced structural and economic disadvantages in MISO, including high capital costs, limited discharge durations, delayed market access, and a surplus of low-cost dispatchable generation. These challenges sidelined battery storage in favor of wind and solar, even when developers recognized its future potential.

Today, that tide is turning. As MISO transitions its resource mix and reforms its market design, BESS is emerging as a key asset with distinct operational and economic value. This article explores how we got here and why MISO may soon become a battery-first market.

Weak Revenue Signals: In the last decade, BESS projects struggled to pencil out in MISO. According to the Midcontinent Clean Resource (MCR) white paper, the levelized cost of energy (LCOE) for 4-hour solar-plus-storage systems ranged from $81 to $140/MWh, well above the average wholesale market prices of approximately $30/MWh in MISO. By contrast, wind and gas-fired generation offered LCOEs between $23 – $54/MWh. This cost gap in the energy markets, combined with the lack of robust ancillary service and capacity revenues, made it difficult for developers to justify investments in standalone storage projects.

Short Discharge Durations: Most in-service batteries in MISO prior to 2020 had 2-hour durations or less, limiting their ability to provide meaningful peak shaving or firm capacity. Without the duration to participate in capacity markets, BESS assets were not viewed as significant revenue-generating assets.

Delayed Market Participation Rules: Although FERC Order 841 in 2019 directed RTOs to integrate storage resources into their markets, implementation in MISO lagged. Slow technology rollouts, incomplete tariffs, and lack of clarity around participation pathways delayed the ability of BESS to earn revenue through energy and ancillary markets. In fact, MISO did not fully implement Order 841-compliant participation models until 2022.

An Abundance of Dispatchable Generation: During this period, MISO’s reliability needs were largely met by inexpensive and abundant dispatchable thermal generation. These coal and combined-cycle gas resources could ramp quickly, absorb system variability, and maintain reliability without needing battery support. In this context, there was little operational urgency or market signal to drive investment in storage assets.

Faster Interconnection for Storage Assets: In response to growing concerns about system adequacy, MISO has proposed new fast-track pathways for certain standalone BESS projects. These reforms aim to accelerate interconnection timelines by reducing study requirements for qualified battery projects that do not introduce new capacity or congestion risks. Modeled loosely on CAISO’s and ERCOT’s expedited frameworks, this proposal aims to propel near-term storage deployment without overloading MISO’s interconnection queue. For developers and asset owners, this reform could be a critical opportunity for high-value seasonal capacity and ancillary service revenues.

Standardized BESS Performance Requirements: As inverter-based renewables expand, MISO is grappling with a decline in system inertia, voltage support, and frequency response. To address these reliability concerns, MISO is actively developing standardized performance and testing requirements for grid-forming battery energy storage systems.  This framework will establish qualification benchmarks for batteries that can emulate key performance behaviors, including:

• Autonomous voltage control
• Fast frequency response
• Black-start functionality

By clearly defining the performance standards, MISO is creating new value streams for BESS, well beyond energy market arbitrage.

MISO’s implementation of a Reliability-Based Demand Curve (RBDC) in its capacity market has strengthened price signals for new flexible BESS resources. Capacity prices in the 2025/26 Planning Resource Auction reached historic highs in multiple zones, driven by tightening supply and demand dynamics. BESS assets, particularly those with longer duration capabilities, are now positioned to:

• Provide qualifying firm capacity
• Dispatch strategically during seasonal peak windows
• Offer flexibility in ancillary services markets

As capacity market participation becomes more critical, BESS may become not just a preferred option, but a necessary asset class for meeting market obligations in MISO.

While MISO’s BESS policy momentum is real, success in this evolving market requires operational readiness. Asset owners must navigate:

• Market registration and telemetry configuration
• Automated dispatch for price and signal response
• Compliance with new operational standards (such as those modeled after Section 502.14 in Alberta)

BESS has moved from a supporting to a leading role in MISO’s evolving grid. Developers, investors, and asset owners who understand this shift and are operationally ready to act will be best positioned to capture the next phase of value. SYSO offers the technical expertise, regulatory fluency, and operational infrastructure to help storage projects lead in a reliability-driven market. SYSO helps BESS owners meet these market demands through end-to-end market integration, 24/7 NOC monitoring, and asset optimization strategies tailored to evolving MISO protocols. Contact our team today for a MISO market evaluation.