Brattle Says a Single SPP Utility Could Stack 90 MW of Demand-Side Capacity by 2030

Brattle Says a Single SPP Utility Could Stack 90 MW of Demand-Side Capacity by 2030 A Brattle report for Uplight argues demand response, efficiency and time-of-use pricing can lift one Southwest Power Pool utility's flexible load to 5% of system peak. A Brattle Group report published Wednesday (2026-06-03) found that a single "representative" utility in the Southwest Power Pool could unlock an additional 90 MW of demand-side capacity by 2030 by stacking demand response, energy efficiency and time-of-use rates. The study, prepared for software firm Uplight, calls the approach a "demand stack" and frames it as a repeatable template rather than a one-off program.⁷ That matters because the grid is short of supply at the exact moment load is accelerating. The IEA estimates US data centers now account for about half of the country's incremental demand growth, and demand-side capacity is one of the few levers a utility can pull without waiting years for new generation or transmission.^4,7 Brattle's numbers are granular enough to test. Enrollment-focused strategies alone deliver up to 53 MW of incremental demand response for the model utility, the report found.⁷ Layering in managed EV charging, distributed batteries and strategic interconnection — drawn from a separate Brattle study for the Utilize Coalition earlier this year (2026) — lifts the representative utility's demand-side capability by 66 MW, on a modeling assumption of a 10% increase in grid utilization.⁷ Two further moves, improved forecasting and staggered asset dispatch, add another 23 MW.⁷ Put together, Brattle reckons the flexible portfolio reaches roughly 5% of total system load, up from 3% under a status-quo case.⁷ That two-percentage-point gain reads modest until you weigh it against the cost of the alternative. The IEA has said meeting expected power demand growth through 2030 would require boosting annual grid investment by about 50% from $400 billion.⁶ Demand-side capacity is cheap by comparison, and it can be enrolled in a single tariff cycle rather than a decade-long build. But the headline figure rests on a model utility, not a real one. Brattle's "representative" SPP utility is a construct, and the 90 MW depends on enrollment rates, customer behavior and a 10% utilization improvement that the report assumes rather than observes.⁷ Demand response has a long history of looking better on a spreadsheet than on a hot August afternoon when customers opt out. The timing argument is the stronger part of the case. US regional grid operators have asked FERC for an extension on deadlines to upgrade transmission, and Quartz has reported engineers describing permitting, supply chains and interconnection queues that cannot match the speed of data center growth.^5,4 Against that, a tool that shaves peak load within a year or two has obvious appeal to a planner staring at a stalled interconnection queue. Battery storage, the other near-term flexibility option, is running into its own constraints. BloombergNEF panelists in April (2026) said high battery pack prices, shipping bottlenecks and supply-chain limits are dampening near-term deployments even as utility demand stays strong.³ If steel-in-the-ground flexibility is hard to source, a software-and-tariff stack that uses existing customer load becomes more attractive by default. The demand picture Brattle is responding to is not subtle. The IEA expects US power demand to grow at a 3.6% annual average rate between 2026 and 2030, driven by industry, EVs, air conditioning and data centers.⁶ EIA's Annual Energy Outlook 2026 projects data center server electricity use climbing to between 22% and 33% of commercial building consumption by 2050, from about 7% in 2025.² For SPP, sitting across the wind-heavy central US, flexible load also helps absorb variable renewable output rather than merely clipping peaks. The IEA forecasts renewable generation growing by roughly 1,000 TWh a year through 2030, with solar alone above 600 TWh.¹ A demand stack that can shift consumption toward those hours is worth more than its nameplate megawatts suggest. The signal to watch is whether any actual SPP utility adopts the framework and files it in a rate case or integrated resource plan. Brattle has now produced two reports making the case in modeled terms.⁷ Until a real utility books the 90 MW against a real peak, it remains a well-argued forecast rather than capacity on the system.