Elevated Costs Since Implementation

ISO‑NE’s Day‑Ahead Ancillary Services Initiative (DASI/DAAS) continues to generate significantly higher-than-expected ancillary-service charges, prompting escalating concern among suppliers, ratepayers, and state regulators. Monthly DASI costs have remained elevated since launch, driven by reserve scarcity pricing, winter gas constraints due to a colder than normal winter, and co‑optimization effects that simultaneously lift energy and reserve prices. The IMM’s February 2026 memo intensified scrutiny by concluding that DASI’s reserve‑penalty factors were “set at levels that materially exceed the marginal reliability value of reserves”, Contributing to inflated costs and distorted price signals. This memo is now a central reference point in stakeholder discussions and regulatory filings. The IMM goes on to recommend methods to mitigate these costs which have been over calibrated and cause the region to buy more capacity than it truly needs. No changes or developments are expected until fall 2026, but thankfully the $/MWH charge is trending lower than 2025 values. 

FERC Review and Market Outlook

At the federal level, DASI charges are under active review in a major FERC complaint alleging roughly $921 million in excess ancillary‑service costs relative to ISO‑NE’s original projections. FERC has not yet ordered refunds or tariff revisions, but the IMM memo has increased pressure on ISO‑NE to justify the design as “just and reasonable”. Meanwhile, ISO‑NE and NEPOOL committees are evaluating potential adjustments to reserve requirements, penalty factors, and settlement mechanics. Until FERC rules or ISO‑NE implements reforms, DASI charges continue to flow through settlements as filed, and retail customers across New England are feeling the impact.

Want to learn more about DASI and its impact on your energy costs? Read this article here.