Natural Gas Capacity Ratings by U.S. Metro

As of November 2026, Discovery Energy rates six areas High: Boston (take stations with a negative peak-hour balance every winter in Boston Gas's own analysis), Detroit and Grand Rapids (no spare supply on a January 2027 peak day in DTE Gas's plan), Pittsburgh (thin margins at both gas utilities and a new pipeline lateral under construction), Salt Lake City area (a gate station projected at 100 percent of capacity in 2026-27 in the utility's own plan), Chicago (a 3% coldest-day margin and one storage field at about 26% of the design day) and Poughkeepsie-Newburgh (two local gas systems loaded above 100% in 2024 with no approved or scheduled reinforcement). It rates 27 areas Elevated: Atlanta (an approved 5% reserve margin plus extra capacity, with a pipeline slipping a year), York (a margin below 5% before new capacity arrives), Raleigh (a stated -1.71% design-day reserve margin for 2026-27, before new supply arrives), Houston (a shrinking reserve and two large pipeline contracts ending in 2027), Pennsylvania's UGI Gas territory (a thin peak-day margin and a supply line the record does not show as contracted), Las Vegas (a resource shortfall expected from the 2026-2027 gas year and replacement capacity not shown as signed), Kansas City (reserve margins below 5% from 2026-27 with no added capacity planned), Lansing (no spare supply on a January 2027 peak day and two winter pipeline contracts ending by October 2028), Miami (the utility's statement that it lacks enough primary capacity for its coldest day, with a fix due in late 2028), Minneapolis (a thin 2026-27 reserve margin), New York City and Westchester (a design with no reserve margin and delivered services covering 4% of peak demand), Northern New Jersey (design day supply only 4.7% (PSE&G) and 4.0% (Elizabethtown Gas) above requirements), Southern California (a projected cold-day shortfall at the authorized Aliso Canyon inventory with no approved or scheduled fix), Charlotte (a projected design day shortfall against Piedmont's own 5% reserve target from winter 2027-28), St. Louis (a thin 2027-28 reserve margin with no added capacity planned), Brooklyn, Queens, Staten Island and Long Island (a downstate system the Commission calls fragile, with a forecast supply shortfall), Cincinnati (planned lines listed only as Proposed for 2028 to 2033, with curtailment as the stated consequence of deferment), Portland and Salem (a design day deficit met by storage recalls, with a larger recall scheduled for 2027-28), Worcester (a design day deficiency projected in each of five years, mostly on the pipeline that serves Worcester), Buffalo (a margin below 5% in the utility's figures, although it reports ample capacity), Denver (a supply project the utility says is needed, with its certificate declined by the Colorado PUC), Hampton Roads (all upstream capacity needed on a peak day, with the approved compressor station due only in November 2027), Northern California (a 3.7% reserve on the 1-in-10 winter peak day for 2026-27), Philadelphia (a firm gap between total assets and design day demand that the utility meets with delivered supply), Rochester (a margin below 5% in 2026 in the utility's own tables), Seattle (area supply systems below design requirements on a peak demand event with no approved or scheduled fix) and Albany (falling delivery pressure on the Albany Loop and a paused fix). It rates St. Paul, Milwaukee and Boise and Idaho Falls Watch and Spokane Stable. These ratings describe the public record of capacity and supply risk and are not forecasts of outages; the ratings table lists every metro.

Elevated means a utility's own figures show a thin margin, or the system or a facility at or beyond its limit, before an approved or scheduled fix arrives, or a need has no approved fix. High means shortfalls are projected in several years or at several facilities, a key supply contract has no decided replacement, or an Elevated base level is raised by two or more documented risk factors. In a shortage, interruptible customers are first in line, as each utility's tariff provides. The ratings are not forecasts of outages and do not describe any one customer's service.

Documented new large gas loads appear in three areas: Pittsburgh (a National Fuel pipeline lateral for 205,000 Dth per day to the Shippingport Power Station, with construction under way), Salt Lake City area (Enbridge Gas Utah reports three signed data-center or onsite-generation agreements as of June 2026, with no gas volume stated for any) and Milwaukee (Oak Creek gas turbines approved to serve Microsoft's Mount Pleasant data center campus, scheduled for service in August 2028). In Chicago, an Indiana order approved 2,600 MW of gas-fired generation at one site for a data center customer, but no filing read ties them to a pipeline serving the utility, so they are reported and not counted. In Houston, the U.S. Energy Information Administration lists three planned gas-fired generators, but no filing read ties them to a pipeline serving the utility, so they are reported and not counted. In Denver, the Colorado PUC's decision says the project would also support gas demand for 400 MW of new Company-owned gas combustion turbines, without a location or service date, so it is reported and not counted. In Buffalo and Albany, the New York Independent System Operator's load list shows data center entries (Buffalo: eight in the two Buffalo-area counties and Albany: one in the five Albany-area counties); the queue records electric load and does not say whether natural gas serves them, so they are not counted. The other case studies found no documented new large gas load inside their metros.

Discovery Energy uses only public utility and regulatory filings. Each fact is tied to a short quotation from the filing, and code confirms that the quotation appears in the saved source document. A fixed scale with written thresholds sets each level, and Discovery Energy's technical reviewer, Tara Dugger, reviews each case study before it is published.

Ratings are updated when new filings appear, such as supply plans, rate case decisions and project approvals, and at least once each heading into winter. The date on this page shows the latest update.

Start with three checks: your rate class and tariff, whether your service is firm or interruptible and what the curtailment terms say, and the charges billed to you. Discovery Energy reviews service elections, interruption terms and regulatory proceedings for organizations across the U.S. and Canada; you can schedule a review.