Summary
Every interconnection queue entry carries a date its developer expects to start operating. When that date passes and the project is still listed as planned, the megawatts it promised are late. We counted them in all seven ISO and RTO queues.
- 161,870.5MW past due
1,079 planned queue projects list an in-service year before 2026 and are still waiting to be built.
- 93%in MISO and PJM
MISO and PJM together hold 150,463.3 MW of the past-due total.
- 28.9%of MISO's queue
is past due, the highest share of any grid. PJM is next at 24.4%. ERCOT's share is 0.6%.
- 744median days late
186 projects were due in 2022 or earlier. 381 were due in 2025.
- 51.7%is solar
83,767.1 MW of solar across 605 projects is past due. Battery Storage adds 27,559.3 MW.
- 31.9%has a named developer
Invenergy (7,549 MW) and NextEra Energy (7,273 MW) hold the most past-due MW.
- 1,020slipped again
queue projects pushed their dates later between June 4, 2026 and October 8, 2026, by a median of 182 days. See the change feed.
MISO and PJM carry the backlog
MISO has the most past-due MW, 86,980.3 MW across 567 projects, and the highest share of its queue: 28.9%. PJM follows with 63,483 MW across 413 projects, 24.4% of its queue.
ERCOT's queue is the largest of the seven at 532,205.3 MW planned, yet only 0.6% of it, 3,099.3 MW, is past due. The other 5 queues together hold 11,407.2 MW.
Past-due projects and MW by grid
Seven ISO and RTO queues
| Grid | Past-due projects | Past-due MW | Planned MW | Share past due |
|---|---|---|---|---|
| MISO | 567 | 301,375.8 | 28.9% | |
| PJM | 413 | 260,258.9 | 24.4% | |
| CAISO | 41 | 186,183.7 | 3.3% | |
| ERCOT | 29 | 532,205.3 | 0.6% | |
| SPP | 22 | 129,365.8 | 1.6% | |
| ISO-NE | 5 | 16,920.2 | 0.2% | |
| NYISO | 2 | 44,448.4 | 0% | |
| All seven | 1,079 | 161,870.5 | 1,470,758 | 11% |
How late the late projects are
Most past-due MW was due recently. 66,013.4 MW was due in 2025 and another 48,259 MW in 2024. But 186 projects, 24,613.3 MW, were due in 2022 or earlier and are still in the queue as planned.
Past-due MW by the year it was due
1,079 projects. Labels show MW and project count.
View as table
| Due | Projects | MW |
|---|---|---|
| 2022 or earlier | 186 | 24,613.3 |
| 2023 | 212 | 22,984.8 |
| 2024 | 300 | 48,259 |
| 2025 | 381 | 66,013.4 |
Solar is 51.7% of it
Solar accounts for 83,767.1 MW of past-due capacity across 605 projects. Battery Storage is a distant second. Firm resources are a small part of the backlog: 45 natural gas projects, 2 coal projects and 1 nuclear project.
Past-due MW by technology
Top 8 technologies
View as table
| Technology | Projects | MW |
|---|---|---|
| Solar | 605 projects | 83,767.1 |
| Battery Storage | 197 projects | 27,559.3 |
| Wind | 99 projects | 16,790.6 |
| Natural Gas | 45 projects | 13,980.6 |
| Solar + storage | 74 projects | 10,821.2 |
| Transmission | 38 projects | 4,309 |
| Nuclear | 1 project | 2,709.8 |
| Coal | 2 projects | 1,366 |
Illinois and Indiana lead the states
Illinois has 124 past-due projects and Indiana 124. Virginia, home to the Loudoun County data center cluster, is third with 14,764.2 MW late.
Past-due MW by state
Top 10 states
View as table
| State | MW |
|---|---|
| Illinois | 26,441.4 |
| Indiana | 22,755.7 |
| Virginia | 14,764.2 |
| Michigan | 13,799.6 |
| Arkansas | 7,893.3 |
| Ohio | 7,755.8 |
| Pennsylvania | 7,597.9 |
| Wisconsin | 6,530.2 |
| Louisiana | 6,133.9 |
| Missouri | 6,116.4 |
County pages: browse every county.
Who owns the late projects
The queues name a developer for 31.9% of past-due MW. Among those, Invenergy holds the most at 7,549 MW, and NextEra Energy is next at 7,273 MW. NextEra Energy has more past-due projects, 48 against Invenergy's 40.
Developers with the most past-due MW
Top 10 named developers
View as table
| Developer | MW |
|---|---|
| Invenergy | 7,549 |
| NextEra Energy | 7,273 |
| Ranger Power | 2,245 |
| EDP Renewables | 2,188.4 |
| RWE | 1,943.6 |
| AES Clean Energy | 1,830 |
| Arevon | 1,800 |
| Apex Clean Energy | 1,668.6 |
| Geronimo Power | 1,632 |
| Lightsource bp | 1,482.2 |
Methodology
How we define past due
- Universe
- Planned projects in the ERCOT, PJM, MISO, CAISO, NYISO, ISO-NE and SPP interconnection queues, data as of October 8, 2026. Operating, cancelled and withdrawn projects are excluded.
- Past due
- The listed in-service year is before 2026, the snapshot year. A project due later in 2026 is not counted.
- Days late
- Days past the listed in-service date. The median past-due project is 744 days late.
- Share of queue
- Past-due MW divided by all planned MW in the same queue.
- Developer
- The developer named in the queue record. Unnamed projects stay in every total and drop out of the developer ranking.
Get the report and the data
The dataset is the full list of 1,079 past-due projects, with names, developers, counties and dates, ready for Excel. It is included with Solo and Unlimited; Solo exports up to 1,000 rows a month.
Every past-due project
Queue ID, name, developer, county, grid, MW, listed in-service date and days late.
| Project | Developer | Grid | State | MW | Due | Days late |
|---|---|---|---|---|---|---|
Included with Solo and Unlimited. Solo exports up to 1,000 rows a month.