Approximately 858 GWdc of solar and over 1 TWh of batteries are in development


As the nation’s power grid electricity generation project queues continue to grow, its composition is evolving. Solar and batteries are beginning to dominate the nation’s energy future.

The US Department of Energy’s Lawrence Berkeley National Laboratory’s Electricity Markets and Policy group (EMP) has released their annual power grid queue update. The nation’s queue holds over 1 TWac of generation capacity. The new capacity added to the queue this year exceeds 600 GWac and comes from more than 3,000 unique projects.

Solar photovoltaics in the queue totals 676 GWac/~845 GWdc of capacity at the end of 2021. 85% of the new capacity came from solar plus energy storage facilities. Solar coupled with energy storage now totals more than 285 GWac of capacity in the queue.

Essentially, the utility scale California solar power market is now a solar-plus-storage market. In total, there is more than 400 GW of energy storage capacity in the queue.


The EMP team notes that the number of hours of energy storage is not available. This author estimates that the average battery has at least two and a half hours of storage capacity, which would put the total hours of capacity beyond one terawatt hour.

80% of the total solar capacity is scheduled to come online before the end of 2024; however, only 13% of all solar projects have a signed interconnection agreement. The report points out that in some markets, interconnection is secured before a project finds an off taker. In these markets, some projects that get approved for interconnection do not get built.

This point is brought home when the full sample is shared and we see that almost three times as many projects are withdrawn than are operational:

  • 8,133 “active” projects
  • 12,585 “withdrawn” projects
  • 3,439 “operational” projects
  • 229 “suspended” projects

The completion rate of solar, across all regions, is 16% — lower than the national average.

And if we’re doing analogies, the proof is in PJM’s pudding — the grid management group states that they are overwhelmed with solar power and wind applications, and that they propose to shut down all new interconnection applications for the next two years as they reassess their processes.

From 2015 through 2021, the report sees that the time it takes to get from from submission, to interconnection, to approval for interconnecting has increased sharply to greater then 3 years — except in Texas’ ERCOT territory.

Among all of these challenges, one statistic shines a light. Last year, pv magazine USA reported that the current queue already meets 85% of the estimated 1.1 TWac of capacity needed to clean our power grid. EMP’s report, released this year, confirms that number.

Additionally, the volume of capacity covered in this document only includes utility scale projects from 85% of national utilities. For instance, the hundreds of megawatts of capacity being deployed in Hawaii, the gigawatts of New York Community distributed solar, and the Massachusetts’ behind the meter market, are not counted.

At a minimum, 6.6 GW of the capacity deployed in 2021 would not have made the list.



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