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Of New Power Generation, How Much Is On The Roof? Annual Update — 2018

Last year saw the largest growth in new power generation capacity in the US in more than a decade — 34.7 gigawatts of new capacity came online. While growth across a mix of energy resources contributed to this jump, new gas plant development overshadowed all renewable energy sources, combined.

Originally published at

Last year saw the largest growth in new power generation capacity in the US in more than a decade — 34.7 gigawatts of new capacity came online. While growth across a mix of energy resources contributed to this jump, new gas plant development overshadowed all renewable energy sources, combined.

Whether communities can rein in the growth of these costly, centralized gas plants will have important implications for the future of local, renewable energy, as ILSR warned in a report entitled Reverse Power Flow, released last year.

Below are updated illustrations and analysis of national data on new power plant capacity, disaggregated by energy source. We present annual results from 2018 first, followed by more detail from the fourth quarter of last year, as part of our regular quarterly reporting.

Annual New Power Plant Capacity – 2018

In terms of annual capacity added, renewable power capacity continued to grow overall in 2018. Distributed or small-scale solar, utility-scale solar, and wind power all saw gains in capacity added, when compared to the previous year.

Small solar added a record total of more than 3.8 gigawatts or 11% of new capacity in 2018, as illustrated above — enough to power more than 750,000 homes. Utility-scale solar and wind saw steady growth with 4.9 and 6.6 gigawatts added respectively last year, more than was added in the previous year for either technology.

That said, a significant expansion in nonrenewable fracked gas plants overshadowed this growth in renewables in both raw and relative terms in 2018. Fossil fuel plants saw their largest share of new capacity added in more than a decade. Gas plants added more than 19 gigawatts of capacity last year — roughly 10 gigawatts more than 2017 — claiming a share of more than half of all new capacity.

Quarterly New Power Plant Capacity – 2018 Q4

In the last quarter of 2018, more than 14 gigawatts of new power generation capacity was added. Distributed solar saw more than 1 gigawatt added that quarter, its largest quarter of the year. Its share relative to growth in utility-scale solar, wind, and gas plants, however, dropped 10 percentage points to an 8% share of the quarter’s new power plant growth.

In addition to these trends, the end of 2018 also saw the first investor-owned utility, Xcel Energy, make a notable commitment to producing its power from 100 percent carbon-free energy sources by 2050, enabled largely by strong public policy.

As Xcel works toward its goal — despite contradictory news that the company now wants to purchase a new gas power plant in Minnesota — customers will want to keep asking three important questions to hold the corporation and other electric utilities accountable to making smart, long-term investments in local energy.

In addition to continuing to put pressure on incumbent utilities, communities are organizing and building power to challenge and transform the model of centralized power generation directly. For example, community members in Holyoke, Mass., shut down a fossil fuel plantand successfully fought to transition the site to a solar and storage facility — instead of converting it to a gas plant. Places like Puerto Rico are considering how community ownership of local, renewable energy can build wealth and greater resilience on the island.

These and other powerful stories from across the country illustrate ways to reverse the growth of new, centralized gas plants and to support local, renewable energy instead.

Interested in earlier trends and analysis of new power plant capacity? Check out our archive, illustrating how electricity generation has changed in previous quarters and years.

This article originally posted at For timely updates, follow John Farrell or Marie Donahue on Twitter or sign up to receive the Energy Democracy weekly update.

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Written By

John directs the Democratic Energy program at ILSR and he focuses on energy policy developments that best expand the benefits of local ownership and dispersed generation of renewable energy. His seminal paper, Democratizing the Electricity System, describes how to blast the roadblocks to distributed renewable energy generation, and how such small-scale renewable energy projects are the key to the biggest strides in renewable energy development.   Farrell also authored the landmark report Energy Self-Reliant States, which serves as the definitive energy atlas for the United States, detailing the state-by-state renewable electricity generation potential. Farrell regularly provides discussion and analysis of distributed renewable energy policy on his blog, Energy Self-Reliant States (, and articles are regularly syndicated on Grist and Renewable Energy World.   John Farrell can also be found on Twitter @johnffarrell, or at


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