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U.S. power sector outlook 2021: Rapid transition continues to reshape country’s electricity generation

March 01, 2021
Dennis Wamsted and Seth Feaster and David Schlissel
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Key Findings

Solar and battery storage adoption is enjoying almost exponential growth, and wind and solar technology improvements have helped turn the two resources into the least-cost option across the United States.

The 2021 Power Outlook observed that changes in Texas may be most indicative of changes happening in the electric sector

Executive Summary

The scope and speed of the transition away from fossil fuels, particularly coal, has been building for the past decade. That transition, driven by the increasing adoption of renewable energy and battery storage, is now nearing exponential growth, particularly for solar. The impact in the next two to three years is going to be transformative.

In recognition of this growth, IEEFA’s 2021 outlook has been expanded to include separate sections covering wind and solar, battery storage, coal, and gas— interrelated segments of the power generation sector that are marked by vastly different trajectories:

  • Wind and solar technology improvements and the resulting price declines have made these two generation resources the least-cost option across much of the U.S. IEEFA expects wind and solar capacity installations to continue their rapid rise for the foreseeable future, driven not only by their cost advantage but also by their superior environmental characteristics.
  • Coal generation capacity has fallen 32% from its peak 10 years ago—and its share of the U.S. electricity market has fallen even faster, to less than 20% in 2020. IEEFA expects the coal industry’s decline to accelerate as the economic competition from renewables and storage intensifies; operational experience with higher levels of wind and solar grows; and public concern about climate change rises.
  • Gas benefitted in the 2010s from the fracking revolution and the assumption that it offered a bridge to cleaner generation. IEEFA believes that the “gas bridge” has now been closed. The rise of wind and solar, plus the linked development of battery storage, has given utilities an option to largely bypass gas. In addition, growing evidence about methane emissions—a powerful greenhouse gas—throughout the gas production, distribution and consumption chain has undercut its previous environmental claims. IEEFA concludes that the sharp rise in gas-fired capacity (specifically combined cycle units) in the 2010s has reached a plateau.

This year’s outlook also includes a section on the significant expansion in power sector applications of battery storage. Little more than a demonstration-scale technology four years ago, utility scale storage installations topped the 1 gigawatt mark this year and are pegged to jump to almost 6 GW annually by 2025. These developments, currently largely using four-hour duration lithium batteries, give utilities the ability to store wind and solar generation when it is not needed and use it during periods of peak demand. As one utility executive has described it, this enables “solar after sunset.” IEEFA expects the coming surge in battery storage deployment to further undercut the economics of both coal and gas-fired generation, speeding future fossil retirements.

On top of these market-driven changes, it is clear the new Biden administration is going to take a much more aggressive policy approach over the next four years to quickly push the U.S. electricity sector to be less carbon-intensive. In her first speech, Energy Secretary Jennifer Granholm said: “The Department of Energy is one of our government’s most fighting forces as we pursue the goal of a carbon-pollution free country. We have to add hundreds of gigawatts to the grid over the next four years. It’s a huge amount. And there’s so little time.” 

The Energy Information Administration expects a slight upward bounce in coal generation in 2021 due to higher gas prices, but even if that does happen, IEEFA’s analysis indicates that it will be a short-lived reprieve, with coal’s downward trajectory resuming toward the end of the year or early in 2022. We projected last year that coal’s share of the U.S. generation sector could drop to 10% by 2025; that scenario still appears realistic.

Longer term, coal will be pushed out of the electricity sector completely, with gas set to decline as well. Cleaner and lower-cost wind and solar, coupled with battery storage, will drive fossil fuels out of the market. Furthermore, the high levels of investment pouring into research and innovations in storage and hydrogen suggest that the competitive pressure on fossil fuels will only increase.

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Net electricity generation

Press release: IEEFA U.S.: Energy transition to renewables likely to accelerate over next two to three years

Please view full report PDF for references and sources.

Dennis Wamsted

At IEEFA, Dennis Wamsted focuses on the ongoing transition away from fossil fuels to green generation resources, focusing particularly on the electric power sector.

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Seth Feaster

Seth Feaster is an energy data analyst whose work focuses on the coal industry and the U.S. power sector.

Before joining IEEFA, he created visual presentations at the New York Times for 25 years with a focus on complex financial and energy data; he also worked at The Federal Reserve Bank of New York. 

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David Schlissel

David Schlissel is IEEFA’s Director of Resource Planning Analysis. His work focuses primarily on the technical and economic viability of resources being used or being proposed for use in the electric power sector.

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