The Western grid is becoming cleaner, more solar-heavy, and more diverse.
Coal decline is still one of the clearest structural shifts in the region, but the Western story is larger than one fuel. Hydro remains foundational, solar is rising quickly, wind is widespread, nuclear still matters in a few states, and geothermal gives the region a rare source of firm clean power.
Clean portfolio
What makes the Western grid different
The West does not rely on one clean resource. Hydro still carries the largest share of the region's clean generation, solar and wind now add a large second layer, nuclear continues to matter in a few states, and geothermal remains a small but strategically important source of firm clean power.
2025 clean-generation mix
Among the region's major clean resources in 2025, hydro remains the largest block, while solar and wind have become large enough to reshape the balance of the portfolio.
Hydro35.9% · 152,009 GWh
Solar25.5% · 107,857 GWh
Wind21.7% · 91,800 GWh
Nuclear13.4% · 56,629 GWh
Geothermal3.6% · 15,383 GWh
Lead chart
How the Western fuel mix is changing
The West is not converging on one clean-energy model. It is assembling a varied portfolio shaped by geography, legacy infrastructure, and new buildouts. Solar is now larger than coal in the regional annual totals, but gas still anchors a large part of the system and coal's decline remains the clearest structural shift.
Western annual generation by fuel
2015 to 2025
Gas
Coal
Solar
Wind
Hydro
Nuclear
Geothermal
Gas remains the largest single line, coal has been cut roughly in half since 2015, and solar now sits above coal in the annual regional totals. The Western transition is still messy, but the long-run direction is unmistakable.Source: EIA Electricity Data Browser
Coal section
Coal's long retreat is still the clearest structural change
Western coal generation falls from 189,377 GWh in 2015 to 92,458 GWh in 2025. Solar is now larger than coal in the annual totals, while gas still holds a large share and hydro remains a major clean backbone.
Western coal generation
Long-run view
Coal
Coal is no longer the central Western growth story. The important question now is which states and technologies shape the region's next replacement phase.Source: EIA Electricity Data Browser
Coal generation, 2015
189,377 GWh
Coal generation, 2025
92,458 GWh
Change since 2015
-51.2%
Battery storage
Battery storage is spreading beyond California
California built the first large Western battery center, but the storage story is no longer confined there. Arizona in particular has become a second major storage state, while Nevada and New Mexico are also building meaningful capacity.
Operating battery storage by state
Cumulative MW, 2022 to May 2026
California
Arizona
Nevada
New Mexico
Colorado
California remains far ahead, but Arizona has become the clearest second center of Western battery growth. Nevada and New Mexico are also building meaningful capacity, which shows the storage story is no longer confined to one state.Source: EIA 860M May 2026 workbook