Ages of infrastructure
May 31, 2026
The booms and busts of technologies on the grid tell stories about America’s industrial ambitions over more than a century. Coming out of the Great Depression, the New Deal created large hydroelectric projects like the Grand Coulee Dam, Hoover Dam, Bonneville Dam, and the Tennessee Valley Authority. The postwar era saw rapid growth in electricity demand needed to power factories and suburban appliances, leading to the first wave of coal and natural gas plants. Nuclear energy emerged during the Cold War amid the wave of technological optimism that comes with trans-Atlantic flights and space programs. Ultimately, rising construction costs, environmental regulations, and inflation made the decade-long construction timeline of a new nuclear plant infeasible, challenges that still exist today. In the 1990s and 2000s, cheap domestic natural gas and more efficient combined-cycle plants reshaped the grid as many regions transitioned to deregulated electricity markets that rewarded their operational flexibility. Today, wind, solar, and batteries are the fastest-growing technologies on the grid. Originally catalyzed by federal and state policy, renewables and storage have advanced to become the cheapest source of new capacity on the grid. Source: EIA.