Dams and the Power Grid: Building the Electric State

Up to now, we have followed the story from the discovery of electricity through the birth of the power stations and grids that generate it. Yet in the first half of the 20th century, the very mechanism of generation swelled to a scale beyond imagining. Humanity learned to dam entire rivers, to turn whole valleys into reservoirs, and to draw electricity from them. And it strung across the continent a network of transmission lines to carry that electricity to cities hundreds of kilometers away. In this chapter, we trace the era when electricity grew beyond the business of a single company and became the work of the state itself, told through both its dazzling achievements and the sacrifices paid in their shadow.

Taming the Rivers: The Rise of Giant Hydropower

Using the force of water to move things was old wisdom, dating back to the age of the waterwheel. But at the end of the 19th century, paired with the generator, the flow of water took on an entirely new value. Falling water strikes a turbine and spins it, and from that rotation electricity is drawn—this was the birth of hydroelectric power.

In Japan too, this journey began early. In Kyoto, amid a great engineering project to draw water from Lake Biwa, generation using that flow was planned. In 1891, the Keage Power Station began operating. Regarded as Japan’s first hydroelectric station built for commercial use, its electricity is said to have run Japan’s first streetcars, powered factories, and helped drive the modernization of Kyoto. The momentum of water falling from mountain heights to the lowlands was transformed, just as it was, into the lights of the city and the turning of wheels.

In the 20th century, this hydropower moved toward a scale of an entirely different order. Rather than merely using a small drop, engineers conceived of damming an entire river to create a vast reservoir, then letting the water fall all at once. The higher the dam, the greater the drop, and the more electricity that could be drawn. In time, taming a river swelled into a comprehensive enterprise of national land-building—not only generating power, but also preventing floods, drawing water to farmland, and clearing channels for ships, all achieved at once.

The State That Dammed the Valleys: Hoover Dam and the TVA

As the symbol of giant hydropower, the first name to come up is America’s Hoover Dam. Built in the steep canyon of the Colorado River, construction of this dam began in 1931, in the midst of the Great Depression. Crowds of people who had lost their jobs gathered at the site and took on grueling work in the scorching wilderness. Far ahead of the original schedule, it was completed in 1936. Among the largest in the world at the time of completion, it took on irrigation, flood control, and power generation all at once, sending its electricity across the broad expanse of Nevada, Arizona, and California. To tame a raging river by human hands and turn barren land into rich farmland and cities—the Hoover Dam was etched into people’s memory as proof that the modern state had gained the power to remake nature.

Around the same time, in the American South, another grand experiment was underway. The Tennessee Valley Authority, or TVA. Established in 1933 as part of a policy to rebuild a region groaning under the Depression, it was a state-funded enterprise. The TVA built dams one after another along the Tennessee River, advancing hydropower, flood control, and river navigation as a single effort. By the time the project took shape, more than a dozen dams had been built, and ships could pass along the river for hundreds of kilometers. The cheap electricity born there was delivered to rural homes that until then had not even had electric lamps, and is said to have changed daily life profoundly.

That said, such vast undertakings drew arguments on both sides from the very beginning. Objections to the state stepping directly into the business of electricity, and resistance to repainting a region’s nature and way of life by national plan, were voiced repeatedly even at the time. Voices praising the achievement of creating jobs and bringing electricity to poor regions, and voices turning their gaze to the people forced to relocate and the lands submerged underwater—both stood side by side from the start. That fact is worth writing down before, with hindsight, taking one side over the other.

The Veins That Bind a Continent: The Grid and the Electric State

No matter how vast a dam is built, it means nothing if the electricity born there cannot be carried to its users. What is so often overlooked in the history of power is precisely the mechanism of this ‘carrying’ side—the existence of the transmission grid.

While power stations stood in mountain valleys and on the outskirts along rivers, those who needed electricity most were the distant cities and factories. So engineers refined a method of raising the voltage to send the power, then lowering it again where it was used. The higher the voltage, the less is lost along the way, even over long distances. In this way, high-voltage transmission lines stretching from power stations to cities were strung across the continent like a mesh of netting.

In time, these grids grew into vast systems that linked not just a single power station but many stations and regions together. If electricity ran short in one place, it could be drawn from another. The peaks and valleys of demand could be smoothed out across a wide area. The grid became, as it were, the veins of the electric state, sending its force into every corner of society. Electricity was no longer a luxury of a few towns, but the very foundation that moved the entire nation.

Having tamed the rivers, dammed the valleys, and strung the grid across the continent, humanity acquired the art of binding the forces of nature on a national scale. It was, to be sure, a great feat that laid the foundation of modern society. Yet hydropower, coal, and oil each had their own limits. More force from fewer resources—that inexhaustible craving turned humanity’s gaze toward one extraordinary possibility. An energy of unimaginable density, locked within the atom. Next time, we move into the era when it was called the energy of dreams and welcomed with hope.