In 2018, the U.S. Air Force signed a 35-year lease for underused Mojave desert land. 8 years later, the site hosts 1.9 million solar panels, turning a historic aircraft testing ground into a massive renewable-energy hub

There is an unusual piece of California desert where two very different chapters of American technology meet. In 2018, the U.S. Air Force signed a 35-year lease for underused Mojave desert land. Eight years later, the site hosts 1.9 million solar panels, turning a historic aircraft testing ground into a massive renewable-energy hub. The Edwards Sanborn solar and battery plant now powers over 238,000 homes.

The land around Edwards Air Force Base was once valued because its enormous dry lakebeds gave experimental aircraft something rare: a vast, naturally flat surface with no conventional runway required. Today, nearby and partly on the same military landscape, engineers have built one of the largest solar and battery projects in the United States.

The connection is not simply that both projects needed empty land. It is the physical character of the Mojave that made the area useful in both cases. The desert floor is broad, dry and remarkably open, while the region receives intense sunlight for much of the year. What once gave aircraft engineers room to experiment now gives energy engineers room to spread nearly two million photovoltaic modules across thousands of acres.

Why the Mojave has such an unusual surface

A dry lakebed is not just a lake that happens to have disappeared. It is the remains of a landscape repeatedly shaped by water, evaporation and sediment. During wetter periods, water can collect in low basins where fine particles settle across the bottom. When the water disappears under the desert sun, those sediments remain behind, producing a broad surface that can become extremely hard and smooth.

That matters enormously to aircraft testing. A conventional runway has to be engineered, paved and maintained, but the dry lake at what was once Muroc Army Air Field provided a gigantic natural alternative. Edwards Air Force Base records that early jet aircraft used the lakebed because it offered exceptionally long, unobstructed surfaces, an important advantage when experimental engines could fail or aircraft needed unusual amounts of room to accelerate and stop.

The landscape became central to some of the most important experiments in aviation history. On October 14, 1947, U.S. Air Force Capt. Charles E. “Chuck” Yeager piloted the rocket-powered Bell X-1 during the flight that made him the first person to exceed the speed of sound in level flight. The aircraft reached about 700 miles per hour, or Mach 1.06, at roughly 43,000 feet.

That historic flight did not mean the X-1 simply raced along the lakebed at Mach 1. The aircraft was carried aloft and released from a B-29 before using its rocket engine to accelerate through the sound barrier. The lakebed was part of the wider flight-test environment that made Edwards so valuable, providing an enormous safety area below experimental aircraft and a place where engineers could work with machines operating at the edge of known performance.

The desert now has a very different machine

Nearly eight decades later, the same broad desert region has become a laboratory for another engineering problem: how to turn intermittent sunlight into dependable electricity. The Edwards Sanborn Solar and Energy Storage Project occupies roughly 4,600 acres in Kern County, with part of the development on land associated with Edwards Air Force Base and the remainder on private property. The project combines about 1.9 million photovoltaic panels with a massive battery system.

The solar installation is rated at about 864 megawatts of DC capacity according to the project's engineering contractor, while other project descriptions commonly round the figure to 875 megawatts. That distinction comes from how solar capacity is reported, particularly the difference between the panels' DC rating and the amount of electricity ultimately delivered through the grid connection. The important point is the scale: this is not a field of rooftop-style panels, but an industrial power plant spread across miles of desert.

The numbers become even more striking when the batteries are included. The facility contains 3,287 megawatt-hours of energy storage and 120,720 individual batteries, according to Mortenson, the project's engineering, procurement and construction contractor. The installation was completed in the early 2020s and became one of the largest integrated solar-plus-storage projects of its kind.

Why solar panels belong in a place this dry

Solar panels do not need desert heat. In fact, excessive heat can reduce photovoltaic efficiency because semiconductor materials generally produce less voltage as their temperature rises. What the Mojave offers is something more valuable: abundant sunlight, relatively little cloud cover and enormous areas where large arrays can be constructed without competing with dense urban development.

A photovoltaic panel converts sunlight into electricity through semiconductor materials that respond when photons transfer energy to electrons. The resulting electricity is direct current, which then has to be collected, converted and sent through electrical equipment before reaching the wider grid. At a project containing nearly two million modules, the engineering challenge is therefore not simply collecting sunlight. It is managing an enormous electrical system spread across thousands of acres.

The desert's openness helps with that problem. Roads, electrical collection systems, substations and maintenance corridors can be laid out across a large footprint, while the panels can be arranged in long, repeating rows. The Edwards Sanborn project includes more than 98 miles of medium-voltage wire and more than 361 miles of DC wiring, illustrating how much infrastructure exists beneath the headline number of solar panels.

The batteries solve the problem sunlight creates

Solar power has an obvious weakness. The sun does not produce electricity on demand. Output rises during the day, reaches its strongest levels around the middle of the day, and then falls as evening approaches. Electricity demand, however, does not necessarily follow the same curve. In California, evening demand can remain high precisely when solar generation is declining.

That is where the 3,287 megawatt-hours of storage changes the character of the project. Instead of treating excess daytime solar electricity as something that must immediately be consumed, the battery system can absorb electricity and release it later. Storage therefore acts as a bridge between the timing of generation and the timing of demand.

This is one reason the project is more interesting than its enormous panel count suggests. A solar farm alone produces electricity when conditions allow. A solar-and-storage facility can shift some of that production through time. The batteries do not create new energy, and they cannot make solar power continuous under every circumstance, but they give grid operators another tool for managing when electricity reaches the system.

The scale of the battery installation also reveals the physical reality behind modern energy storage. More than 120,000 battery units are not one giant battery sitting in the desert. They form a coordinated network of electrochemical storage devices, power electronics, cooling systems, transformers and control equipment. The system has to monitor voltage, temperature, state of charge and power flow while responding to commands from the grid.

A landscape shaped by extremes

There is a deeper reason the story of Edwards feels so unusual. The Mojave has repeatedly been used because it removes ordinary constraints. For aviation, the constraint was space. Experimental aircraft needed somewhere they could accelerate, climb, maneuver and potentially fail without immediately encountering cities, mountains or buildings. For solar development, the constraint is different but equally physical: large amounts of land are needed to collect energy from a diffuse source.

The projects are not literally the same piece of ground. The historic X-1 flight took place in the Edwards flight-test environment centered on the region's dry lakebeds, while the Edwards Sanborn solar project occupies a combination of Air Force-leased and private land in the surrounding area. That distinction matters because the popular image of solar panels sitting directly on the exact strip of lakebed where Yeager broke the sound barrier is misleading.

Yet the geographical relationship is still remarkable. The same desert environment that became synonymous with experimental flight is now helping California experiment with a different kind of high-energy technology. The landscape has gone from supporting rocket planes and prototype aircraft to supporting photovoltaic semiconductors, power converters and tens of thousands of batteries.

There is something almost poetic about that transition, but the science is practical. The Mojave's broad spaces, strong sunlight and existing energy infrastructure make it useful for electricity production just as its flat terrain and isolation once made it useful for aviation research. One generation used the desert to discover how fast an aircraft could travel. Another is using it to explore how much electricity the sun can provide when paired with storage.

The striking part is not that the desert has changed completely. It is that the underlying physical advantages remain. A landscape that once offered engineers room to push an aircraft beyond the known limits of flight now offers them room to push the electrical grid toward a different limit: producing, storing and delivering enormous amounts of power from sunlight.