Dig Energy Completes First Commercial Geothermal Installation Using High-Pressure Water-Jet Drilling

Real estate developers and urban planners frequently argue that geothermal heating and cooling is simply too expensive and physically disruptive to install in densely built cities. The conventional wisdom holds that boring hundreds of feet into the earth requires massive, noisy rigs that disrupt neighborhoods and blow up construction budgets.

But a project completed in August 2026 directly contradicts that assumption. Dig Energy, a New Hampshire-based startup, successfully drilled seven geothermal boreholes at a commercial site in the middle of Boston, using a compact water-jet rig that occupied the space of a few parking spots and operated quietly enough for workers to hold normal conversations nearby.[1][2][3]

The installation took place at 100MAG, the artificial intelligence and innovation hub adjacent to the headquarters of Suffolk Construction. Announced on September 10, 2026, the project marks the first commercial deployment of Dig Energy's proprietary drilling platform. Suffolk Technologies, the venture capital arm of the national general contractor, had previously backed the startup through its BOOST accelerator program. “This project is exactly the type of environment where the Dig technology excels: a tight lot, operating under a quick, live schedule,” said Dulcie Madden, co-founder and chief executive of Dig Energy.[1][2][3]

By deploying the system on an active urban lot, Suffolk aimed to evaluate whether the technology could genuinely scale across its portfolio of education facilities and data centers. The general contractor typically evaluates new construction methods through controlled pilot projects before broader adoption. Using Dig Energy's hardware gave Suffolk a live deployment of geothermal infrastructure, enabling the firm to assess the actual installation process, the timeline, and the final cost metrics against traditional heating, ventilation, and air conditioning systems.[2][3][4]

To understand why this deployment matters, one must look at the mechanical bottleneck that has kept geothermal adoption at roughly 1 percent of United States buildings. Geothermal systems rely on ground-source heat pumps, which circulate fluid through underground pipes to exchange thermal energy with the earth. Because the ground maintains a constant temperature year-round—acting as a massive thermal battery—these systems are highly efficient, requiring no on-site combustion and drawing significantly less electricity than air-source heat pumps during extreme weather.[1][4][5]

While the operational physics are proven, the upfront installation is notoriously difficult. Traditional drilling relies on heavy carbide bits or compressors to grind through rock. That conventional process is loud, slow, and messy. As a traditional bit grinds downward, crews must continuously shore up the borehole with steel casing to prevent the walls from collapsing before the permanent heat-exchange pipe can be inserted.[1][3][6]

The operation requires massive volumes of water to cool the drill bit and flush displaced earth to the surface as mud. For a retrofit in a dense urban environment, the footprint of the rig, the noise complaints, and the logistics of hauling away tons of slurry often make the project economically unviable. The expense of installing a geothermal system can be up to five times that of an equivalent air-source heat pump, restricting adoption to regions with heavy subsidies or massive heating loads.[1][4][6]

Dig Energy approaches the physics of drilling entirely differently. Instead of grinding rock with metal, the company's rig uses a high-pressure nozzle that fires water at 10,000 pounds per square inch to cut through soil and bedrock. While the oil and gas industry experimented with fluid drilling decades ago, it never gained traction for deep fossil-fuel extraction because it did not increase productivity at those extreme depths. Madden and co-founder Thomas Lipoma spent five years adapting the concept specifically for the shallower depths required by building-scale geothermal systems.[1][3][7]

The most significant mechanical shift in Dig Energy's approach is what happens after the hole is bored. The team engineered a specialized drill string—the vertical piping connecting the surface equipment to the drill tip—that simply stays in the ground once the target depth is reached. Because the nozzle is manufactured cheaply enough to be left behind, the drill string itself becomes the permanent heat exchanger.[1]

This eliminates the need to insert a separate pipe, allowing the initial borehole to be drilled at a much smaller diameter. The cascading effects of that smaller diameter fundamentally alter the economics of the installation. According to Madden, the Boston project used just one-tenth of the water required by a conventional rig and generated 75 percent less waste material to be carted off the site.[1]

By eliminating the need for temporary casing and reducing the sheer volume of displaced earth, the company estimates its technology can cut total drilling costs by up to 80 percent. The rig itself is highly modular, allowing it to be transported and assembled in tight spaces where a traditional rig could never fit. During the two-week drilling phase at 100MAG, the active work area occupied only a fraction of the space normally required, minimizing disruption to the active jobsite.[1][2][3]

The stakes for commercializing this kind of thermal infrastructure are massive. Heating and cooling account for approximately 35 percent of global energy consumption, the vast majority of which is currently powered by fossil fuels. As the electrical grid faces unprecedented strain from data centers and the broader electrification of the economy, shifting building loads to highly efficient ground-source heat pumps could save grid operators billions of dollars annually in avoided capacity upgrades.[4][7]

Despite the successful Boston deployment, the technology still faces a scaling challenge. The water-jet system must prove it can maintain its speed and cost advantages across a wide variety of geological conditions, from soft clay to dense granite, without unexpected failures. Dig Energy is currently booked through mid-2027 with upcoming projects in New England, including a grocery store and a utility headquarters, which will serve as the next proving grounds for the hardware.[1][2]