Brief
A tunneling robot developed by San Francisco-based startup Petra bombards tough terrain with high-energy particles to create tunnels ranging from 20 to 60 inches in diameter. The robot specializes in utility work at great depths where bedrock is often present.
Insight
The Energy Information Association estimates that the global demand for energy infrastructure will increase by 50% over the next 30 years. At the same time, the global effects of climate change highlight the vulnerabilities present in current utility installations, including above-ground power lines and underground utilities in soft soil layers.
Petra anticipates that installing utilities further underground will create a more resilient grid and reduce the risk of man-made disasters, such as wildfires or explosions.
“As the former President of SoCal Edison, I oversaw capital projects in urban, suburban and rural mountainous areas. A robot that can bury utility facilities in bedrock would have been a game-changer for us,” said Petra advisor Bob Foster. “In cities, it would allow us to bury utilities in bedrock, below the existing infrastructure. In mountainous areas, like the Sierra foothills, it would allow us to bury utilities in the most fire-prone regions of our state.”
Modern “trenchless” tunnel-boring machines — including micro tunnel boring machines and horizontal directional drilling — incorporate cutter heads that break easily when tunneling through hard rock, according to Petra’s press release. Petra’s thermal spallation drilling method aims to remove this obstacle and reduce the costs and complexity associated with utility boring projects.
In addition to its standard bore, Petra’s boring robot is also capable of reverse-tunneling, enabling both machine maintenance and cutter head rescue.Petra raised $33 million in its Series A funding round last month, led by venture capital firm DCVC with ACME Capital, Congruent Ventures, 8VC, Real Ventures, Elementum Ventures and Mac Venture Capital.
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