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Petra

Robotic systems for underground utility installation

Overview

Petra develops robotic systems that bury and service underground utilities in difficult and disaster-prone geologies to protect critical infrastructure. Its robots install and maintain utilities in places traditional methods can’t reach and can be sold or leased with ongoing service contracts to utilities, government agencies, and private firms. Petra differentiates itself with a focus on resilient underground installation, end-to-end deployment and maintenance, and active partnerships, backed by leadership with NASA, Tesla, and other tech backgrounds. The goal is to improve the resilience and reliability of critical infrastructure by securely placing and maintaining underground utilities in areas previously considered impractical.

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About Petra

Simplify's Rating
Why Petra is rated
D+
Rated C on Competitive Edge
Rated D+ on Growth Potential
Rated D+ on Differentiation

Industries

Robotics & AutomationIndustrial & ManufacturingGovernment & Public SectorEnergy

Company Size

51-200

Company Stage

Series A

Total Funding

$33M

Headquarters

San Francisco, CA

Founded

2013

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Simplify's take

What believers are saying

  • Phoenix Boring raised just over $5.2 million in March 2026.
  • Built hardware still exists, and PG&E paid for a 500-foot gas-main bore.
  • RevenueBase listed Petra active on September 21, 2026, with 51-200 employees.

What critics are saying

  • Petra wound down in 2024, and Phoenix Boring now controls most assets.
  • PG&E work validated the tech, but utilities demand lower per-mile costs immediately.
  • A single engineer bought the last two machines personally, signaling existential financing failure.

What makes Petra unique

  • Petra’s Swifty bored Sioux quartzite with thermal spallation, avoiding mechanical cutters.
  • Zilper merger expanded Petra’s geologies from hard rock to flowing sand and cobbles.
  • Petra targeted utility undergrounding, not tunnels, for 24-to-60-inch critical infrastructure bores.

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Funding

Total Funding

$33M

Above

Industry Average

Funded Over

2 Rounds

Series A funding typically happens when a startup has a product and some customers, and now needs funding to scale. This money is usually used to grow the team, expand marketing, and improve the product. Venture capital firms are frequently the main investors here.
Series A Funding Comparison
Above Average

Industry standards

$15M
$8.2M
$15M
$30M
$30M

Growth & Insights and Company News

6 month growth

-1%

1 year growth

-1%

2 year growth

-1%
Business Wire
Sep 15th, 2022
Petra Acquires Trenchless Tunneling Company Zilper To Enable Utility Undergrounding Through Any Nightmare Geology

SAN FRANCISCO--(BUSINESS WIRE)--Petra, the first company capable of undergrounding critical utility infrastructure from difficult hard rock to soft ground geologies, announced the acquisition of Zilper Trenchless, a pioneer in the trenchless technology space. Zilper Trenchless machines uniquely install critical utility infrastructure through nightmare geologies such as flowing sands, cobbles, and high water table environments. The vast majority of the world’s electric, water, and sewer utilities were not designed to withstand the storms, extreme heat, and drought brought on by climate change and rapid population growth. Above-ground power lines have caused thousands of wildfires in drought prone areas and blackouts during hurricanes. In coastal areas, increased flooding and sea level rise cause sewage to leach into waterways. There is a growing demand by municipalities to expand underground utilities, but in many populated areas with hard and soft ground nightmare geologies, conventional technology has difficulty boring through flowing sand, high water table content, and cobbles. According to the Black & Veatch 2022 Water Report, the United States would need to increase its investment in water infrastructure by $2.2 trillion over the next 20 years, or roughly $109 billion per year to close the water industry’s current investment gap

Informed Infrastructure
Sep 15th, 2022
Petra Acquires Trenchless Tunneling Company Zilper to Enable Utility Undergrounding Through any Nightmare Geology | Informed Infrastructure

Petra, the first company capable of undergrounding critical utility infrastructure from difficult hard rock to soft ground geologies, announced the acquisition of Zilper Trenchless, a pioneer in the trenchless technology space.

Petra
Sep 15th, 2022
Zilper Trenchless merges with Petra

Zilper, a pioneer in the trenchless technology space, will merge with Petra, the first company capable of undergrounding critical utility infrastructure through nightmare hard rock geologies.

E-Girişim
Jun 16th, 2022
Tekfen Ventures, Yeni Nesil Tünel Açma Teknolojileri Üreten Abd Merkezli Petra’Ya Yatırım Yaptı

egirişim - Girişimcilik ve Teknoloji Tekfen Yatırım Grubu’nun ana şirketi olan Tekfen Ventures, ağırlıklı olarak Tekfen’in faaliyet gösterdiği alanlarda, girişim dünyasındaki fırsatları değerlendirmek amacıyla erken aşama teknoloji şirketlerine yatırım yapmak üzere 2016 yılında kuruldu. Odaklandığı sektörlerdeki girişim sayısını 13’e çıkaran Tekfen Ventures’ın portföyündeki şirketlerinden biri de, dünyada bir ilk olan; temassız, yeni nesil tünel açma teknolojileri üreticisi olan Petra. Daha []

Webrazzi
Jun 16th, 2022
Tekfen Ventures, Temassız Tünel Açma Teknolojileri Üreticisi Petra'Ya Yatırım Yaptı

Tekfen Ventures, ağırlıklı olarak Tekfen’in faaliyet gösterdiği alanlarda, girişim dünyasındaki fırsatları değerlendirmek amacıyla erken aşama teknoloji şirketlerine yatırım yapmak üzere 2016 yılında ...

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