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Sperra

3D-printed concrete offshore energy foundations

Overview

Sperra designs and manufactures concrete infrastructure for renewable energy projects at sea and in other aquatic environments. It uses automated design and large-format 3D concrete printing to fabricate parts near project sites from local materials, lowering cost, material waste and carbon compared with conventional concrete and steel. Its products include gravity anchors for floating solar, floating offshore wind and wave energy; fixed-bottom foundations; canal solar systems; and subsea pumped storage hydropower for long-duration energy storage. Through its UK arm, Sperra Seaworks, it is developing the Floating Construction Station, a floating platform for building and launching offshore wind foundations and anchors from ports. Customers are offshore wind, floating solar and marine energy developers, utilities and ports. Sperra earns revenue from supplying structures and from engineering, design and fabrication planning services.

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About Sperra

Simplify's Rating
Why Sperra is rated
C
Rated C on Competitive Edge
Rated C on Growth Potential
Rated C on Differentiation

Industries

Robotics & AutomationConsultingIndustrial & ManufacturingEnergy

Company Size

11-50

Company Stage

Seed

Total Funding

$6.3M

Headquarters

Boulder, CO

Founded

2017

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Simplify's take

What believers are saying

  • NYSERDA funding reached about $5 million by July 24, 2026, supporting Bergen expansion.
  • Germany Trade and Invest spotlighted StEnSea in August 2026, strengthening international validation.
  • Sperra raised $2 million in May 2025 and reported $6.3 million total funding by November 2026.

What critics are saying

  • Commercial revenue still depends on pilot conversions after the March 2026 Portugal deployment.
  • StEnSea and other government-funded programs end by late 2026, exposing Sperra to grant exhaustion.
  • If floating-construction and subsea-storage projects stall, Sperra loses its entire category-defining thesis.

What makes Sperra unique

  • Sperra deployed its first full-scale 3D-printed gravity anchor at EDP Portugal on March 19, 2026.
  • Sperra Seaworks won £1 million from The Crown Estate on December 11, 2025 for FCS development.
  • Sperra combines local-material concrete printing with marine foundations, anchors, and subsea storage.

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Funding

Total Funding

$6.3M

Above

Industry Average

Funded Over

3 Rounds

Seed funding is usually the first official round after pre-seed, when a startup has a prototype or concept. It’s typically used to develop the product, test the market, and start building the team. Investors here are often angel investors or early-stage venture capitalists.
Seed Funding Comparison
Below Average

Industry standards

$3.3M
$2M
$2M
$2.3M
$3M

Benefits

  • Paid Vacation
  • Flexible Work Hours
  • Remote Work Options

Growth & Insights and Company News

6 month growth

4%

1 year growth

4%

2 year growth

4%
Offshore Source
Oct 5th, 2026
DOE awards HyTN vouchers to 14 hydropower technology projects.

DOE awards HyTN vouchers to 14 hydropower technology projects. The US Department of Energy's (DOE's) Hydropower and Hydrokinetic Office (H2O) selected 14 hydropower projects to begin negotiations on vouchers for in-kind support through the Hydropower Testing Network (HyTN). Working with one of HyTN's 21 testing facilities, voucher recipients will improve the readiness of their hydropower technologies. "By pairing industry innovators with leading US test facilities and technical expertise, HyTN accelerates the development of next-generation technologies that keep hydropower reliable and abundant," said H2O Director Nichole Fitzgerald. Hydropower remains an important pillar of America's energy mix, accounting for nearly 6% of the country's total utility-scale electricity generation. Modernizing existing hydropower plants and implementing new technologies will help the United States meet its growing energy demand and drive down energy prices. By providing access to a wide range of testing capabilities, HyTN accelerates the development of hydropower innovations and helps ensure the United States can maintain and grow its hydropower systems in accordance with President Trump's Executive Order 14154, Unleashing American Energy. This is the second round of selections from HyTN, which offers access to more than 65 specialized physical testing and modeling capabilities ranging from hydraulic and biological testing to techno-economic analysis. The technology developers selected for this cohort have been matched with these capabilities, pending negotiations, based on their testing needs. The 14 selected projects are: * Dry Surface Technologies, LLC, based in Guthrie, Oklahoma, will work alongside Pacific Northwest National Laboratory (PNNL) to scale up the production of a non-toxic antifouling coating to a pilot-scale manufacturing process, providing a less expensive, non-toxic alternative for preventing clogged components, and reducing facility repairs. * Emrgy, Inc., based in Atlanta, Georgia, will demonstrate the prototype of a low-head turbine technology platform designed to generate energy from man-made water infrastructure like irrigation canals. * GenH, Inc., based in Somerville, Massachusetts, will test a rapidly deployable, low-impact technology to generate electricity from existing non-powered dams at the University of Minnesota. Results will inform a predictive framework that will help quickly design custom systems for different dams. * Hydro Green Energy, LLC, based in Birmingham, Alabama, will work with the National Laboratory of the Rockies to develop a grid-focused economic analysis for a pumped storage hydropower project at an existing dam and reservoir, facilitating advancement towards licensing and construction. * Kingsbury, Inc., based in Philadelphia, Pennsylvania, is investigating an advanced thermoplastic polymer as a possible bearing material for use in hydropower generators, continuing its work with Oak Ridge National Laboratory (ORNL) from the first round of HyTN. * Nucleic Sensing Systems, based in Saint Paul, Minnesota, will validate its real-time environmental DNA (eDNA) sensor, which monitors water for the presence of fresh, dissolved eDNA and distinguishes it from stale or transported eDNA. * Prometheus Innovations, LLC, based in Lafayette, Louisiana, will continue their work from the first round of HyTN, collaborating with PNNL to assess a coating that prevents harmful aquatic growth like invasive mussels and brown algae. * Prometheus Innovations, LLC will also work with PNNL to test an underwater net coating that can attract or repel fish to prevent them from swimming into water intake structures. * Public Utility District No. 1 of Chelan County, based in Wenatchee, Washington, will evaluate self-lubricating, grease-free wicket gate stem bushings at PNNL's tribological test facility, determining its effectiveness for upgrading hydropower infrastructure. * Public Utility District No. 1 of Chelan County will also work with PNNL to validate a low-temperature "cold spray" technique to repair worn hydropower turbine components on-site without using heat. * Radmantis, based in Toledo, Ohio, will use Verdantas' Fish Passage Survival and Behavior Steel Testing Flume Facility to continue their work from the first round of HyTN, evaluating whether mechanically guided fish entrainment improves AI-based selective fish passage at hydropower facilities. * RCAM Technologies, Inc. DBA Sperra, based in Boulder, Colorado, will work with Polaris EcoSystems to advance a 3D-printed subsea pumped storage hydropower system that stores electricity in hollow concrete spheres on the seafloor. * University of Washington's Applied Physics Laboratory, based in Seattle, Washington, will collaborate with PNNL to assess the reliability and durability of a small, low-cost sensor designed to monitor water quality for hydropower and pumped storage facilities in a more economically feasible way. * VBASE Oil Company, based in Pendleton, South Carolina, will continue their work from the first round of HyTN, collaborating with ORNL to test a lubricant for use in hydropower facilities. The HyTN voucher opportunity is funded by H2O and managed by ENERGYWERX in partnership with DOE, a collaboration made possible through a partnership intermediary agreement set up by DOE's Office of Technology Commercialization.

Energy Global
Sep 8th, 2026
£1 million boost for UK offshore wind supply chain innovators

Seven UK companies have secured a share of £1 million through the Offshore Wind Growth Partnership’s Innovation Funding programme to accelerate offshore wind technologies including foundations, substructures, substations, and electrical systems.

Pleuger Industries
Aug 11th, 2026
Germany Trade & Invest highlights PLEUGER's role in pioneering underwater energy storage.

Germany Trade & Invest highlights PLEUGER's role in pioneering underwater energy storage. Engineering Expertise Behind the StEnSea Energy Storage Project PLEUGER's contribution to the innovative StEnSea (Stored Energy in the Sea) project has been highlighted by Germany Trade & Invest (GTAI), recognizing the collaboration between research and industry that is driving new approaches to renewable energy storage. Led by Fraunhofer IEE and supported by the project partners Sperra and PLEUGER, the StEnSea project explores an innovative approach to storing renewable energy using large concrete spheres installed on the seabed. During periods of excess renewable electricity, seawater is pumped out of the sphere and stored as potential energy. When electricity is needed, seawater flows back into the sphere through a pump-turbine system, generating power. The heart of the system At the core of the StEnSea concept is PLEUGER's expertise in submersible pump technology. "The pump is the heart of the StEnSea project," says Edris Faez, Head of Sales at PLEUGER. Operating reliably in seawater at depths of around 600 metres presents unique engineering challenges. Drawing on decades of experience in designing and manufacturing submersible pump systems for demanding applications, PLEUGER was selected as the project's pump partner to help develop a solution capable of performing in these extreme conditions. Innovation through collaboration StEnSea demonstrates what can be achieved when research institutions and industry combine their expertise. Together with Fraunhofer IEE and Sperra, PLEUGER is helping advance an innovative energy storage concept that could support the integration of renewable energy and contribute to a more sustainable energy future. Pleuger Industries GmbH is proud to be part of this pioneering project and thank its partners for their continued collaboration. August 11, 2026

Leads on Trees
May 15th, 2025
Sperra Raises $2M for Renewable Energy

Sperra has raised a $2M seed round to innovate in renewable energy infrastructure. Their interests may include custom 3D printing, offshore energy solutions, energy storage technologies, marine infrastructure development, and sustainable manufacturing solutions.

Power Engineering International
Nov 4th, 2024
Pilot to test spherical pumped storage on the US seabed

Fraunhofer IEE will be working with partners including US start-up Sperra, which specialises in 3D concrete printing for applications in the field of renewable energies, and Pleuger Industries, a Miami-based manufacturer of underwater motor pumps.

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