Rondo Energy, Inc.
Iron-based thermal energy storage system that converts renewable electricity into continuous industrial heat
New patent ·
- Sector
- Energy
- Headquarters
- OAKLAND, CA
- Founded
- 2020
- Latest Form D
- $25.1M, Jun 2022
- Total capital
- $25.1M
- Federal grants
- None on recordNo awards found in SBIR/STTR, NIH, NSF or DoD records.
- Private capital raised
- $25.1M
- 1 Form D · last Jun 2022
- 52 months since last filing
- Federal contracts
- None on recordNo federal contract awards found.
- Granted patents
- 30
- 10 pending · first 2025
- Rank in peer group#7 of 151
Capital timeline
Latest events
- Private capital raisedForm D · SEC · 1st filing$25.1M
Node area is scaled to amount. Form D reports securities sold, which can differ from an announced round; filings are numbered in the order they were made.
Standing among 151 peers
Line = medianEnergy · Device
- Granted patents#7 · top 5%
Cumulative measures favor older companies. Rankings describe position today, not outcome. Below the median, ranks show as a band rather than a number.
Founders and team
From SEC Form D filings- Samuel BurstenDirectorNamed in SEC Form D filings
- Lily GuseExecutive OfficerNamed in SEC Form D filings
- Mark HartneyDirectorNamed in SEC Form D filings
- John ODonnellDirector, Executive OfficerNamed in SEC Form D filings
- David RogersDirectorNamed in SEC Form D filings
- Peter von BehrensDirector, Executive OfficerNamed in SEC Form D filings
What it has protected
USPTO · 30 granted of 40- New patentThermal Energy Storage Systems For Use In Material ProcessingUSPTOUS 12,760,665
- New patentThermal Energy Storage System Coupled With A Solid Oxide Electrolysis SystemUSPTOUS 12,753,710
- GrantedThermal Energy Storage System Coupled With Thermal Power Cycle SystemsUSPTOUS 12,729,632
Show all 40 patent records
- Thermal Energy Storage Systems For Use In Material ProcessingOct 13, 2026 · US 12,760,665Granted
- Thermal Energy Storage System Coupled With A Solid Oxide Electrolysis SystemOct 6, 2026 · US 12,753,710Granted
- Thermal Energy Storage System Coupled With Thermal Power Cycle SystemsSep 8, 2026 · US 12,729,632Granted
- Thermal Energy Storage Systems For Use In Material ProcessingSep 1, 2026 · US 12,723,524Granted
- Methods For Material Activation With Thermal Energy Storage SystemAug 18, 2026 · US 12,709,998Granted
- Thermal Energy Storage Systems With An Energy Emitting SurfaceJul 21, 2026 · US 12,687,120Granted
- Thermal Energy Storage with Fluid Flow InsulationJul 16, 2026 · Application 19423094Pending
- Thermal Energy Storage System Coupled With Steam Cracking SystemJun 25, 2026 · Application 19394602Pending
- Energy Storage System And Alumina Calcination ApplicationsJun 18, 2026 · Application 19410883Pending
- Thermal Energy Storage System For Simple And Combined Cycle Power GenerationJun 11, 2026 · Application 19387364Pending
- Thermal Energy Storage System Coupled With Thermal Power Cycle SystemsJun 2, 2026 · US 12,644,396Granted
- Thermal Energy Storage System With A Heat Pump For Improved EfficiencyMay 5, 2026 · US 12,618,343Granted
- Thermal Energy Storage System for Use with a Low Temperature Heat Source and a Thermal Power Cycle SystemApr 21, 2026 · US 12,607,170Granted
- Energy Storage System And Alumina Calcination ApplicationsApr 21, 2026 · US 12,607,136Granted
- Thermal Energy Storage System With High Efficiency Heater ControlApr 7, 2026 · US 12,595,973Granted
- Thermal Energy Storage Systems For Use In Material ProcessingApr 2, 2026 · Application 19410588Pending
- Thermal Energy Storage System Coupled With Thermal Power Cycle SystemsMar 31, 2026 · US 12,590,549Granted
- Thermal Energy Storage Systems With Improved Seismic StabilityMar 12, 2026 · Application 19257268Pending
- Thermal Energy Storage System with Deep DischargeMar 10, 2026 · US 12,571,331Granted
- Thermal Energy Storage System Coupled To A Heat Exchanger With Thermal ProtectionMar 3, 2026 · US 12,566,034Granted
- Thermal Energy Storage System with Deep DischargeFeb 24, 2026 · US 12,560,105Granted
- Energy Storage System And Alumina Calcination ApplicationsFeb 17, 2026 · US 12,553,366Granted
- Thermal Energy Storage with Fluid Flow InsulationJan 20, 2026 · US 12,529,326Granted
- Thermal Energy Storage Systems For Use In Material ProcessingJan 20, 2026 · US 12,529,327Granted
- Thermal Energy Storage System Coupled With Steam Cracking SystemJan 13, 2026 · US 12,523,165Granted
- Thermal Energy Storage System Using A Mechanical Apparatus For Electric Power ModulationJan 8, 2026 · Application 19260019Pending
- Thermal Energy Storage System Coupled With Thermal Power Cycle SystemsJan 6, 2026 · US 12,516,613Granted
- Thermal Energy Storage Systems For Use In Material ProcessingDec 30, 2025 · US 12,510,006Granted
- Thermal Energy Storage System Coupled To A Solid Oxide System And A Thermal Cascade Heat ExchangerDec 25, 2025 · Application 19249867Pending
- Thermal Energy Storage System With Steam Generation System Including Flow Control And Energy CogenerationDec 18, 2025 · Application 19239704Pending
- Thermal Energy Storage System with Radiation CavitiesDec 16, 2025 · US 12,497,910Granted
- Thermal Energy Storage Systems For Use In Material ProcessingDec 2, 2025 · US 12,486,789Granted
- Thermal Energy Storage System For Simple And Combined Cycle Power GenerationNov 25, 2025 · US 12,480,719Granted
- Thermal Energy Storage System Coupled With Thermal Power Cycle SystemsOct 7, 2025 · US 12,435,648Granted
- Thermal Energy Storage System Coupled With A Solid Oxide Electrolysis SystemJul 31, 2025 · Application 18915679Pending
- Thermal Energy Storage System With Steam Generation System Including Flow Control And Energy CogenerationJul 22, 2025 · US 12,366,180Granted
- Thermal Energy Storage Systems For Repowering Existing Power Plants For Improving Efficiency And SafetyJul 15, 2025 · US 12,359,591Granted
- Thermal Energy Storage Systems With Improved Seismic StabilityJul 8, 2025 · US 12,352,505Granted
- Thermal Energy Storage System with Deep DischargeJun 3, 2025 · US 12,320,277Granted
- Thermal Energy Storage Systems For Use In Material ProcessingMay 6, 2025 · US 12,291,982Granted
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Regulatory activity · Energy
- Air Plan Approval; Michigan; Redesignation and Maintenance Plan for the Partial St. Clair 2010 1-Hour Sulfur Dioxide (SO2) NAAQS Nonattainment AreaEnvironmental Protection Agency
- Air Plan Approval; Delaware; 2006 24-Hour Fine Particulate Matter Limited Maintenance Plan for the Philadelphia Nonattainment AreaEnvironmental Protection Agency
- Air Plan Approval; Oklahoma; Updates to the State Implementation Plan for New Source Review Permitting and General SIP ProvisionsEnvironmental Protection Agency
- List of Approved Spent Fuel Storage Casks: NAC International, Inc., MAGNASTOR® Storage System, Certificate of Compliance No. 1031, Amendment Nos. 16 and 17 and Revisions to Amendment Nos. 0 Through 16Nuclear Regulatory Commission
- Epyrifenacil; Pesticide TolerancesEnvironmental Protection Agency
- Fluoxapiprolin; Pesticide TolerancesEnvironmental Protection Agency
Rules are matched to sector, not to company. Recent activity in a sector is context rather than a signal about this business — until rules are matched to what a company actually builds, the section is shown as context and nothing more.
Sources
Federal grants from SBIR/STTR, NIH, NSF and DoD records. Federal contracts from USAspending.gov. Private capital from SEC Form D. Patents from USPTO. Publications from OpenAlex. Regulatory activity from the Federal Register. Press matched on company name.
How to read this page
Figures show associations in public records, not causes or predictions. Nothing here is investment advice. An em-dash means no record was found under this company's name, not that none exists.
Data freshness
SEC Form D filings through . SBIR and STTR awards through .