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Alameda, CA, USA · Private · rondo.com
Thermal (heated brick) batteries for industrial heat
Capital raised
Not yet sourced
Open roles
13
▼ 1 since 2026-10-30
Federal awards
—
none found
Last private raise
$25M
Form D · 2022-01-04
SEC filings
1
latest 2022-06-17
Coming up
POLICY45Y / 48E: all other clean power and storage
Full credit for projects beginning construction through 2033; 75% for 2034 starts, 50% for 2035, none from 2036. Affects Long-duration storage.
+ THESISHIRING13 open roles (-1 since Oct 30, 2026)
Biggest teams: Supply Chain 2, Structures & Insulation 2, People 1, Delivery 1.
+ THESISPROJECTRondo Energy and Rio Tinto begin design work on Australia’s largest thermal energy storage project
Energy-Storage.news: Rondo Energy and Rio Tinto have started engineering and design work on a 360MWh thermal energy storage (TES) project in Australia.
energy-storage.news →+ THESISPROJECTRondo and Rio Tinto begin FEED on 360 MWh Yarwun heat battery
Rondo and Rio Tinto started front-end engineering and design for a 360 MWh storage / 30 MW discharge heat battery at Rio Tinto's Yarwun alumina refinery near Gladstone, Queensland. ARENA funding is staged: an initial A$3.6M for FEED, then up to A$38M for deployment, plus up to A$33.3M in conditional contingency support.
prnewswire.com →+ THESISPROJECT · HOLMES WESTERN HEAT BATTERYCommercial operation: 100 MWh heat battery charged by onsite solar
Kern County, CA
energy-storage.news →+ THESISHow it works
Cheap electricity heats bricks or carbon blocks to well over 1,000°C. The stored heat comes back out as factory heat or steam hours later.
OPEN IN 3D →Others on this approach
Proof100 MWh heat battery in commercial operation at Holmes WesternOct 15, 2025canarymedia.com
NextLarger industrial heat batteries
Supply-chain security
Secured · Contracted · At risk · Unknown — rated only on public evidence; Unknown means nothing has been disclosed.
Sources: company job boards (daily), SEC EDGAR, USAspending.gov, and the reviewed technology spreadsheets. Public records only cover US entities, so foreign companies and private firms that don't file will show gaps.
Read from SEC 8-Ks (bankruptcy, default, delisting, restatement, impairment, restructuring), cash runway in annual reports, Form D raises and the 30-day hiring trend. A prompt to look closer, not a credit rating.
2026-10-302026-11-09
Teams moving over 30 days: New Products +1 (now 1), Quality -1 (now 0), Electrical Engineering -1 (now 0)
By team
By location
Companies file a Form D within 15 days of selling shares privately. “Sold” is the amount raised so far in that offering; amended notices (D/A) update earlier ones.
| First sale | Notice | Offered | Sold |
|---|---|---|---|
| 2022-01-04 | D · filed 2022-06-17 | $25M | $25M |
No federal grants, contracts or loans found on USAspending.gov under this company's US entity name.
Policy that applies
No minerals, policies or partners linked yet. Add them in the review spreadsheet.
2026-10-21 · project
Rondo Energy and Rio Tinto begin design work on Australia’s largest thermal energy storage projectEnergy-Storage.news: Rondo Energy and Rio Tinto have started engineering and design work on a 360MWh thermal energy storage (TES) project in Australia.2026-10-20 · project
Rondo and Rio Tinto begin FEED on 360 MWh Yarwun heat batteryRondo and Rio Tinto started front-end engineering and design for a 360 MWh storage / 30 MW discharge heat battery at Rio Tinto's Yarwun alumina refinery near Gladstone, Queensland. ARENA funding is staged: an initial A$3.6M for FEED, then up to A$38M for deployment, plus up to A$33.3M in conditional contingency support.Only Form D notices on file (shown at left).