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Toronto, Canada · Private · hydrostor.ca
Advanced compressed-air storage in underground caverns
Open roles
—
no public job board
Federal awards
—
none found
Last private raise
$0
Form D · 2025-11-21
SEC filings
2
latest 2025-11-21
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, Willow Rock Energy Storage Center.
+ THESISPROJECTGreater Napanee council backs Hydrostor project changes ahead of IESO bid
After a Sept. 22, 2026 deputation by Hydrostor, Greater Napanee council agreed to project enhancements; the company said raising capacity to 650 MW would make its IESO bid more competitive. Municipal support had been granted in May.
kingstonist.com →+ THESISREGULATORYSilver City receives AEMO and Transgrid grid connection approval in Australia
The 200 MW/1,600 MWh Silver City project in Broken Hill, NSW received grid connection approval from AEMO and Transgrid, confirming it meets Generator Performance Standards; the company says it is near shovel-ready.
hydrostor.ca →+ THESISFUNDINGHydrostor closes US$230M equity investment for A-CAES pipeline
Hydrostor secured a $230M USD equity investment, including previously announced convertible-note funding from Canada Growth Fund, Goldman Sachs Alternatives and CPP Investments, plus a strategic round with Baker Hughes, Hatch and Realize Capital Partners. Proceeds fund the 7 GW global pipeline and Willow Rock financial close later in 2026.
hydrostor.ca →+ THESISCONTRACTWillow Rock signs offtake agreement with Southern California community choice aggregator
Hydrostor's 500 MW Willow Rock Energy Storage Center signed an offtake agreement with a Southern California Community Choice Aggregator, per the company newsroom listing; trade press reported a 60-MW offtake deal.
hydrostor.ca →+ THESISPROJECT · WILLOW ROCK ENERGY STORAGE CENTERGroundbreaking (planned mid-2026)
Rosamond, Kern County, CA
utilitydive.com →+ THESISLICENSING · WILLOW ROCK ENERGY STORAGE CENTERCalifornia Energy Commission final license
Rosamond, Kern County, CA
utilitydive.com →+ THESISFUNDING · SEC FORM Dprivate raise reported
sec.gov →+ THESISFUNDING · WILLOW ROCK ENERGY STORAGE CENTEREquity: Goldman Sachs Asset Management; CPP Investments$300M
Closed · Company-level backing (over $300M) plus committed project equity
energy-storage.news →+ THESISFUNDING · WILLOW ROCK ENERGY STORAGE CENTERDOE loan: DOE Loan Programs Office$1.8B
Under review · Conditional commitment for a loan guarantee; placed under review after the Jan 2025 change of administration
energy-storage.news →+ THESISPROJECT · WILLOW ROCK ENERGY STORAGE CENTERDOE conditional commitment up to $1.76B
Rosamond, Kern County, CA
energy-storage.news →+ THESISHow it works
Spare power squeezes air into an underground cavern; a column of water keeps it at steady pressure. Releasing the air through a turbine makes power again.
OPEN IN 3D →ProofOperates a small compressed-air storage facility in Goderich, Ontarioenergy-storage.news
NextWillow Rock (permitted; groundbreaking planned)
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.
Public $1.8BPrivate $300Mincl. $1.8B conditional or pending
Money behind this company's projects. Company-wide raises are listed but not counted in totals.
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.
No public job board on Greenhouse, Lever or Ashby, so hiring isn't tracked for this company yet.
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 |
|---|---|---|---|
| — | D · filed 2025-11-21 | open-ended | $0 |
| — | D · filed 2021-12-22 | open-ended | $0 |
No federal grants, contracts or loans found on USAspending.gov under this company's US entity name.
STEP 2/4 · AT RISK Willow Rock's $1.76B conditional loan in limboThe project is permitted but its federal loan guarantee is still under review.
Policy that applies
No minerals, policies or partners linked yet. Add them in the review spreadsheet.
2026-09-24 · project
Greater Napanee council backs Hydrostor project changes ahead of IESO bidAfter a Sept. 22, 2026 deputation by Hydrostor, Greater Napanee council agreed to project enhancements; the company said raising capacity to 650 MW would make its IESO bid more competitive. Municipal support had been granted in May.2026-09-01 · regulatory
Silver City receives AEMO and Transgrid grid connection approval in AustraliaThe 200 MW/1,600 MWh Silver City project in Broken Hill, NSW received grid connection approval from AEMO and Transgrid, confirming it meets Generator Performance Standards; the company says it is near shovel-ready.2026-08-12 · funding
Hydrostor closes US$230M equity investment for A-CAES pipelineHydrostor secured a $230M USD equity investment, including previously announced convertible-note funding from Canada Growth Fund, Goldman Sachs Alternatives and CPP Investments, plus a strategic round with Baker Hughes, Hatch and Realize Capital Partners. Proceeds fund the 7 GW global pipeline and Willow Rock financial close later in 2026.2026-08-06 · contract
Willow Rock signs offtake agreement with Southern California community choice aggregatorHydrostor's 500 MW Willow Rock Energy Storage Center signed an offtake agreement with a Southern California Community Choice Aggregator, per the company newsroom listing; trade press reported a 60-MW offtake deal.Only Form D notices on file (shown at left).