Company Insights

GWH customer relationships

Explore interactive graphBrowse insights index
GWH customer relationship map

How ESS (GWH) Monetizes Through Tier‑1 Utilities, Defense Contracts and Hyperscaler Partnerships

Thesis: ESS (NYSE: GWH) designs and sells iron flow battery systems and captures revenue through hardware sales, extended warranties and recurring service contracts; the company is building commercial scale via long‑term frameworks with large utilities, targeted defense procurements and offtake/cost‑sharing arrangements with hyperscalers. Revenue today is limited but strategically concentrated in a pipeline of Tier‑1 customers and pilot projects that validate technology and open larger spend bands.
Explore how these customer relationships translate into commercial scale at https://nullexposure.com/.

The customer map: Tier‑1 utilities, defense and hyperscalers

Below I list every customer relationship cited by the company and in public reporting, with a short, investor‑oriented takeaway and the primary source.

  • Salt River Project (SRP) — ESS announced a 50 MWh Energy Base pilot and later Project New Horizon, a 5 MW / 50 MWh system to be installed at SRP’s Copper Crossing Energy and Research Center in Florence, Arizona, and SRP figures prominently in the company’s decade‑long commercial plans. According to GWH’s Q3 2025 earnings call and subsequent Q4 2025 commentary, SRP is a headline Tier‑1 utility customer driving near‑term deployments (Q3 & Q4 2025 earnings calls; project press coverage in FY2025–FY2026).

  • Sacramento Municipal Utility District (SMUD) — Listed by management among Tier‑1 utility customers that comprise ESS’s pipeline; SMUD is presented as an active utility relationship in company remarks (GWH Q3 2025 earnings call).

  • Portland General Electric (POR) — Cited by management as one of the Tier‑1 utility partners contributing to ESS’s utility pipeline and proof points for grid‑scale applications (GWH Q3 2025 earnings call, FY2025).

  • SB Energy (SBE) — ESS maintains a long‑standing framework relationship with an affiliate of SB Energy; the arrangement established ongoing commercial engagement and a prospect pipeline for equipment deployments. The framework agreement (originally documented in 2021) is a structural commercial conduit for future orders (company filing describing the Framework Agreement; referenced in GWH Q3 2025 remarks).

  • Honeywell (HON) — Honeywell has purchased systems and paid reimbursable expenses; management reported revenue recognition tied to Honeywell for sales and start‑up activity in 2024, positioning Honeywell as a commercial customer that has completed transactional deployments (company revenue disclosures and Q3 2025 earnings call, FY2024–FY2025).

  • Google (GOOGL) — Google has been confirmed as an offtaker for Project New Horizon and will provide cost‑sharing plus multiyear operational testing, giving ESS a valuable commercial validation partner and a path to scale through a hyperscaler offtake model (GWH Q4 2025 earnings call and FY2026 public remarks).

  • U.S. Air Force / United States Air Force Research Laboratory (AFRL) — ESS executed a $9.9 million contract tied to Concurrent Technologies Corporation and AFRL for a long‑duration energy storage system to be deployed at Clear Space Force Station in Alaska; this defense award signals traction in mission‑critical, resilience‑focused applications (Business Wire / company press release, Jan 29, 2026; GWH Q4 2025 earnings call).

  • Concurrent Technologies Corporation (CTC) — CTC is the prime (or contracting partner) on the $9.9 million AFRL award, contracting ESS for the long‑duration system deployment at Clear Space Force Station; public releases list CTC alongside AFRL for the FY2026 contract (Business Wire & subsequent news coverage, FY2026).

Each of the above entries is drawn from the company’s earnings commentary and contemporaneous press releases and reporting (Q3/Q4 2025 earnings calls; Business Wire/Yahoo/InsiderMonkey and FY2025–FY2026 news coverage).

What these relationships tell investors about GWH’s operating model

  • Contracting posture: long‑term frameworks plus project‑level contracts. Company filings document a non‑binding framework with an affiliate of SB Energy and extended‑warranty purchase options; those elements show ESS pursues both framework agreements to seed large pipelines and discrete project awards to monetize near term. The framework with SB Energy was established in 2021 (company filing / framework agreement disclosure).

  • Concentration and spend profile: large but lumpy. Management discloses pipeline opportunities that are material in scale — company statements reference a framework that supports more than $300 million in potential revenue at current prices and volumes, while discrete contracts (for example the $9.9M AFRL award) populate the near‑term order book. These signals point to a commercial model where a few large customers drive the majority of booked and prospective spend (company statements and supply/framing disclosures, FY2025).

  • Criticality: resilience and mission‑critical infrastructure. Customer mix spans regulated utilities (SRP, SMUD, PGE), defense (AFRL/U.S. Air Force) and hyperscalers (Google), indicating ESS targets grid resilience, back‑up power and long‑duration use cases where reliability and lifecycle performance are critical to buyers (earnings calls and project announcements, FY2025–FY2026).

  • Maturity of relationships: a spectrum from prospect to active deployment. The company narrative and filings describe pilot deployments and active orders alongside framework prospects that have not yet converted to firm purchase orders — that mix implies revenue will scale only as pilot successes convert to repeat, long‑term procurements (Q3/Q4 2025 remarks; company filings).

  • Geography: North America base with global applicability. Revenue historically registers in the U.S. but management emphasizes the product’s suitability for global deployments, signaling U.S. concentration today and optionality overseas as scale and certifications expand (company revenue disclosure and product positioning, FY2024–FY2025).

(These points synthesize company‑level constraints and disclosures; the framework agreement referenced explicitly names an SBE affiliate and is therefore a relationship‑level signal tied to SB Energy.)

Explore deeper relationship analytics and commercial signals at https://nullexposure.com/.

Investment implications: risks and upside signals

  • Upside: Validation from Tier‑1 utilities, a major hyperscaler offtake and a defense award provide three independent demand channels that de‑risk commercialization if pilots convert to multi‑site deployments. Google’s cost‑sharing and multiyear testing accelerates operational credibility (Q4 2025 commentary).

  • Risks: Revenue today is small relative to the size of cited opportunities and ESS must execute manufacturing scale‑up and hook rate to convert frameworks into cash flow. Spend bands disclosed by management imply large potential deals (> $300M frameworks) but conversion timelines are key; near‑term order flow is lumpy and sensitive to procurement cycles.

  • Near‑term catalysts to watch: SRP Project New Horizon deliveries and commissioning schedule, conversion of SB Energy framework items to firm orders, and execution on the $9.9M AFRL contract at Clear Space Force Station (Q3/Q4 2025 calls and Jan 29, 2026 press release).

If you want structured, relationship‑level risk scoring for investors and operators, see our analytic coverage at https://nullexposure.com/.

Bottom line

ESS’s customer footprint is concentrated among regulated utilities, defense procurement channels and at least one major hyperscaler partner. That combination delivers validation across commercial, mission‑critical and scale pathways, but it also means investor returns depend on a small number of large conversions from framework to firm orders and on successful manufacturing scale‑up. Track SRP deployments, SB Energy framework progress, and AFRL contract milestone delivery as the highest‑impact near‑term indicators (company earnings calls and press releases, FY2025–FY2026).

For a warm introduction to our relationship intelligence and how it can feed investment due diligence, start here: https://nullexposure.com/.