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Hunterbrook InvestigationsCodex · 实盘可交易 · 做空市场:美股▼ 亏 -13.18% · 已结算把握 5/10🔁 +2 同一事件
北京时间·🕒 发布 02:00:38时区推断·⟳ 抓取 02:02:25·⚡ 决策 07-31 02:12:18 +9m53s·88.5 天前

Hunterbrook发布做空报告称Bloom燃料电池效率和输出长期低于披露基准

Hunterbrook基于美国多州、韩国和EIA公开计量数据称Bloom多批燃料电池在约两年内跌破效率保证线,直接打击其AI数据中心供电叙事。

📄 原文Hunterbrook Investigations↗ 原文
Do Bloom's Fuel Cells Work as Claimed? Data Says No
Based on Hunterbrook Media’s reporting, at the time of publication Hunterbrook Capital is short $BE and long a basket o…
▼ 做空Bloom EnergyBE.US🇺🇸试探仓
▼ 亏 -13.18%入场 07-30 盘中首笔 @204.13 → 离场 07-31 开盘 @230.78
150.00250.00204.13做空 07-30离场 07-3107-0809-11
日 K 取自复盘打分切片 · 蓝点/蓝虚线 = 纸面入场价 · 灰虚线 = 纸面离场 · 持有期红底 = 赚(做空:价格在入场线下方)、绿底 = 亏
💡 交易逻辑短报质疑核心效率,盘中做空反应窗口
怎么做空 立刻做空 不设价格下限(市价成交)
怎么平空 止盈 -5%(半仓)/-10%(清仓) · 止损 +7% · 时间止损 2日
展开详情(成交明细 / 研究档案 / 原文全文 / 决策记录链)

分时走势

做空 BE.US Bloom Energy

建仓日早于近 30 天,只有日线图

成交明细 · 纸面

做空 BE.US Bloom Energy

收益状态-13.18% 已平仓
进场成交2026-07-30 · 盘中首笔 · 07-31 02:04 北京 · @204.131
离场成交2026-07-31 · 开盘 · @230.775
毛收益-13.05%
成本+0.13%
净收益-13.18%
计入收益-13.18%
建仓日2026-07-30 · 进场不早于新闻时刻 + 2 分钟

收益口径 event_time_plus_2min_10min_walk_open_topup_to_next_open_exchange_calendar_fill_model_local_notional_v9 · method_id m8db1cbc8f2d · 截至 2026-10-27 14:42

研究档案

🔎 新鲜度:最早出现 2026-07-30 · 扩散 low · price-in 风险 medium ↗ ↗

消息传播链

  1. 2026-07-30 14:00 ET首发Hunterbrook Investigations一手源原文 ↗
    Hunterbrook首发第二篇Bloom调查,称公开计量数据指向效率、输出和替换周期系统性低于公司披露基准。
  2. 2026-07-30 14:02 ET市场反应Futu/stock_quote非一手
    抓取时BE.US仍报205.06美元,较前收163.75美元上涨25.23%,短报尚未被充分消化。
    市场反应:BE.US盘中+25.23%,20日累计-28.91%,当日成交额约51.0亿美元。
  3. 2026-07-30官方确认/否认Hunterbrook正文转述非一手原文 ↗
    正文称Bloom未回复本篇重复置评请求,但此前对Hunterbrook上一份报告曾提交8-K并称其拒绝相关指控。

关键理由

  • Hunterbrook基于美国多州、韩国和EIA公开计量数据称Bloom多批燃料电池在约两年内跌破效率保证线,直接打击其AI数据中心供电叙事。
  • Bloom现有估值约604亿美元,而内部定量库显示2025年燃料电池收入约15.3亿美元、Oracle/Nebius等AI数据中心订单是核心重估来源;若80%-90%实际输出和更频繁替换成立,会抬高客户总拥有成本并压缩服务经济性。
  • 先例显示短报首日最容易产生冲击,但高相似样本不足且同公司2019年短报后1-3日曾修复,因此只保留盘中试探空单、缩短持有期。

主要风险

  • Hunterbrook披露其基金做空BE,报告有立场偏向;Bloom此前对Hunterbrook类似指控提交8-K反驳,若公司迅速用合同口径或新一代产品数据澄清,应立即降低空头。
  • BE.US当日受财报、Oracle/Brookfield数据中心需求叙事推动大涨且波动率高,短线存在逼空和正面订单新闻覆盖短报的风险。

反向证据

  • 做空前查反向 · 来源 kb_search · 日期 2026-07-03 · 影响 weakens
    内部KB命中离职专家交流,称Brookfield合作从50亿美元扩至250亿美元,AI数据中心客户占比约70%,燃料电池具备快速部署和load following优势。
    检索:Bloom Energy recent bullish earnings guidance Oracle Brookfield AI data center demand July 2026 原文 ↗
  • 做空前查反向 · 来源 query_modeling_kb · 日期 2026-06-06 · 影响 supports
    定量库显示Bloom为SOFC商业化龙头,2025燃料电池收入约15.3亿美元、销量487MW,Oracle/Nebius订单是核心增长来源;这既说明敞口重大,也说明短报若成立会打击核心逻辑。
    检索:Bloom Energy data center power fuel cell efficiency output Oracle 2.45GW service revenue
  • 做空前查反向 · 来源 kb_search · 日期 2026-07-03 · 影响 none
    未命中对本篇性能数据的公司正式反驳,主要反向证据仍是此前专家和订单侧多头叙事。
    检索:Bloom Energy short report rebuttal reliability fuel cell performance efficiency guarantee customer penalties July 2026 原文 ↗

先例如何影响了这次决策

对本次决策的影响:先例没有推翻做空,但明确压仓位、缩短time stop并收紧止盈,避免把Hunterbrook报告当成可持有多日的大空头趋势。

方向:相似度加权后3日胜率仅约42%、加权中位约-0.6%,方向不强;但高相似SMCI显示AI基础设施拥挤股可继续下跌。

涨幅量级:高相似且锚干净样本只有BE 2019一条,+3日+0.3%、+5日-2.1%,不足以支撑大目标位;因此把止盈从8/15%收至5/10%。

形态:BE 2019、CLOV、RBLX显示短报首日急跌后容易修复;SMCI、IEP显示击中核心估值支撑时可连续下探,当前更像二者之间。

历史先例(按相似度)

  • 相似度 9/10 BE 2019-09-17 Hindenburg发布Bloom报告,质疑燃料电池经济性、替换寿命和服务负债。 原文 ↗
    事件后 +1日 +0.9% · +2日 +7.2% · +3日 +0.3% · +4日 +3.6% · +5日 -2.1%
    相似度依据:同一公司、同一燃料电池寿命/效率核心质疑,同市场同相位;区别是当前叙事更绑定AI数据中心且估值更高。
    经验:同公司旧短报事件日已跌21%,随后1-5日没有继续单边下跌,说明做空最好抓首日扩散窗口而非延长持有。
  • 相似度 8/10 SMCI 2024-08-27 Hindenburg发布Super Micro报告,质疑AI服务器龙头会计操纵和关联交易。 原文 ↗
    事件后 +1日 -19.0% · +2日 -18.0% · +3日 -20.1% · +4日 -19.3% · +5日 -22.7%
    ⚠锚前1-2日已异动8.3%>锚定日2.6% — 该行涨幅别用来定止盈止损
    相似度依据:同为AI基础设施高飞股被短报打核心可信度和客户叙事,行业相位接近;但SMCI会计问题更硬。
    经验:AI基础设施拥挤多头一旦被短报击中核心可信度,第二天可能继续大幅下探,适合小仓抓扩散而非逆势抄底。
  • 相似度 7/10 CVNA 2025-01-02 Hindenburg发布Carvana报告,称扭亏叙事是会计和关联交易支撑。 原文 ↗
    事件后 +1日 -11.2% · +2日 -5.4% · +3日 -0.6% · +4日 -1.3% · +5日 -3.3%
    ⚠锚前1-2日已异动5.5%>锚定日1.9% — 该行涨幅别用来定止盈止损
    相似度依据:同为暴涨后高估值股遭短报质疑核心财务/经营质量,但Carvana不是AI供电硬件。
    经验:暴涨拥挤股被短报打击后仍可能延续数日下行,但锚前已跌时后续收益会被低估,不能盲目外推。
  • 相似度 6/10 IEP 2023-05-02 Hindenburg发布Icahn Enterprises报告,称NAV高估且分红结构不可持续。 原文 ↗
    事件后 +1日 -19.3% · +2日 -25.4% · +3日 -5.5% · +4日 -9.3% · +5日 -5.9%
    相似度依据:都是做空机构直接打核心估值支撑且市值较大,但IEP更偏财务结构和分红。
    经验:当短报直击估值支撑且可量化时,事件后仍可能连续下跌,但这种幅度不应套到产品性能争议。
  • 相似度 5/10 DKNG 2021-06-15 Hindenburg发布DraftKings报告,称SBTech黑市博彩暴露监管和收入风险。 原文 ↗
    事件后 +1日 +0.6% · +2日 +1.4% · +3日 -0.9% · +4日 +1.0% · +5日 +3.4%
    相似度依据:同为高估值成长股短报,但DraftKings偏合规收入质量,Bloom偏核心产品性能。
    经验:非硬证伪的合规短报容易在首日低点后修复,追空需要控制有效期。
  • 相似度 5/10 RBLX 2024-10-08 Hindenburg发布Roblox报告,称DAU和时长指标夸大且儿童安全问题严重。 原文 ↗
    事件后 +1日 +3.0% · +2日 +2.2% · +3日 +2.7% · +4日 +0.7% · +5日 +0.6%
    相似度依据:都是第三方数据质疑核心运营指标,但Roblox不是硬件履约问题且业务反证更易被用户增长覆盖。
    经验:外部数据质疑若没有公司/监管跟进,首日跌幅后很快反弹,空头必须有止损和短期限。
  • 相似度 5/10 CLOV 2021-02-04 Hindenburg发布Clover Health报告,披露未公开DOJ调查和销售模式问题。 原文 ↗
    事件后 +1日 +5.7% · +2日 +1.1% · +3日 +7.6% · +4日 +2.2% · +5日 -1.8%
    相似度依据:都是做空机构用调查证据打高增长叙事,但行业和证据机制差异较大。
    经验:监管/销售类短报若未迅速引发新增事实,事件日急跌后可被资金回补,不能用作扩大空头仓位依据。
工具调用 · 历史记录,结果未知(7 种)
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  • query_modeling_kb · 结果未知
  • kb_search · 结果未知
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  • event_study · 结果未知

原文全文

展开原文 · 31,633 字
Based on Hunterbrook Media’s reporting, at the time of publication Hunterbrook Capital is short $BE and long a basket of comparable securities. Positions may change at any time. This article is not investment advice or any recommendation. See full disclosures below.
- Hunterbrook compiled a record of Bloom's fuel cell performance from public data spanning 15 years: government datasets across the U.S. (New York, Delaware, California) and South Korea, as well as self-reported federal filings covering 126 plants in nine U.S. states.
- Across the datasets, the fuel cells’ measured efficiency appears to fall below Bloom’s disclosed benchmarks before the five-year replacement interval the company claims. In New York, Hunterbrook calculated that all 37 systems fell below Bloom’s efficiency benchmark at a median of 20 months, with only one declining slowly enough to be on pace to stay above it for five years. In California, 105 of the 231 projects with usable fuel data recorded at least one month below the level at which a 2025 contract requires Bloom to repair or replace the system. And even on cumulative lifetime efficiency, the measure Bloom most typically uses, 44 of the 126 plants in the federal record fall below the guarantee line.
- Bloom's 95% output benchmark — a measure of how much electricity the cells actually produce against their rated capacity — was missed almost everywhere, almost always: 152 of 156 months in Delaware, 97.4% of months in California, and 22 of the last 24 months at one of Bloom's largest continuously metered Korean plants.
- The public data is reported daily or monthly, so Hunterbrook uses those intervals to track the timing and persistence of underperformance — not to determine any potential contractual breach, which may be assessed monthly, annually, or cumulatively depending on the contract.
- A part-owner of a Bloom project in New York told Hunterbrook the company paid their group a multimillion-dollar contractual penalty after failing to meet one of its guarantees.
- Some customers report adequate performance: One said Bloom "remains in compliance with our contract," and a California operator called their project "fairly reliable," but won't buy more, citing price. Other customers said they no longer work with Bloom.
- Hunterbrook’s findings directly implicate Bloom’s data center ambitions. Based on these numbers, fuel cells may be a less attractive alternative to grid power and gas turbines than they appear on paper: Given the consistently low efficiency and output numbers across Bloom’s projects, data center operators would likely have to use more gas and install more fuel cells (and replace them more frequently) than typically modeled to reach the desired capacity. It’s, perhaps, one explanation for why Bloom has only named several partners.
- Bloom did not reply to Hunterbrook’s repeated requests for comment for this article. After Hunterbrook published its prior investigation, Bloom filed an 8-K form with the SEC as a rebuttal, claiming it “categorically rejects the Report’s claims regarding the Company’s financial results and accounting.”
It’s always been a good story: a box that turns gas into electricity through a chemical reaction, with no combustion required.
Since the early 2000s, that has been Bloom Energy’s ($BE) promise — and it's one fit for the AI era as data center developers scramble to improve what they call “time to power.”
Earlier this year, Bloom briefly reached a market cap of about $100 billion, with the stock up roughly 1,000% over the preceding 12 months. This came as Bloom announced splashy deals with partners like Oracle, which agreed to purchase up to 2.45 gigawatts of fuel cells for its flagship site in New Mexico.
This month, Hunterbrook reported cracks in Bloom’s story, including the company’s sourcing of a key rare earth ingredient, scandium, from China, a practice the company has repeatedly and publicly denied. Hunterbrook also detailed delays across Bloom’s biggest planned projects, at least one of which has wobbled further in recent weeks.
But beyond those headwinds lies a more elemental question, which Hunterbrook has investigated through state regulatory filings, foreign generation data, and interviews with Bloom customers and former employees.
Do the fuel cells actually work as advertised?
The answer appears to be no — at least according to the data.
That could present a big problem for Bloom’s data center ambitions.
None of the Bloom deployments in the public record approaches gigawatt data center scale; the largest sites Bloom has disclosed anywhere are a pair of 40-megawatt plants in South Korea.
The AI commitments are of a different order: Oracle's Project Jupiter arrangement alone is 10 times the size of Bloom's entire metered U.S. fleet.
On Tuesday’s earnings call, CEO KR Sridhar listed “reliability without overbuild” among the capabilities that other commercial vendors cannot provide. The public record Hunterbrook analyzed points the other way: Across the metered fleet, Bloom’s fuel cells have typically delivered 80 to 90% of rated output, below the 95% number Bloom has cited in the past as its typical benchmark. This means a data center operator would need to install more units and replace their stacks more often than Bloom’s previous disclosures might suggest.
If the company’s existing deployments have had problems, what does that mean for data centers requiring an order of magnitude more power, at facilities where a missed output guarantee doesn’t mean a contractual penalty but, absent costly backup, downtime for the most expensive computers on earth?
It’s a question that comes at an interesting time for Bloom. One of its largest known shareholders earlier this year was the hedge fund Situational Awareness, led by Leopold Aschenbrenner. Today, the Financial Times reported that the fund has been sold to Citadel amid a rout in its AI positions.
The Promise
On the earnings call, Sridhar said the company “kept the promise that we make to our customers. Bloom will not be your bottleneck. We will deliver power at AI speed and enable our customers to grow.” The metered record suggests that the risk isn’t whether Bloom can ship its boxes to customers quickly, but rather how those boxes perform once they are running.
While each Bloom contract is individually negotiated, the company has periodically provided windows into the typical levels of efficiency, output, and durability it promises its customers. The benchmarks we use for our analysis are derived from those disclosures, found in a 2018 filing, a 2019 technical note, a 2021 SEC filing, and a 2025 purchase order from Fresno County, CA. The key metrics:
- Efficiency guarantee: 46.9%. Efficiency measures the percentage of the energy in the gas fed to the box that comes out as electricity, and directly feeds into a customer's fuel bill per kilowatt-hour. The most recent publicly available Bloom purchase order Hunterbrook identified, signed with Fresno County, CA, in 2025, guarantees that number will be at least the equivalent of 48.8%.1 According to that contract, if, at the end of each calendar year, the system’s cumulative efficiency is below that number, Bloom must pay liquidated damages. Earlier filings disclosed that its contracts typically set the efficiency benchmark at the equivalent of 46.9%, and to be conservative our analysis tests the fleet against that older, lower number. We call this benchmark the “guarantee line” throughout this article.
- Replacement floor: 45.2%. The Fresno agreement separately requires that if cumulative efficiency, measured at the end of each calendar year, drops below this benchmark, Bloom must repair or replace the system within 90 days. We call this the “replacement floor.”
- Output guarantee: 95%. Each installed Bloom system has a rated maximum output, known as its “nameplate capacity.” The company has disclosed that it typically guarantees the system will deliver 95% of that rating, measured annually.
- Time between fuel cell component replacement: ~5 years. Bloom’s 2018 IPO prospectus told investors that in the early years, the period between stack replacements “was typically 12 to 18 months,” but that “from 2017 onwards we expect to average over five years between replacements.” When Hindenburg Research challenged that math in September 2019, Bloom responded that its latest-generation fuel cells shipped from 2016 to 2018 “have an average life of 4.8 to 5.2 years,” and published a technical note claiming median time to replacement had improved from 1.9 years for its 2011 vintage to 4.7 years for its 2015 vintage.
Since 2021, Bloom’s regular SEC filings have stopped reporting the specific output and efficiency levels its contracts guarantee, so these sources represent the best publicly available record of what Bloom is promising its customers.2 Notably, between its 2024 and 2025 Impact Reports, Bloom made its language regarding the life of its fuel cells more conservative. In 2024, the company said: “We predict 2024 fleet medium time to refurbishment as 5 years.” In 2025, the company deleted that language, saying only: “As our fuel cells age, efficiency decreases, and replacements are made.”
And Bloom’s real-world performance can be tracked and compared to these benchmarks via the fleet the company has already deployed: at Home Depots and hospitals, malls and utility substations, in New York, Delaware, California, and South Korea, and as supplemental power for a handful of Equinix’s legacy data centers.
Much of that fleet happens to be metered by governments and state-owned utilities, so the numbers are public.
Hunterbrook compiled five of those public datasets:
- South Korea: Hourly output from Korea South-East Power’s 8.35-megawatt Bundang Phase 6 plant, commissioned in April 2019, covering January 2022 through June 2026; plus monthly output and efficiency data from Korea Southern Power’s Yeongwol plant and Korea East-West Power’s Honam and Bukpyeong plants. Hunterbrook calculated Yeongwol’s efficiency from reported generation and gas consumption; Honam and Bukpyeong’s efficiency figures were calculated and published by the utilities. A separate daily Korea East-West Power file extends the Bukpyeong record through mid-2025.
- New York: Daily NYSERDA meter readings from September 2014 through December 2025, covering efficiency and output for 37 Bloom systems.3
- Delaware: Monthly filings with the Delaware Public Service Commission from June 2012 through May 2025 — 156 consecutive months — including efficiency and output data for the roughly 30-megawatt Bloom fleet serving Delmarva Power. This fleet was updated with newer models in 2019.
- California: Monthly Self-Generation Incentive Program reports from December 2012 through October 2023 (a handful of later biogas projects extend into 2025), containing efficiency and output data for 234 Bloom projects and roughly 14,100 project-months.
- United States, National: Monthly net-generation and gas consumption data reported to the U.S. Energy Information Administration from 2011 through December 2025, covering 126 installations Hunterbrook verified as Bloom installations.
To be clear: as we said above, a meter reading below one of Bloom’s guarantee lines on a given day or month does not necessarily imply a contractual breach. We do not know the specifics of the guarantees in each Bloom contract. And the company has disclosed warranties measured monthly or quarterly, as well as performance guaranties measured annually or cumulatively. Hunterbrook uses the daily and monthly readings to track when performance declines and how long it remains below Bloom’s disclosed levels — not to determine whether every individual reading breached a particular contract.4
Measured on the cumulative efficiency metric Bloom typically uses, most systems remain above the guarantee line, though 44 of the 126 Bloom systems in the federal record fall below the guarantee level even on that measure.
But cumulative efficiency can hide the repairs and replacements required to keep that average afloat. A fresh stack would lift current performance while the system’s stronger early years stay baked into the lifetime calculation. So a passing average can conceal hardware wearing out far faster than Bloom says it should.
Taken together, the monthly meters show what the cumulative numbers obscure: Efficiency falls to Bloom’s guarantee line within roughly two years, then flattens or rebounds in patterns consistent with repair or replacement. The lifetime average may still pass, but the hardware appears to be wearing out years before Bloom’s claimed five-year replacement interval, which could pose a serious risk to the unit economics of the company’s servicing business.
South Korea
South Korea is Bloom's largest market outside the United States, using about 682 megawatts installed, or roughly 45% of the company's ~1.5-gigawatt global fleet. Nearly all of it is installed at sites through Bloom's partnership with SK ecoplant. Four of those installations are metered by Korean state power companies, and the readings are public.
One is the 8.35-megawatt Phase 6 expansion at the Bundang plant, operated by Korea South-East Power and commissioned in April 2019. The public hourly data Hunterbrook analyzed, the earliest available, begins in January 2022 and runs through June 2026.5
Bundang averaged about 95% of rated output in 2023 and has slipped every year since — to about 92% in 2025, the most recent full year, and roughly 90% in the first half of 2026. Its output shows no sustained recovery, running below Bloom's typical 95% output benchmark in 22 of its last 24 months.
Three more plants, run by Korea Southern Power and Korea East-West Power, publish enough data to track efficiency. Yeongwol reports gas consumption, allowing Hunterbrook to calculate its efficiency directly; for Honam and Bukpyeong, Hunterbrook relied on efficiency figures calculated and published by the utilities.
- Yeongwol (15 MW, online 2021): efficiency fell from about 51% to 46% in three years; output from about 95% of nameplate capacity to 77%.
- Honam (15 MW, online 2021): efficiency fell from about 51% to 46% by late 2024; output from near 100% to 78%.
- Bukpyeong (4.2 MW, online 2022): efficiency fell from about 58% to 52%, while output slipped from above nameplate to ~93% in 2024, down to ~80% by mid-2025.
Another question mark hangs over Korea. SK ecoplant, a longtime strategic partner of Bloom, with a 500 MW purchase commitment Bloom valued at $4.5 billion in product and service revenue, was determined by Korean regulators to have overstated the 2022-2023 revenues of its U.S. fuel cell subsidiary, the unit that handles its Bloom business, allegedly to inflate its valuation ahead of a planned IPO.
Regulators initially deemed the violation intentional and recommended criminal prosecution before downgrading it to "gross negligence." The IPO never happened: This spring, SK Group bought out its pre-IPO investors for roughly 1.05 trillion won (about $770 million) rather than take the company public by its July 2026 deadline.
As Hunterbrook reported in its first investigation into Bloom, months after Bloom’s relationship with SK ecoplant ended, Bloom began a new related-party partnership with Brookfield Asset Management ($BAM).
New York
New York's data covers 37 Bloom installations. Among them: Home Depot stores, Queens Center Mall, Morgan Stanley's Purchase campus, Fordham University, an IKEA in Red Hook, an Equinix data center, and a roughly 7.9-megawatt community fuel cell portfolio on Staten Island. The state meters the installations daily and posts the readings.
Straight out of the box, the 37 installations averaged 52.0%6 efficiency, about five points clear of the guarantee line. They did not stay there long. Losing an average of 2.4 percentage points a year7, every one of the 37 fell below the guarantee line at a median of 20 months, inside its second year of service. And 32 were still below it when their state-reported data ended.
Twenty-eight of the 37 decayed all the way to the replacement floor (the level at which Bloom’s contract with Fresno obliges it to repair or replace the hardware), and 13 finished below even that. Based on each installation's measured rate of decline, the median projected time to reach that floor was under three years. Only one of the 37 was on pace to last the “over five years” that Bloom tells investors its stacks now run between replacements.
Output is no better. Only seven of the 37 units cleared 95% of rated output even in their first year; every one fell short on a cumulative average. Across the fleet, output slid from roughly 90% of nameplate in year one to about 80% by the final year of data.
One caveat: the metered New York fleet skews toward Bloom's older ES-5-generation hardware. Twenty-six of the 37 units were installed in 2017-2018, and NYSERDA meters each unit for only about three years — so most of these records both begin and end in the ES-5 era, roughly 2017 to 2021. A newer batch installed in 2020 (Fordham, Equinix, the Red Hook IKEA, and the Annadale portfolio) runs through 2023, and one 2023 installation (Cablevision) runs through December 2025.
Bloom has a common response to numbers like these. After Hindenburg’s report drew on the same NYSERDA portal, the company filed a technical note arguing the state's data was misleading: metering can begin 15 to 538 days after a unit switches on, missing the high-efficiency first weeks; a handful of sites carry gas boosters or backup batteries that shave a point or two; and the right yardstick, Bloom said, is cumulative efficiency, not a unit's efficiency on any given day.
Grant the company all of it. Add back a half-percentage point for metering losses, three percentage points for ancillary equipment at the five community and resiliency sites that might have it, and even the full 538-day head start to every unit's clock, and 30 of the 37 still fall below the guarantee line within about four years. That’s inside the five-year life Bloom promises between replacements.8
Delaware
Delaware is one of Bloom's manufacturing homes and the site of its highest-profile early deployment: a roughly 30-megawatt fleet serving Delmarva Power under a state tariff. The project’s performance has been reported monthly to regulators since 2012. Importantly, Bloom replaced older-generation fuel cells with newer ones at this site in 2019, so any improvements in the technology available at that time would presumably be present in this data.
Hunterbrook compiled all 156 monthly observations. The initial 3-megawatt phase opened at roughly 52% efficiency in the summer of 2012. After the project reached its full 30-megawatt capacity in November 2013, efficiency fell below the guarantee line by August 2014 and through the replacement floor by November 2014, within a year of full buildout. From June 2015 through May 2019, annual weighted efficiency remained around 44%.
In 2019, Bloom repowered the project, doing away with the original 30 megawatts of Energy Servers and installing 27.5 megawatts of newer-generation equipment. Efficiency jumped straight back to about 52%. But the replacement stacks did exactly what the originals had done: declined, on a similar path, sliding back to about 47%, approximately the guarantee line, by 2023, before a partial rebound to roughly 49% by May 2025. That rebound could, of course, reflect maintenance or component replacements. Across the full record, the fleet's monthly efficiency was below the guarantee line in 67 of its 156 months, and below the replacement floor in 52.
Output tells the same story. Measured against the fleet's nameplate capacity in force each month (30 MW through early 2019, then 27.5 MW after the 2019 replacement), the fleet fell below Bloom’s typical 95% output guarantee in 152 of 156 months, averaging about 86%, and never once clearing 95% on a full-year average either. The 2019 replacement made no lasting difference: once the full fleet was online, it cleared the 95% guarantee just twice, both immediately after the 2019 repower, and never once in the time it was running at the full 30 MW nameplate capacity. (The only other two months above 95% came in 2012, when just 3-6 MW of the eventual fleet was installed.)
California
California is where Bloom was born, where Hindenburg found much of its 2019 evidence, and where the largest public sample of Bloom fuel cells lives. The state’s Self-Generation Incentive Program, which provided hundreds of millions of dollars in incentives to Bloom projects, requires five years of metered monthly reporting from every project it pays.
Hunterbrook analyzed 234 Bloom fuel-cell projects totaling about 92 megawatts: 14,116 project-months of data from December 2012 through October 2023 (a handful of later biogas projects extend into 2025), with the median project metered for five years — exactly the period needed to test Bloom’s five-year lifespan claim.
Almost none of that record meets the typical benchmarks. Bloom’s California project-months came in below the 95% output guarantee 97.4% of the time and below 90% in three months out of four. After excluding 20 physically impossible monthly readings above 110% capacity factor9, not one of the 234 projects averaged 95% of nameplate over its monitored life; only two cleared even 90%. The median project delivered about 84%.
The efficiency record in California largely tracks what we saw in New York.
Bloom’s projects began at a median 55.6% efficiency across their first three reported months. Median efficiency fell to 50.3% in year two, then to 49.2%, 48.5%, and 47.9% in years three through five. Of the 231 projects with usable fuel-consumption data, 105 recorded at least one month below Bloom’s 45.2% repair-or-replace threshold.
After the first year drop, the decline slows. That flattening is consistent with Bloom periodically repairing or replacing lower-performing power modules as they approach contractual thresholds, preventing the fleet average from falling much further, though the SGIP data do not identify individual replacement events.
This is the same dataset Hindenburg used in 2019, when it calculated that Bloom’s post-2016 California units were on pace to need stack replacement in under three years. That was a projection: those units had a median of 32 months on the meter at the time. The record has since added 3,450 project-months, and the answer has not changed.
America: The National Data
The U.S. Energy Information Administration collects generator characteristics annually through Form EIA-860 and publishes monthly or annual plant-level generation and fuel-consumption data through Form EIA-923, federal filings used to track power plants across the country.
The EIA does not identify the manufacturer of fuel cells in its published generator inventory. Hunterbrook identified 167 fuel-cell plants with at least one megawatt of combined fuel cell nameplate capacity and positive generation in the EIA record, then classified each plant's manufacturer by cross-referencing the Department of Energy’s stationary fuel-cell inventory, EIA operator records, and court, regulatory, and SEC filings.
Using this methodology, we were able to identify 126 as Bloom Energy (as well as 37 as FuelCell Energy, and four as part of the UTC Power and Doosan PureCell lineage). Those 126 Bloom plants total about 245 megawatts across nine states, operating from 2011 through 2025, and include installations in New Jersey, Connecticut, Massachusetts, Maryland, North Carolina, and Utah that the other datasets do not capture.10
The national record tells the regional story again. When new, the fleet ran at about 51% efficiency. Within two years it fell to roughly 47%, barely over the guarantee line. As in California and Delaware, the way that steep first-year drop collapses into a slow crawl appears to be consistent with stacks being swapped as they hit the floor (though it’s hard to know for certain). Measured the way Bloom measures it (using a system's cumulative, whole-life average), 44 of the 126 plants run below the guarantee line, and roughly 60% of the 126 never rise more than a point above it. And 110 of 111 reliably metered11 plants average below the 95% output Bloom typically guarantees.
Bloom's showcase customers fare no better. Apple, whose Maiden, North Carolina, data center Bloom spent years promoting as a clean-energy landmark, performed worst on output: its three reliably metered sites ended at a median 42.9% efficiency and delivered a median 69% of rated output — before its flagship Maiden, North Carolina plant dropped off the federal record in 2021.
Equinix, Bloom’s marquee data-center customer before the AI era with 15 sites across the fleet, delivered a median 85% of nameplate across its nine reliably metered sites, while their median efficiency ended around Bloom’s guarantee line. AT&T, Kaiser, and Intel also fell below 95% on a customer-level median.
"Multimillion-Dollar Payment"
Hunterbrook also spoke to some of the customers who lived through the decay curve.
A part-owner of one of the larger Bloom installations in New York told Hunterbrook that their group signed a service contract after being shown an independent engineering report during the sales process. The source shared this report with Hunterbrook.
The source said Bloom’s sales team also promised that the fuel cells would perform at 95% output, with a life expectancy beyond five years.
That turned out to be wildly optimistic, according to the source. "They have never been able to get beyond that time frame ... they have failures a lot quicker than that."
"Based on the contract, Bloom paid a multimillion-dollar payment to us,” the source said, because the fuel cells allegedly operated “below 95%.” The source did not provide evidence of this payment.
“The 95% is gone,” the source said. “Long gone.”
LSB Industries and NineDot Energy separately told Hunterbrook that they no longer work with Bloom.
What Bloom Gets Right — And What It Doesn't
Bloom has repeatedly pointed to returning customers as evidence that its fuel cells work. In February, CEO KR Sridhar said more than two-thirds of the company’s business came from repeat customers. In April, he put the figure at 70% to 80% of its business. During the company’s earnings call on Tuesday, he described the measure more specifically, saying roughly 80% of orders came from repeat customers.
“That speaks more loudly than anything else about how happy our customers are,” he said, days after Hunterbrook had reached out to the company for comment.
“We do not obsess on the competition,” he said. “We obsess on the customer.”
But Bloom has not identified many of the customers behind those figures. And on Tuesday’s call, CFO Simon Edwards acknowledged the ambiguity, stating, “When you see the word customer in our filings, it can mean either party, the financier that buys from us and appears in our revenue and concentration disclosures or the end customer whose demand created the deal.” Its SEC filings disclose the concentration of revenue among its largest customers without naming most of them.
To the company’s credit, the public record is not all bleak — and the data shows the potential for real generational improvement. In the New York data, 2014-2018 systems averaged roughly 83% of rated output over their lives and the newest monitored project — a 2023 Cablevision installation — has run about 94% over its life, still hitting 97% to 99% at the end of its data.
One Bloom customer told Hunterbrook that Bloom "remains in compliance with our contract" and that it continues to save money. A California dairy-digester operator said their three Bloom projects have been "fairly reliable," running "right around the contracted minimum" — though their company will not buy more, citing price, and now prefers competitor Mainspring's linear generators.
But improvement is not the same as delivering the expected number. Even the improved units often miss the typical 95% guarantee on lifetime average; the two largest 2020-vintage projects in the New York data ran near 80%. And Delaware — the one dataset long enough to watch Bloom's replacement hardware age — shows the newer stacks decaying on the same slope as the old.
That distinction has potential financial consequences. Every fuel cell Bloom ships is also a service liability. On Tuesday’s earnings call, Edwards attributed the company’s 22% service margin to “fleet performance, longer stack life and scale.” He added, “We believe we will sustain them there over the long term.” How Bloom accounts for these things makes the claim testable. Edwards explained on the call that service revenue “is recognized ratably net of guarantees while the service costs are booked as incurred….” Edwards also stated that “stack replacement in particular moves the margin quarter to quarter.”
In other words, every stack that wears out early lands directly on the margin line Edwards discussed.
Meanwhile, Bloom’s current accrued warranty liability rose from $20.0 million at Dec. 31, 2025, to $77.8 million at June 30, 2026, according to the company’s most recent quarterly filing, which attributed higher performance-guarantee costs to “the effects of fleet degradation."
If stacks last more than five years, Bloom's 10-, 15-, and 20-year service contracts can be profitable. If stacks last roughly two years in the field — as, for example, the New York median implies — then every gigawatt of AI bookings is also a gigawatt of stack replacements arriving twice as often as its stated five-year stack life implies.
That also magnifies Bloom’s scandium problem. Scandium is embedded in the fuel-cell stacks, so the faster those stacks wear out, the more scandium Bloom must source over the life of each installation.
Asked on Tuesday’s earnings call how much scandium Bloom uses and how much supply it has available, Sridhar insisted that the company could support 25 gigawatts of deployments and was not dependent on China, without addressing Hunterbrook’s reporting that Bloom has sourced the material from China despite repeatedly denying it.
Then he shut down the exchange: “Everything else is proprietary to the company. Next question.”
Our next question: Whether the product at the center of Bloom’s $50 billion valuation can actually deliver as promised.
This piece represents Hunterbrook Media’s best estimate. As always, we have laid out both what we know and how we know it. That doesn’t mean we didn’t miss something. We welcome other analyses and estimates, including from Bloom. Write to us with any math of your own at ideas@hntrbrk.com.
Dhruv Patel is an investigative journalist based in Cambridge, Massachusetts, specializing in data-driven reporting. He helps spearhead investigative coverage at The Harvard Crimson, and his reporting has been cited and discussed by The New York Times, CNN, The Boston Globe, ABC News, and BBC, where he also frequently contributes commentary. A John Harvard Scholar at Harvard College, he studies computer science and economics to leverage machine learning for accountability journalism.
Vikas Kumar joined Hunterbrook from The Capitol Forum, where he led the corporate investigations team for a decade as a senior editor. He was previously an attorney at Gordon Feinblatt, a trial attorney for the Department of Justice, and a law clerk for a federal judge. He has a J.D. from University of Virginia School of Law and a bachelor's from Emory University. Vikas is based in Maryland.

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