The archive · Climate & Energy · Operational decision · 2020–2024
Moxion battery gamble ends in liquidation
Moxion, founded 2020, bet on 600kWh batteries replacing diesel generators; ceased operations July 2024, filed Chapter 7, founder returned 2025.
Moxion Power
What the business is
Moxion built towable battery systems of 75kW and 600kWh or more to replace diesel generators at music festivals, construction sites, disaster relief operations, and film shooting sites; customers could buy or rent them.
Starting capital：Cumulative funding was $110M+, including a $100M Series B in 2022-09 led by Tamarack Global, with Amazon, Microsoft, Sunbelt Rentals, and others participating.
How it started
Paul Huelskamp founded Moxion in Richmond, California, betting on converting mobile power from fuel to electricity: music festivals, construction sites, disaster relief, and film production all needed on-site power, while generators burned diesel, were noisy, and had high carbon emissions. In September 2022 the company raised a $100M Series B; investors included Amazon, Microsoft, and equipment rental giant Sunbelt. Sunbelt's multi-million-dollar orders were later treated by management as evidence that 'the product was already mature'.
What happened
The company expanded its team to more than 400 people. In January 2024 it signed a 100,000-square-foot new factory and held a launch ceremony for a new manufacturing plant with 7GWh capacity, attended by California Governor Gavin Newsom. But the product had hard flaws: it had no bidirectional charging, the battery could not charge and discharge at the same time, and customer utilization was low. Capacity was deployed before technical problems were solved, and fixing hardware afterward was expensive and slow. In February 2024 Bloomberg Law reported that the company wanted to raise $200M at a $1.5B valuation, but this coincided with a downturn in climate tech funding and no deal was reached.
How it ended up
Already failed: on July 26, 2024, a founder email announced immediate cessation of operations. A week earlier, the company had furloughed most of the 400 employees, then laid off all of them. In August 2024 the company filed for Chapter 7 liquidation. Liabilities were estimated at $100M–$500M; the largest secured creditor, Silicon Valley Bank (硅谷银行), claimed $33M+, and the company had only $201,980 left on its books.
Background
Moxion Power, founded ~2020 in Richmond, CA, by Paul Huelskamp, aimed to replace diesel generators with towable batteries (75kW, 600kWh+) for events, construction, disaster relief, film. Raised $100M Series B in Sept 2022 from Amazon, Microsoft, Sunbelt; total $110M+.
Turning point: Sunbelt invested and ordered millions, leading to 'expand first, validate later'. Team grew to 400+, signed 100k sq ft factory, launched 7GWh plant. But product lacked bidirectional charging, low utilization; capacity deployed before fixes, costly to correct. Feb 2024 tried $200M raise at $1.5B valuation, failed due to climate funding downturn.
Outcome: July 26, 2024, founder email announced immediate cessation, 400+ laid off. Aug filed Chapter 7. Liabilities $100M–$500M; Silicon Valley Bank claimed $33M+; only $201,980 left, couldn't pay severance.
Sept 2025: Huelskamp and ex-employees founded Anode Technology, raised $9M seed led by Eclipse, used contract manufacturers, smaller battery, learned from Moxion's over-expansion.
What has to be true
- Mistook Sunbelt's trust for validation: invested and ordered millions, leading to full expansion instead of small-scale tech validation.
- Scaled before hardware polished: no bidirectional charging, low utilization; fixing was expensive and slow, amplified by scale.
- Demand brought forward: built 7GWh factory, signed 100k sq ft, bet on unvalidated growth.
- Capital window closed: 2024 climate funding downturn, $200M round failed, only $201,980 left, couldn't pay severance.
What can be applied
Major-customer orders aren't product-market fit; scaling before validation creates sunk costs. Once funding closes, no chance to shrink.
Aftermath
As of 2025-09-26: Moxion's assets had been disposed of in Chapter 7 liquidation, more than 400 employees were laid off, and the company no longer exists. Founder Paul Huelskamp and several former employees established Anode Technology Company, raised a $9M seed round led by Eclipse, switched to contract manufacturers, made the battery smaller, and still targeted mobile power for EV charging, construction sites, and event sites. They publicly wrote 'do not expand production too early, do not bring all manufacturing in-house' into the new company's playbook.
Sources
- Battery startup Moxion went bankrupt. Now its founder is back to 'finish what we started.'
- Portable battery startup Moxion is bankrupt. What happened?
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