Overview
Moxion Power built mobile batteries for places that normally burn diesel for temporary electricity. Its trailer-mounted MP-75/600 supplied film sets, rental fleets and festivals. Sunbelt announced an order for more than 600 units; Amazon used batteries on named productions. Those were concrete customers and deployments, although neither announcement disclosed Moxion's margins or fleet-wide utilization.[1][2]
Moxion closed in July 2024 and entered Chapter 7 liquidation on August 12. Viridi subsequently acquired certain assets. The strongest explanation is a mismatch between the cost of expanding production and the cash generated by a still-developing service and sales business. Evidence supports that mechanism, but does not establish a single technical defect or disclose enough economics to assign every cause.[3][4]
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Founding Story
YC records Moxion as a 2020 company in its Winter 2021 batch and lists Paul Huelskamp and Alexander Meek. The engineering leadership also included co-founder and CTO Alex Smith, identified in his contemporary article about mobile storage. The founders pursued electricity at its last mile: construction equipment, production lighting and events need power where a permanent grid connection may be absent or inconvenient.[5][6]
The opportunity had a practical attraction. Removing engine noise and exhaust can improve conditions near performers, crews and audiences. A battery still needs charging, transport and an appropriate load. Moxion therefore sold an operating system of hardware, monitoring and service alongside the battery. Amazon described remote usage forecasts and swaps of depleted units, rather than an unlimited source of electricity.[2]
Timeline
- 2020–2021: Founded in 2020; participates in YC Winter 2021.[5]
- September 2022: Announces a $100 million Series B led by Tamarack Global, with Energy Impact Partners and strategic investors. Sunbelt had committed to a purchase agreement through 2025.[7]
- March 2023: Announces Sunbelt's order for more than 600 MP-75/600 units over the following year and unveils the smaller MP-30/200 at CONEXPO-CON/AGG.[1]
- December 2023: Reports an 11-day Candy Cane Lane deployment using more than 1,200 kWh and replacing nearly 190 gallons of diesel.[8]
- May–June 2024: Powers Mill Valley Music Festival and publishes a case study of the stage's load and energy consumption.[9]
- July–October 2024: Closes July 26; files Chapter 7 August 12. Viridi dates its asset purchase agreements September 27 and October 30.[4][3]
- 2025–2026: Viridi announces its use of the former Richmond facility. Huelskamp appears as CEO and co-founder of separate company Anode Technology Company. Sunbelt still lists Moxion equipment, subject to availability.[10][11][12]
What They Built
The MP-75/600 name described headline power and stored energy: 75 kW and roughly 600 kWh. These measures answer different questions. Power limits the equipment running at once; energy limits duration. Configuration matters too. Moxion's surviving customer-care page specifies 530 kWh usable capacity and lists 40 kW continuous output at 480 V, beneath a 75 kW maximum. An operator cannot treat the headline as continuous output in every configuration.[13]
That FAQ also specifies 19.2 kW AC charging or 40 kW DC charging. It permits AC charging while supplying a load, but excludes simultaneous DC charging and output. Thus, a high sustained load can exhaust the battery even while it charges. MoxiOS already supplied monitoring and fault warnings. The original product had software and a constrained recharge workflow.[13]
The smaller MP-30/200 was announced with 30 kW maximum continuous output and 200 kWh total storage. Moxion also described hybrid generator operation and parallel configurations. These broadened the jobs it could serve; they did not remove the need to plan energy, connections and swaps.[1]
Market Position
Sunbelt offered an established rental channel and also invested. The 2022 agreement included planned software integration and service development. This was more substantial than a promotional partnership, but an order to a rental fleet does not reveal how often end customers rent each asset.[7]
Film and events supplied specific evidence of fit. Amazon named Sitting in Bars with Cake and Bosch: Legacy. Moxion's Mill Valley case study reported a 22.03 kW main-stage peak, 370 kWh consumed and two event days without recharging that stage's unit. Those figures explain why a nominally large battery can suit intermittent event loads. The case study is company-authored and contains conflicting whole-event energy totals, so the stage example is more defensible than its aggregate savings claim.[2][9]
BottleRock independently records three units from Sunbelt and Moxion in 2023, six in 2024, and a change to CES Power for two stages in 2025. Buyers can continue adopting batteries while changing suppliers.[14]
Today, Sunbelt's Moxion listing includes telematics and hybrid operation. Viridi markets mobile storage and its ViSTA monitoring offering. Anode's site describes battery-based systems and names Huelskamp, but provides insufficient public specifications or pricing for a detailed comparison. A new entrant must compete with these continuing products and providers.[12][3][11]
Business Model
Moxion manufactured equipment for fleet purchases and also supported deployments through charging and swaps. Manufacturing requires cash before delivery; services add transport, labor and charging costs. The relevant economics therefore include each delivered unit's margin and each rental job's cost, rather than installed capacity alone. Public evidence does not disclose either sufficiently to reconstruct profitability.[1][2]
The company reported more than $110 million raised by March 2023. Its $100 million Series B announcement explicitly funded expansion at two domestic manufacturing facilities. Reported plans for a further $200 million round at a $1.5 billion valuation were financing ambitions, not a completed transaction. A proposed equity valuation cannot be compared directly with the sale price of selected assets in liquidation.[1][7][4]
Post-Mortem
Latitude reported expansion, financing difficulties and criticism from an unnamed former senior manager who considered the ramp premature. It also quoted Overdrive Energy Solutions CEO Neel Vasavada, who said his event customers were increasing use and that renting the batteries was profitable for his business. Those accounts support uneven customer fit and expensive expansion, rather than a finding that all deployments failed.[4]
The likely mechanism is that a fleet order and strategic backing supported an expansion whose cash needs exceeded what the business could finance when fundraising stopped. This remains an inference: order terms, collections, manufacturing yield, warranty costs and customer-level utilization are unavailable. A financing shock and operational mistakes can reinforce each other; the public record cannot quantify their separate effects.
A narrower customer segment might have supported a smaller operation. Film and festival examples show why quiet power has value and why load measurement matters. They do not prove that those customers could support Moxion's entire cost base. Conversely, a charging limitation does not establish a universal product failure when the original FAQ describes simultaneous AC operation.
Liquidation ended Moxion as an operating company. Viridi's asset purchases and later facility announcement describe reuse of equipment and infrastructure. Anode is a separate founder-led effort. Neither establishes that Moxion's creditors or shareholders recovered their investment.[3][10][11]
Key Lessons
- Measure the end customer's operating job. The Mill Valley stage's load and duration explain adoption better than a generator-sized headline rating.
- Keep channel orders and repeat utilization separate. Sunbelt supplied distribution and purchases; rental economics still depended on end-customer use and service costs.
- Fund expansion through the downside case. A factory plan must remain financeable if the next equity round arrives late or fails.
- Use precise environmental claims. Batteries have no exhaust during discharge; total emissions depend on charging and logistics. California's small off-road engine rules exclude diesel engines, so those rules cannot establish a general diesel-generator replacement mandate.[15]
Sources
- Sunbelt — March 2023 purchase order and MP-30/200 announcement
- Amazon — Film-set deployments and swap service
- Viridi — Bankruptcy and dated asset purchases
- Latitude Media — August 2024 reporting and attributed testimony
- YC — Moxion company and founder record
- Alex Smith — Contemporary mobile-storage article
- Moxion — September 2022 funding and Sunbelt agreement
- Moxion — Candy Cane Lane deployment
- Moxion — June 2024 Mill Valley case study
- Viridi — Former Moxion facility announcement
- Anode — Current company and leadership
- Sunbelt — Current Moxion rental listing; availability varies
- Moxion — Surviving original customer-care FAQ
- BottleRock — Named suppliers and annual deployment counts
- CARB — SORE applicability and diesel exclusion