Full-Time
Staff Reliability Engineer
Updated on 5/12/2026
Peak Energy
51-200 employees
Manufactures sodium-ion energy storage batteries
Compensation Overview
$180k - $230k/yr
Burlingame, CA, USA
In Person
 DevOps & Infrastructure (1) |
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- Bachelor's or master's degree in Electrical Engineering, Mechanical Engineering, Reliability Engineering, Materials Science, or a related field
- 5+ years of experience in hardware reliability engineering in power electronics, high-voltage systems, or consumer electronics
- Strong understanding of reliability engineering principles including statistics, data analysis, physics-of-failure, lifetime prediction models, accelerated life testing, and DFMEA
- Demonstrated ability to independently lead product reliability through multiple stages of development
- Proficiency using statistical analysis tools in Python or equivalent for modeling and data analysis
- Strong documentation and technical communication skills — able to clearly present findings and reliability principles to cross-functional and leadership teams
- Ability to think critically and act decisively to efficiently grow reliability confidence in a fast-paced startup environment
- Take independent DfR ownership for existing subsystem reliability and a lead DfR role for future products, with a focus on HV electronics, devices, and power conversion
- Fully develop reliability test programs (DV, PV, ORT) by leading DFMEA, defining mission profiles, analyzing test acceleration, and specifying test requirements
- Build and contribute to custom Python reliability analysis and modeling tools to automate workflows for life prediction, test design, test/field data, and reporting
- Define reliability requirements and acceptance criteria at key program milestones and clearly communicate risk and reliability confidence to engineering leadership
- Develop physics-of-failure lifetime models and close the loop by performing failure root cause analysis and statistical analyses of test and field reliability data
- Partner with the SIE team and suppliers to verify component quality by overseeing outsourced testing and defining qualification and inspection requirements
- Collaborate across all teams to embed DfR principles into engineering decisions throughout the product cycle, including early architecture decisions, manufacturing process development, and cost-down projects
- Direct reliability experience with high voltage batteries, DC-DC converters, inverters, battery management systems, or PV solar products
- Hands-on experience designing, executing, and reporting complex electromechanical reliability tests (HTHE, PTCE, HTOE, HALT, vibration, corrosion)
- Experience with PCBA failure analysis tools such as SEM and X-ray
- Experience using DOEs, accelerated life testing, and field failure data to develop physics-based models for design margin analysis and lifetime failure prediction
Peak Energy develops and deploys sodium-ion battery systems for energy storage. It operates a large-scale manufacturing approach using a US-based gigafactory to produce sodium-ion batteries that are cheaper, safer, and more abundant than lithium-ion options. The product works by scaling the production of sodium-ion cells and modules to provide storage solutions for renewable energy producers, businesses, and homeowners, enabling reliable and cost-effective energy storage. Compared to competitors, Peak Energy differentiates itself with the first US-based sodium-ion gigafactory, a leadership team with experience from Tesla, Northvolt, SunPower, Fluence, and Enovix, and a focus on domestic supply chains to reduce price volatility and environmental impact. The company aims to set sodium-ion storage as the standard for the new era of renewable energy by delivering high-volume, cost-competitive storage at scale.
Company Size
51-200
Company Stage
Series A
Total Funding
$65M
Headquarters
Denver, Colorado
Founded
2023
Simplify's Take
What believers are saying
- 4.75 GWh contract with Jupiter Power for 2027-2030 deployments.
- 1.5 GWh offtake agreement with Energy Vault for AI data centers.
- $55M Series A led by Temasek's Xora funds 2026 US cell production.
What critics are saying
- Lithium-ion LFP prices erode $70/kWh cost advantage within 18 months.
- CATL and BYD undercut pricing with gigafactory scale before 2027.
- Chinese cell imports face tariffs, delaying US manufacturing ramp in 2026.
What makes Peak Energy unique
- Peak Energy deploys first US grid-scale NFPP sodium-ion battery system.
- Proprietary passive cooling eliminates active systems, cutting 85% failure causes.
- NFPP chemistry enables safe operation from -20°F to 113°F without degradation.
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Growth & Insights and Company News
6 month growth
↓ -3%1 year growth
↓ -1%2 year growth
↑ 15%Peak Energy has signed an agreement with RWE Americas to pilot its proprietary passively cooled sodium-ion battery storage system in Eastern Wisconsin. The deployment marks the first use of next-generation sodium-ion technology in the MISO grid region. Founded in 2023 by veterans from Tesla, Enovix and Apple, Peak Energy's system eliminates cooling requirements and reduces maintenance costs, lowering lifetime energy storage costs by approximately $70/kWh—roughly half the current battery system price. The technology operates safely across wide temperature ranges without performance degradation. RWE Americas, which operates approximately 13 GW of assets in the US, will test the technology at its Eastern Wisconsin laboratory. Peak Energy claims its system could reduce total storage costs by over 25% compared to conventional lithium-ion solutions.
Peak Energy has signed an agreement with RWE Americas to deploy the first sodium-ion grid storage battery on the Midcontinent Interconnected System Operator (MISO) network in Eastern Wisconsin. The pilot project will test Peak Energy's proprietary passively cooled sodium-ion battery technology. Founded in 2023 by veterans from Tesla, Enovix and Apple, Peak Energy claims its system reduces lifetime energy storage costs by approximately $70/kWh through eliminating routine maintenance, removing cooling systems and reducing capacity overbuild. The company's GS1.1 systems reportedly cut total storage costs by over 25% compared to conventional lithium-ion solutions. A 2025 Aurora Energy Research study found that installing 10 GWh of battery storage capacity in MISO over the next decade could reduce total system costs by $27 billion.
Energy Vault, Peak Energy partner to develop ai-dedicated energy storage architecture. Key Highlights * Energy Vault has partnered with Peak Energy to develop AI-focused energy storage solutions. * The collaboration includes a 1.5 GWh offtake agreement for U.S.-made sodium-ion batteries. * The solution targets AI Neoclouds and AI-first data centre operators. The partnership supports domestic sourcing to qualify for U.S. investment tax credits. Energy Vault Holdings Inc. has entered into a strategic partnership with Peak Energy to jointly develop energy storage systems tailored specifically for AI-driven data centre infrastructure. As part of the agreement, Energy Vault has secured an initial 1.5 gigawatt-hour (GWh) offtake of Peak Energy's U.S.-manufactured sodium-ion battery technology. The collaboration reflects growing pressure on traditional power infrastructure as artificial intelligence workloads drive unprecedented demand for reliable, scalable, and cost-effective energy solutions. Building storage for ai-first data centres. The companies plan to co-develop a next-generation energy storage architecture designed for AI Neoclouds and AI-first data centre operators. The system will integrate Peak Energy's sodium-ion battery technology with Energy Vault's proprietary system design and Vault OS software controls. This integrated solution will be deployed exclusively within Energy Vault's modular data centre offering, positioning the company to address the unique power-density, safety, and deployment challenges associated with AI infrastructure. "The rapid growth of AI is exposing fundamental limitations in conventional power infrastructure," said Marco Terruzzin, Chief Revenue Officer at Energy Vault. "This solution enables faster deployment, lower cost, and improved safety by combining Energy Vault's integration platform with Peak's sodium-ion technology." Securing domestic supply and tax credit eligibility. In addition to the technology collaboration, Energy Vault has signed a definitive supply agreement for 1.5 GWh of Peak Energy's sodium-ion battery systems. By locking in domestic supply, the company ensures its battery energy storage systems (BESS) and AI infrastructure projects can qualify for U.S. Domestic Content Investment Tax Credits (ITC). This move aligns with broader industry efforts to strengthen local supply chains while reducing exposure to international battery sourcing risks. Expanding global reach. Beyond the U.S. market, Energy Vault has also secured exclusive channel partner rights for Peak Energy's sodium-ion technology in Australia and Japan. The agreement positions Energy Vault to extend its AI-focused energy storage solutions into key international markets where demand for data centre capacity continues to accelerate. Peak Energy, founded in 2023, focuses on grid-scale sodium-ion battery energy storage systems designed as an alternative to lithium-based technologies, offering potential advantages in cost, safety, and material availability. February 12, 2026 February 11, 2026 February 7, 2026 February 6, 2026 January 29, 2026 January 28, 2026
Peak Energy secures landmark 4.75 GWh sodium-ion contract with Jupiter Power. U.S.-based energy storage developer Peak Energy announced a multi-year, phased agreement with Jupiter Power LLC, a major operator of utility-scale battery energy storage systems, to supply up to 4.75 gigawatt-hours (GWh) of sodium-ion battery technology. The supply agreement, scheduled for deployment between 2027 and 2030, underscores increasing confidence in the commercial viability of sodium-ion as an alternative to lithium-ion for large-scale grid applications. The deal's first phase involves the delivery of approximately 720 megawatt-hours (MWh) of storage capacity in 2027. According to the company, this initial delivery represents the largest single deployment of sodium-ion batteries announced globally to date. The overall contract, which includes an option for a further 4 GWh reservation spanning 2028 through 2030, could exceed $500 million in value. The transition toward non-lithium battery chemistries is being driven by the need for stable, cost-effective energy storage to manage rising grid demand, fueled in part by expanding data centers and Artificial Intelligence (AI) operations. Unlike lithium, sodium is abundant and widely accessible, offering the potential for improved supply chain security. Peak Energy claims its sodium-ion batteries offer several operational advantages, including lower operations and maintenance (O&M) costs and reduced degradation over the system's twenty-year lifespan compared to existing lithium-ion technology. The system utilizes a proprietary, passively cooled design that eliminates the need for active cooling, which the company states cuts auxiliary power consumption by up to ninety-seven percent. Landon Mossburg, chief executive officer and co-founder of Peak Energy, stated that the scale of the deployment "proves that sodium is ready for today" in grid-scale storage. Mike Geier, Chief Technology Officer at Jupiter Power, said the company was excited to support domestic battery manufacturing and called Peak Energy's innovation approach a "potential game changer for the industry." This agreement follows the recent commercial launch of Peak Energy's grid-scale sodium-ion system. While China currently leads global sodium-ion deployment, the partnership between Peak Energy and Jupiter Power signals a significant step forward in establishing and scaling a domestic sodium-ion battery supply chain within the United States.
Peak Energy, a Denver-based battery manufacturer, announced today the launch of the first grid-scale sodium-ion pyrophosphate (NFPP) battery system in the United States, which will be the largest of its kind in the world.