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2026 Summer Mechanical Engineering Intern

fourth-power· Engineering
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📍 Middleton, MAIntern

About this role

2026 Summer Mechanical Engineering Intern

Fourth Power is developing and commercializing the lowest cost energy storage technology on the market to enable the utility grid to operate 24/7/365 on renewable energy. Our batteries store heat in low-cost carbon blocks at up to 2400 degrees Celsius – half the temperature of the sun. The batteries then convert this heat back to electricity using thermophotovoltaics (TPV) on demand.

Fourth Power has a culture of teamwork, continuous innovation based on first principles, andrelentlessness in tackling challenging problems. Fourth Power is looking for highly skilled and motivated individuals who share our passion for mitigating climate change.

Job Description

We are seeking a Summer Intern to join Fourth Power’s Engineering team to support testing and design optimization of key graphite components that comprise our high temperature energy storage system. If you are a student studying mechanical engineering, who enjoys hands-on work and are comfortable in a lab/test environment, we encourage you to apply!

Job Type: Internship

Job Location: Middleton, MA

Your Role

  • Assist with experimental setup, execution, and optimization

  • Support joint design and mechanical testing apparatuses

Qualifications

  • Basic experience with CAD (SolidWorks or similar)

  • Familiarity with Microsoft Office (PowerPoint/Excel)

  • Background in heat transfer, thermodynamics, or thermochemical systems

  • Experience with or interest in vacuum and/or pressurized systems

  • Exposure to simulation tools (e.g., ANSYS)

  • Excellent organizational skills, attention to detail, and ability to work independently in a fast-paced environment.

  • Strong communication skills to effectively collaborate with fellow engineers and technicians.

Frequently Asked Questions

Is the salary disclosed for the 2026 Summer Mechanical Engineering Intern position at fourth-power?
The salary for this 2026 Summer Mechanical Engineering Intern role at fourth-power is not publicly listed. Click "Apply Now" to learn more about the compensation package on their official careers page.
Where is the 2026 Summer Mechanical Engineering Intern position at fourth-power located?
This 2026 Summer Mechanical Engineering Intern role at fourth-power is based in Middleton, MA. The position is listed as on-site or hybrid. Check the full job description or apply directly to confirm the work arrangement.
Is the 2026 Summer Mechanical Engineering Intern role at fourth-power full-time or part-time?
This is listed as a Intern position. It is posted as a 2026 Summer Mechanical Engineering Intern role in the Engineering department at fourth-power.
Which team or department does the 2026 Summer Mechanical Engineering Intern at fourth-power belong to?
This 2026 Summer Mechanical Engineering Intern position is part of the Engineering department at fourth-power. See the full job description for more information about the team structure and responsibilities.
How do I apply for the 2026 Summer Mechanical Engineering Intern position at fourth-power?
Click the "Apply Now" button on this page. You will be redirected to fourth-power's official application portal hosted on ashby where you can submit your application directly.
When was the 2026 Summer Mechanical Engineering Intern job at fourth-power posted?
This 2026 Summer Mechanical Engineering Intern position at fourth-power was posted on Apr 9, 2026. Apply as soon as possible — early applications are often reviewed first.
2026 Summer Mechanical Engineering Intern
fourth-power
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You'll be redirected to fourth-power's official application page on Ashby ATS.