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Energy Systems Engineer Jobs in Illinois (NOW HIRING)

Mechanical Systems Engineer

Shannon, IL · On-site

$122K - $154K/yr

We have been the leader in clean energy production for more than a decade, and we are cultivating a ... The Mechanical Systems Engineer position is based out of our Byron Clean Energy facility in Byron ...

Mechanical Systems Engineer

Byron, IL · On-site

$122K - $154K/yr

We have been the leader in clean energy production for more than a decade, and we are cultivating a ... The Mechanical Systems Engineer position is based out of our Byron Clean Energy facility in Byron ...

Mechanical Systems Engineer

Polo, IL · On-site

$87K - $154K/yr

We have been the leader in clean energy production for more than a decade, and we are cultivating a ... The Mechanical Systems Engineer position is based out of our Byron Clean Energy facility in Byron ...

Mechanical Systems Engineer

Chana, IL · On-site

$87K - $154K/yr

We have been the leader in clean energy production for more than a decade, and we are cultivating a ... The Mechanical Systems Engineer position is based out of our Byron Clean Energy facility in Byron ...

Mechanical Systems Engineer

Polo, IL · On-site

$122K - $154K/yr

We have been the leader in clean energy production for more than a decade, and we are cultivating a ... The Mechanical Systems Engineer position is based out of our Byron Clean Energy facility in Byron ...

Mechanical Systems Engineer

Holcomb, IL · On-site

$122K - $154K/yr

We have been the leader in clean energy production for more than a decade, and we are cultivating a ... The Mechanical Systems Engineer position is based out of our Byron Clean Energy facility in Byron ...

Mechanical Systems Engineer

Polo, IL · On-site

$122K - $154K/yr

We have been the leader in clean energy production for more than a decade, and we are cultivating a ... The Mechanical Systems Engineer position is based out of our Byron Clean Energy facility in Byron ...

Mechanical Systems Engineer

Shannon, IL · On-site

$122K - $154K/yr

We have been the leader in clean energy production for more than a decade, and we are cultivating a ... The Mechanical Systems Engineer position is based out of our Byron Clean Energy facility in Byron ...

Mechanical Systems Engineer

Chana, IL · On-site

$122K - $154K/yr

We have been the leader in clean energy production for more than a decade, and we are cultivating a ... The Mechanical Systems Engineer position is based out of our Byron Clean Energy facility in Byron ...

Showing results 21-40

Energy Systems Engineer information

See Illinois salary details

$51.8K

$123.3K

$161.8K

How much do energy systems engineer jobs pay per year?

As of Sep 8, 2026, the average yearly pay for energy systems engineer in Illinois is $123,274.00, according to ZipRecruiter salary data. Most workers in this role earn between $95,000.00 and $152,100.00 per year, depending on experience, location, and employer.

What does an energy systems engineer do?

An Energy Systems Engineer designs, analyzes, and optimizes energy generation, distribution, and storage systems to improve efficiency and sustainability. They work with renewable energy sources, power grids, and energy management systems to develop innovative solutions for reducing energy consumption and costs. Their role often involves conducting simulations, assessing environmental impacts, and integrating new technologies to enhance system performance. Depending on the industry, they may work in utilities, manufacturing, or research to support the transition to cleaner and more efficient energy solutions.

What are the key skills and qualifications needed to thrive as an energy systems engineer?

To thrive as an Energy Systems Engineer, you need a strong background in engineering principles, energy systems modeling, and renewable energy technologies, typically supported by a degree in electrical, mechanical, or energy engineering. Familiarity with simulation tools like MATLAB/Simulink, energy management systems (EMS), and relevant certifications such as Professional Engineer (PE) licensure is highly beneficial. Strong problem-solving abilities, project management skills, and effective communication are critical soft skills in this field. These competencies enable professionals to design, optimize, and implement efficient energy solutions that meet both technical requirements and client needs.

What are some typical projects or responsibilities that an energy systems engineer might handle on a daily basis?

As an Energy Systems Engineer, you may work on projects involving the design, analysis, and optimization of power generation or distribution systems, implementation of renewable energy solutions, or integration of energy storage. Daily tasks often include conducting system modeling and simulations, preparing technical reports, collaborating with multidisciplinary teams, and liaising with clients or stakeholders to align project goals. You may also be responsible for monitoring system performance, troubleshooting issues, and staying updated with evolving technologies and regulations in the energy sector. This variety ensures a dynamic work environment and valuable opportunities to grow your expertise in sustainable energy solutions.

Infographic showing various Energy Systems Engineer job openings in Illinois as of September 2026, with employment types broken down into 1% As Needed, 79% Full Time, 15% Part Time, 2% Contract, and 3% Nights. Highlights an 86% Physical, 2% Hybrid, and 12% Remote job distribution, with an average salary of $123,274 per year, or $59.3 per hour.

Mechanical Systems Engineer

Constellation Energy

Kingston, IL • On-site

$122K - $154K/yr

Other

Medical, Dental, Vision, Life, Retirement, PTO

Re-posted yesterday


Constellation Energy rating

8.6

Company rating: 8.6 out of 10

Based on 101 frontline employees who took The Breakroom Quiz

12th of 87 rated oil and gas companies


Job description

Who We Are

As the largest private-sector power producer in the world and the nation's largest producer of clean and reliable energy, Constellation is focused on our purpose: lighting the way to a brilliant tomorrow for all. We have been the leader in clean energy production for more than a decade, and we are cultivating a workplace where our employees can grow, thrive, and contribute. Now integrated with Calpine, our portfolio includes 55 gigawatts of capacity from nuclear, natural gas, geothermal, hydro, wind and solar facilities, with the generating capacity to power the equivalent of 27 million homes.

The Mechanical Systems Engineer position is based out of our Byron Clean Energy facility in Byron, IL.


Our culture and employee experience make it clear: We are powered by passion and purpose. Together, we're creating healthier communities and a cleaner planet, and our people are the driving force behind our success. At Constellation, you can build a fulfilling career with opportunities to learn, grow and make an impact. By doing our best work and meeting new challenges, we can accomplish great things. Join us in meeting the country's energy needs today and tomorrow.

Total Rewards

Constellation offers an extensive selection of benefits and rewards to help our employees thrive professionally and personally. We provide competitive compensation and a wide-range of benefits that support both employees and their families, helping them prepare for the future. In addition to highly competitive salaries, eligible employees are offered a bonus program, 401(k) with company match, employee stock purchase program comprehensive medical, dental and vision benefits, including robust wellbeing programs disability and life insurance benefits paid time off for vacation, holidays, and sick days and much more.

*****************This Engineering role can be filled at Entry level,  Mid-level or Senior Engineer level. Please see minimum qualifications list below for each level*********************************** 

Entry Level - $87,000

Mid Level - $92,700-$114,000 

Sr Level - $122,400-$154,000 

Ranges are per year based on experience, along with a comprehensive benefits package that includes bonus and 401K 

Primary Purpose of Position

Responsible for performing engineering and technical tasks, under general supervision, in support of nuclear plant operations.

Primary Duties and Accountabilities

  • Perform engineering and technical tasks as assigned by supervision applying general engineering principles
  • Assure all engineering products prepared are in accordance with applicable safety analyses, industry codes, engineering specifications and all regulatory requirements.
  • Participate in the development and implementation of effective processes and techniques at appropriate levels of detail and in compliance with established policies and procedures.
  • Recommend format and methodology improvements to standard processes and procedures.
  • Perform other job assignments and duties as directed by management or pursuant to company policy, including but not limited to emergency response, departmental coverage, call outs, and support of outage activities in positions outside the department.

MINIMUM QUALIFICATIONS for Entry Level E01 Engineer &ndash New Graduate 

  • B.S  in Engineering (Chemical, Civil/Structural, Electrical, Industrial, Mechanical or Nuclear) 
  • Maintain minimum access requirements or unescorted access requirements, as applicable, and favorable medical examination and/or testing in accordance with position duties

MINIMUM QUALIFICATIONS for Mid-level E02 Engineer

  • B.S. in Engineering, a minimum 2 years Nuclear experience or related engineering experience
  • Must meet additional requirements as outlined in ANSI/ANS-3.1-2014 Standard, "Selection, Qualification, and Training of Personnel for Nuclear Power Plants"
  • Maintain minimum access requirements or unescorted access requirements, as applicable, and favorable medical examination and/or testing in accordance with position duties

MINIMUM QUALIFICATIONS for Senior E03 Engineer

  • B.S. in Engineering, a minimum 5 years Nuclear experience or related engineering experience
  • Must meet additional requirements as outlined in ANSI/ANS-3.1-2014 Standard, "Selection, Qualification, and Training of Personnel for Nuclear Power Plants"
  • Maintain minimum access requirements or unescorted access requirements, as applicable, and favorable medical examination and/or testing in accordance with position duties

Preferred Qualifications

  • BS Mechanical, Civil, Industrial or Chemical Engineering
  • Engineer in Training Certification
  • Good grasp of techniques and a good understanding of the fundamental functions performed by the group. As responsibility increases within the organization
  • Experience with raw water systems
  • Nuclear power plant experience

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