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Energy Engineer Jobs in O Fallon, IL (NOW HIRING)

CDG Engineers Inc

Electrical Engineer

Saint Louis, MO · On-site

Renewable Energy - Solar, BESS, Electrification * Power Engineering with a focus on heavy industrial systems * System Relaying * Working ability with AutoCAD, Revit, or similar design tools preferred.

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Showing results 21-40

All JobsEnergy Engineer JobsEnergy Engineer Jobs in O'Fallon, IL

Energy Engineer information

See O Fallon, IL salary details

$49.9K

$91.5K

$129.7K

How much do energy engineer jobs pay per year?

As of Aug 23, 2026, the average yearly pay for energy engineer in O'Fallon, IL is $91,474.00, according to ZipRecruiter salary data. Most workers in this role earn between $73,700.00 and $105,900.00 per year, depending on experience, location, and employer.

What does an energy engineer do?

As an energy engineer, you design sustainable projects and find ways to cut energy costs while increasing efficiency either as an employee of an organization or as a consultant. Your job duties include analyzing data on energy use, providing advice about green engineering methods, creating energy models, and designing plans for green building or remodeling projects. An engineering focus in specialties like air quality, energy procurement, electrical systems, green architecture, solar power, or heating, ventilation, and air conditioning (HVAC) systems can contribute to the overall energy efficiency of your organization.

What are the key skills and qualifications needed to thrive as an energy engineer, and why are they important?

To thrive as an Energy Engineer, you need in-depth knowledge of energy systems, thermodynamics, and environmental regulations, typically supported by a degree in engineering or a related field. Familiarity with energy modeling software (such as RETScreen or EnergyPlus), building management systems, and professional certifications like Certified Energy Manager (CEM) are highly valuable. Strong analytical thinking, problem-solving abilities, and effective communication skills set top performers apart. These competencies are crucial for designing efficient energy solutions, ensuring regulatory compliance, and collaborating with multidisciplinary teams to achieve sustainability goals.

What are some common challenges energy engineers face when implementing energy efficiency projects?

Energy Engineers often encounter challenges such as budget constraints, balancing energy savings with occupant comfort, and integrating new technologies into existing building systems. Collaboration with facility managers, contractors, and other engineers is essential to overcome these obstacles and ensure projects meet regulatory standards and client goals. Additionally, securing stakeholder buy-in and accurately measuring the impact of efficiency upgrades can require strong communication and data analysis skills.

What is the difference between Energy Engineer vs Mechanical Engineer?

AspectEnergy EngineerMechanical Engineer
Required CredentialsBachelor's in engineering, certifications like LEED or Certified Energy ManagerBachelor's in mechanical engineering, Professional Engineer (PE) license often preferred
Work EnvironmentDesigning energy systems, analyzing energy consumption, working on sustainability projectsDesigning mechanical systems, HVAC, manufacturing equipment, and product development
Employer & Industry UsageUtilities, renewable energy firms, consulting companies, government agenciesManufacturing, aerospace, automotive, HVAC companies

Energy Engineers focus on optimizing energy use and sustainability, often working on renewable projects and energy efficiency. Mechanical Engineers have a broader scope, designing mechanical systems across various industries. Both roles require engineering degrees, but their daily tasks and industry focus differ significantly.

More about Energy Engineer jobs

What cities near O'Fallon, IL are hiring for Energy Engineer jobs?

Cities near O'Fallon, IL with the most Energy Engineer job openings:

Energy Engineer jobs near you
Infographic showing various Energy Engineer job openings in O'Fallon, IL as of August 2026, with employment types broken down into 89% Full Time, and 11% Part Time. Highlights an 83% In-person, 6% Hybrid, and 11% Remote job distribution, with an average salary of $91,474 per year, or $44 per hour.

Engineer Operational Technology

Peabody Energy

Saint Louis, MO • Hybrid

$67K - $82K/yr

Full-time

Posted 3 days ago

New

Peabody Energy rating

8.6

Company rating: 8.6 out of 10

Based on 30 frontline employees who took The Breakroom Quiz

5th of 41 rated mining

Job description

About the role:

We are currently seeking an Operations Technology Engineer. The OT Engineer will assume responsibilities for development, configuration, systems administration and support for existing and future OT technologies. This includes technologies specific to the mining industry such as Ampla MES, fleet management, dragline operations, historians, machine health, etc.

Duties will include:

  • Work with the Operations to identify, define, measure, analyze, implement and control Operational Technology projects
  • Define functional requirements through client interviews, documentation analysis and Work Flow Process Mapping
  • Perform high level technical analysis activities delivering detailed design specifications based on functional requirements
  • Provide programming and configuration support for OT applications including development of analytics, visualisations and bespoke software where applicable
  • Develop/maintain a broad range of project and associated documentation, including designs and test plans

The Lifestyle:

This position is a full-time role, working from our corporate headquarters in St Louis, MO or remotely from states listed: IL, IN, CO, NM, WY, AL FL, MI, PA, VA, NE, NC. Peabody offers flexible work policies, including hybrid office / home working arrangements. The salary range for this role is $67,000 - $82,000. 

About you:

Qualifications

  • Bachelor's degree from an accredited university in Process Control / Chemical / Computer /Software / Mechanical / Electrical Engineering, or a related technical background
  • At least 1 year of experience in industrial technology fields in one or more of the following industries: Manufacturing, Mining, Oil & Gas and Refining 

Experience

  • Able to quickly grasp new technologies eg Cloud Technologies
  • Motivated self-starter that can work independently with minimal supervision as well as in a global team environment
  • Exceptional attention to detail & capability to develop detailed processes
  • Experience with industrial control system technology such as PLCs, HMIs, DCSs, and OPC
  • Experience with programming languages - specifically Python, SQL, C#
  • Experience with visualisation tools - specifically SSRS, Power BI
  • Previous experience with MES systems, relational databases and data historians
  • Sound practical knowledge of information management system projects and/or services
  • Strong understanding of relevant mining terminology
  • Must be willing and able to travel to sites

Physical requirements:

  • Must have the ability to perform office-related tasks which may include prolonged sitting or standing
  • Must have the ability to move from place to place within an office environment
  • Must be able to use a computer
  • Must have the ability to communicate effectively
  • Some positions may require occasional repetitive motion or movements of the wrists, hands, and/or fingers

This job description is not intended to be all-inclusive; an employee will also perform other related job responsibilities as assigned by immediate supervisor and other management as required. Peabody reserves the right to revise job descriptions or change and/or modify job responsibilities, functions and requirements as the need arises. This job description does not constitute a written or implied contract of employment.

About Peabody:

Peabody is a leading coal producer, providing essential products for the production of affordable, reliable energy & steel. We employ approximately 5,300 people across our operations in the United States & Australia, serving customers in 18+ countries.

Our commitment to sustainability underpins everything we do and shapes our strategy for the future.

People are at the core of Peabody's ability to deliver business results & serve our communities & we offer an inclusive work environment that engages, recognizes, and develops it employees. We strive to create a safe and healthy work culture where all employees are treated with fairness and respect are supported and engaged.

Take the first step toward a rewarding career working with us at: visit Peabody - US Jobs (peabodyenergy.com)

EEO Disclaimer: Peabody Energy is an Equal Opportunity Employer.

Apply to Peabody today #buildingbrighterfutures

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