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Our Services

KO2 Consulting provides global strategic energy advisory services for large public corporations, non-profit organizations and private companies to achieve their organizational energy performance targets, operationalize their climate change initiatives and integrate energy strategy to overarching sustainability goals.


Strategic advising services to help you design your energy and sustainability programs


Assistance with carbon assessments, target setting, and data collection to measure results and impact

Implementation Support

Services to support net zero and high energy performance building design and construction

The Sectors We Are In

KO2 offers energy and sustainability services to clients in multiple sectors. Below is a selection of work by sector.

Transportation and Aviation

Real Estate

Real Estate


Government and Education

Education and Government

Arts and Film

Film and Arts

Our team


Ozgem Ornektekin, LEED AP BD+C

President and Founder

Ozgem Ornektekin is the President and Founder of KO2 Consulting, providing strategic sustainability and energy planning, carbon footprint assessment, implementation and management services for large public and private organizations. She is responsible for providing visionary leadership, strategy and direction to integrate sustainability and energy conservation principals into the operational functions for many of New York City’s leading institutions.

Ellen Zielinski

Ellen Zielinski

Vice President of Strategy Development

Ellen Zielinski is the Vice President of Strategy Development at KO2 Consulting with expertise in the development and implementation of energy and sustainability programming for large public organizations.

Kerem Yuksel, LEED GA

Sustainability Manager

Kerem Yuksel is a Sustainability Manager at KO2 Consulting. Kerem’s expertise is in risk analysis, carbon emissions calculations, green infrastructure research, and biosolid characterization in New York City. Kerem is a skilled data analyst and has completed carbon inventories, carbon calculations and science-based targets for numerous Fortune 500 companies.

We offer Training

KO2 can deliver training services through a combination of existing industry training programs, full day or half day training seminars and individual coaching.

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Our Address

1325 Avenue of the Americas, NYC