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Welcome to Extensible Energy

Headquartered in Oakland, California, Extensible Energy was founded in 2010 and is led by John Powers, an energy economist and software entrepreneur, and Ari Halberstadt, a solar software architect and engineer. 

Our mission: We believe that empowering every building with intelligent energy control software is essential for transitioning the world to a modern, clean energy grid.


Co-founder & CEO

Experienced entrepreneur; 25+ years of energy experience: utilities; energy consulting; economist, MA.


Chief Strategy Officer

Serial cleantech executive and investor with successful ventures in software, wind energy, solar energy, and finance platforms. BA -Public Policy, and MBA.


Director of Building Technologies

10 years HVAC Design & Engineering experience including: modeling and controls engineer, Model Predictive Control, Mechanical Engineering PhD


Software Engineer

Fullstack developer with over 15 years of experience.


Energy Analyst

Recent Oregon State University graduate with experience in novel water desalination research and energy analysis. BS in Engineering, Minor in Business, EIT.


Field Operations Manager

14+ years experience introducing cutting edge distributed technology to the market. BA.


Senior Software Developer

10+ years in software engineering.


Chief Commercial Officer

Two decades leading product and business development from high tech (HP) to clean tech (PV Powered, AE, Chint Power).   Founder, investor, & business builder.  BS & MS in Engineering.


Director of Software Engineering

15 years software architecture experience: software architect, Agile trained, NRG Home Solar software engineering, energy resources engineer, MS.


Data Scientist

Efforts include Antarctic neutrino experiments, gamma-ray-burst observatories in the US, a Kuiper belt observatory in Taiwan, and HIV experiments in San Francisco.


Marketing Associate

Recent UC Berkeley graduate passionate about leveraging marketing to accelerate our transition to renewable energy. Several years of environmental advocacy & research experience.


Energy Analyst

Recent San Jose State University graduate with a BS in Environmental Studies/ Energy and a minor in Green Engineering.

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Senior Software Engineer

15+ years in building energy management industry with an electrical and mechanical focused background. 



10 years clean energy product and finance experience: solar+storage product development, venture capital, investment banking, MS.


Our Values


When it comes to load flexibility and demand charge management challenges for solar and storage, we will always  be improving our solutions.


Our software and services are always easy to install and nearly invisible. Customers should only notice us when they see how we’ve reduced their utility bills.


Our software is adaptable in real-time, and so are we. We’ll happily adapt to new technology, rates, markets, policies, and opportunities.


You can trust us to deliver on our promises. Whatever we do, we’ll always make it right.


We are energetic, always moving forward, always improving, always looking for new opportunities to deliver more.


Data is good. Harnessing and using data improves our products, our business, and our vision for transitioning the world to 100% clean energy.

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