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Welcome to

What is

A Tool For Analysts

A large and growing community of energy analysts in universities, industry, government, and NGOs are involved in quantitative projections relating to energy. They are interested in evaluating the economic and environmental effects of new energy technologies, business plans, R&D programs, and public policies. More generally, they seek to illuminate possible paths to a more sustainable World.

A Tool For All of Us

More and more everyday people and businesses are also becoming more energy-conscious, as tough economic times and broader questions of sustainability encourage us to think more critically about energy.

Numbers With Transparency

To answer questions effectively, all of these folks need estimates of a wide variety of quantities — not just current numbers, but credible projections into the future, preferably with some assessment of their uncertainty. It can be a lot of work to find such estimates and determine which are credible. is an online resource designed for people to share, compare and discuss such numbers. is similar to Wikipedia in that anyone can browse and contribute content. Unlike Wikipedia, contributing users are publicly identified to give credit where due, and avoid anonymous destructive contributions. Contributors are encouraged to rate and review each other’s estimates, but cannot edit or delete contributions by others (unless they are granted explicit permission).

A Community of the Energy-Minded

Perhaps most importantly, is a place that aims to foster collaboration and dialogue. If we work together to ensure that good information is readily available for everyone, then we have a much better chance of moving toward a sensible energy future.

Graph as You Go!

Use the Graphing tab to investigate trends and visually browse through MegaJoule's highly structured data. Below is a bar graph that shows several estimates of the levelized cost of electricity from utility-scale solar photovoltaics. The light blue bars represent low and high uncertainty values.


Still getting your bearings? Take a quick tour!

Want to jump right in and explore? Go to Estimates or Graphing to look through the data (and maybe add some of your own)!

To download a more in-depth introduction to, click here

So, how can I help?

Want to help us make a more democratic and user-friendly tool? The easiest way is to become a beta user! Signing up is really easy, just click Sign Up and fill in some basic information. Once you are registered, you will be able to add, rate and comment on Estimates, Sources, and more.

If you have any suggestions for things we could add, change or otherwise do differently, or if you have any problems, please email us at