Energy calculation methods: A synopsis of our engineering methods can be found here. A comprehensive summary of HES calculation methodology, data, and infrastructure is available here.
Graphing: We use a licensed Google Chart API to generate the bar charts on the Compare pages. API users need to either independently license and implement that API, or select another graphing function of their choosing.
Google map not included in APIs: However, users are welcome to open the HES version in conjunction with their own sites. That link is: http://hes.lbl.gov/consumer/carbon-map
Release notes: A summary of HES release notes are here.