Fat Spaniel Technologies has an online monitoring and reporting service for renewable energy systems.
This is really cool. They have a huge list of sites that are monitored, and you can expand each one to get more details.
Each site listed has a simple and detail view.
The Simple interface shows how many watts are being generated currently, how many kWh have been produced total, and the amount of CO2 that was not released into the atmosphere as a result of home energy production. On this page ....

Do It Yourself Solar