To follow up on last night’s post about wind energy parity and Buffett’s big investment here’s Think Progress’s 13 Major Clean Energy Breakthroughs of 2013.

Wind, solar, ocean and batteries all made big advances in 2013. Looking forward to 2014. The marriage of SolarCity and Tesla alone is something to be excited about.

SolarCity and Tesla are teaming up to bring a combination of solar power and storage to commercial buildings in California, Connecticut and Massachusetts.

The system is called DemandLogic, and it involves batteries produced by Tesla Motors — “about the size of a small refrigerator” — combined with a solar array and software that communicates with the wider grid, responding to changes in rates and electricity demand and balancing those with what the solar array and the battery can provide.