ES is a terrific resource. Rapid response with abundant and clear technical details from 6 or 7 highly rated companies selling good equipment, a very educational website with lots of readable content, and rapid and easy access to authoritative, unbiased, and personal responses from knowledgeable advisors who also follow up with the individual companies if needed. I am pretty good with scoping and planning home construction but could not have navigated the solar process on the short timescale demanded by California's NEM2 expiration without ES (not there yet, but it's all with the contractor now). I have recommended it to several other people and will continue to do so.