Photo: Flickr/DavidPaulOhmer They did it last year, and they’re doing it again: The organizers of Intersolar North America are offering free registration to visitors until April 12. For those not familiar with Intersolar, it’s perhaps the second most prestigious international solar conference in the U.S. Solar Power International gets top prestige honors for U.S. solar conferences, but unlike Solar Power International, Intersolar is very predictable. It stays in one place and time. That is,...

