From there, Tesla held a grandiose event in Los Angeles to show off solar roofing tiles. The unveiling differed from the unveiling of the Powerwall and Powerpack a year earlier in that, with the Powerwall announcement, Tesla had been building stationary batteries for months before they decided to make stationary batteries an official business segment. Tesla's announcement of the solar tiles was much more vague. In a press conference later that evening, Musk essentially said the solar tiles were DOA unless the SolarCity merger was approved. He claimed any looser collaboration with SolarCity would be unwieldy.