April 20 : Tesla's solar and energy business is likely to outshine the EV maker's challenged core business when it reports quarterly results this week, a sign of resilience as Tesla progresses slowly in its turn to robots and self-driving technology. CEO Elon Musk's plans to build new assembly lines and produce robots are expected to cost $20 billion this year and drive Tesla to its first quarter of negative cash flow in two years. Tesla's vehicle profitability has shrunk from its peaks, while