Mohammed Sobhi looked out across 800 square meters of solar panels absorbing sun power to air-condition an Israeli office building. He envisioned a similar system producing electricity in the desert south of Cairo.Sobhi, a senior official in the Egyptian Ministry of Electricity and Energy, joined energy officials from the United States and Japan on Wednesday as Israel-based Solel Solar Systems switched on the power source it says will in the coming days replace 70 percent of its own conventional electricity needs.