A year after voters approved a $100 million bond to boost solar power in San Francisco, planning is well underway to position the city as the country’s largest municipal generator of solar power and other renewable energies. Within five years, San Francisco hopes to add 10 megawatts of solar power to the electricity grid. In the long term, the city is determined to increase solar generation an additional 40 megawatts — enough to meet about 5 percent of the city’s peak electricity needs. “It is clear to us that the leadership for promoting renewable energy is not going to come from the White House or Congress,” said David Hochschild, a leader in passage of the renewable energy ballot measure. “The action really is at the local level.”