Renewables can take over on or before 2030, if entire world does it the way China did. Slower progress towards it might take one more decade for renewables to take over. The most common form would be solar because it is the primary form of energy recieved by earth. The others forms are just solar energy stored by earth, which too can be used day in day out, like ocean and wind energy, but they just can't provide as much as the sun can.