In Creating More Effective Graphs, I show the following example where grid lines are used for visual reference. The grids help to compare the relative locations on the different panels.

The problem with renewable power is timing. Solar power peaks in the early afternoon, when the sun is high overhead. Wind power peaks at night, at least in California. Juggling these resources ...

Grid parity for solar PV now exists in 102 countries. ... Here’s an interesting graph used by Suntech’s Stuart ... He says that solar PV at a utility level will also challenge fossil ...