FIG. 1 is an upper front isometric view of our new ornamental design for a solar power plant in accordance with the present disclosure;
FIG. 2 is an upper right isometric view thereof;
FIG. 3 is a front side elevational view thereof;
FIG. 4 is a back side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a left side elevational view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof;
FIG. 7 is a front upper left isometric view thereof;
FIG. 8 is a front upper right isometric view thereof;
FIG. 9 is a rear lower left isometric view thereof;
FIG. 10 is a rear lower right isometric view thereof;
FIG. 11 is a front lower left isometric view thereof; and,
FIG. 12 is a front lower right isometric view thereof.
Broken lines included in the drawings show portions of the solar power plant that form no part of the claimed design.