Electrical power unit

The design is the visual features of the ELECTRICAL POWER UNIT shown in the drawings, whether those features are features of one of shape, configuration, ornament or pattern or are a combination of any of these features. Drawings of the design are included, as follows: FIG. 1 is a front perspective view of an ELECTRICAL POWER UNIT showing our new design in an open-cover configuration, viewed from above and to the right; FIG. 2 is a rear perspective view thereof, viewed from below and to the left; FIG. 3 is a front elevation view thereof; FIG. 4 is a rear elevation view thereof; FIG. 5 is a right side elevation view thereof; FIG. 6 is a left side elevation view thereof; FIG. 7 is a top plan view thereof; and FIG. 8 is a bottom plan view thereof. In the drawings, the broken lines depict unclaimed subject matter only and form no part of the claimed design.