$5 does not make sense, and there must be some qualifer on that we're missing.

Napkin math:

(27 minute flight) * (25000 lbm TOGW) * (Earth gravity) / (~10 average L/D) * (160 KTAS average) / (70% propulsive efficiency) / (97% coulombic efficiency) * ($50/MWh) = $30

(Add residual kinetic energy upon landing too)

Side note: Heart also has a weight issue here they'll need to overcome if they want to certify under FAR Part 23 (as their 19-pax spec implies); TOGW limit for that is 19,000 lbm.

It's a 30-pax (32-seat), Part 25.