Here's an interview with Richard Hatfield:
http://gooddaysacramento.cbslocal.com/video/8043414-solar-motorcycle/He mentions that the (presumably 12 kWh) pack is good for 20 miles @ 215 mph, 35 miles on a road course, or 100+ miles on the freeway.
215 mph: 12 kWh / 20 miles = 600 Wh/mile @ 129 kW average
road course: 12 kWh / 35 miles = 340 Wh/mile @ 70-100 mph average or 24-34 kW average
freeway: 12 kWh / 100 miles = 120 Wh/mile @ 70 mph (presumably), 8.4 kW average