The sharp-looking electric Sierra debuted this week with a potent 754-hp electric 4WD. The impressive Denali Edition 1 gets rear wheel-steering, crab-walking athleticism and MidGate-driven expandable bed versatility to meet the needs of all kinds of pickup drivers. At over US$100,000, the first edition prices into Hummer territory, but the electric Sierra family will eventually grow to include a base model priced under half that.