Conventional hydraulic power on most North American land rigs still arrives on the back of a diesel truck. That engine may idle for twelve or more hours a day, burning fuel, vibrating the rig floor, and demanding regular maintenance. Electric hydraulic power units (eHPUs) offer a cleaner, quieter, and far more reliable alternative. By tapping the rig’s existing electrical grid, an eHPU removes a diesel engine, a truck, and a long list of hidden costs.