Vermont-based utility, Green Mountain Power, has achieved remarkable success with its Tesla-based Virtual Power Plant (VPP) initiative. The VPP, comprising 4,800 Powerwall units with a collective capacity of 27 megawatts, has not only saved residents $3 million in peak electricity costs but has also played a crucial role in maintaining power supply during severe winter storms.
Since 2015, Green Mountain Power has been at the forefront of using small solar panels and home energy storage to enhance grid performance. The company subsidized customers who installed battery backup systems in their homes, leveraging these batteries to reduce grid expenses for all customers during peak demand periods. Over time, the VPP has expanded significantly, growing to its current size of 4,800 batteries.
The state of Vermont has experienced a series of weather-related disasters, including winter storms, floods, and heatwaves. Consequently, the demand for home batteries surged as more customers sought resilient power solutions. Government regulators imposed annual caps on program enrollment, resulting in a growing waitlist for Tesla Powerwalls that stretches until 2026.
However, a significant development occurred on August 18 when the Vermont Public Utility Commission lifted the annual cap, allowing Green Mountain Power to meet the rising demand from customers without restrictions for the next three years.
Customers opting for Powerwall units pay the utility $55 per month with no deposit, and payments cease after a decade. Afterward, households can use the system for free until it reaches the end of its life cycle, at which point the utility handles its recycling. Alternatively, customers who purchase and install their own battery systems receive substantial incentives, receiving up to $10,500 to offset their costs.
The VPP’s impact extends beyond cost savings for individual users. By using Tesla Powerwalls strategically, Green Mountain Power reduces overall electricity demand during peak hours, resulting in significant savings for all customers. In recent years, the VPP has successfully lowered annual peak costs by an impressive $3 million.
This remarkable success story underscores the potential of virtual power plants and home battery systems in bolstering grid resilience, reducing costs, and advancing sustainability goals. Green Mountain Power’s innovative approach demonstrates how clean energy technologies can benefit both utilities and consumers, even in the face of adverse weather conditions.