The energy management system has the potential to help ensure continuity of supply during natural disasters. It could also make electricity from renewable sources, like the wind or sun, more viable by storing power to be used during periods of high demand. Nissan is using Nissan LEAF electric vehicles and the “LEAF to Home” power supply system in the field tests.
The tests are being conducted by ENERES Co., Ltd.. Nissan is using Nissan LEAF EVs paired with the LEAF to Home power supply system for demand response testing at several of its sales outlets run by subsidiary Kanagawa Nissan Co., Ltd. to assess the effectiveness of EV batteries when used for energy management.
Demand response is a strategy to make power grids more efficient by modifying consumers’ power consumption in consideration of available energy supply. Since the Great East Japan Earthquake in March 2011 the supply and demand of electricity during peak use hours in Japan has drawn attention. Under the demand response scheme, power companies request aggregators to use energy conservation measures, and they are compensated for the electricity that they save.
Usually when energy-saving is requested consumers may respond by moderating their use of air conditioning and lighting. However, by using the storage capacity of electric vehicles and Vehicle to Home (V2H) systems, consumers can reduce their use of power at peak times without turning off lights and appliances. This is particularly useful in commercial establishments where it is difficult to turn power off to save electricity.
The demand response scheme involves assessing the usefulness of energy-saving measures using V2H systems during peak-use periods and analyzing the impact of monetary incentives on business. For example, the testing involves a Nissan LEAF and LEAF to Home system which is connected to power a Nissan dealer’s lighting system during regular business hours using stored battery energy. This reduces electricity demand on the power grid. The aggregator is then compensated for the equivalent of the total amount of electricity that is saved. Two or three tests per month will be conducted on designated days for three hours’ each time sometime between 8:00 a.m. to 8:00 p.m. from October 2014 through January 2015.
Effective use of renewable energy and improvements in the efficiency of power generation facilities will enable better energy management in the future and help reduce environmental impact. Field tests using EVs’ high-capacity batteries that are being conducted globally are proving their effectiveness in energy management. Additionally, if similar compensation schemes for energy-saving activities were applied to EV owners it could accelerate the wider adoption of EVs and reduce society’s carbon footprint.
Nissan has sold more than 142,000 LEAFs globally since launch. The Nissan LEAF’s power storage capability in its onboard batteries, coupled with the LEAF to Home power supply system, is proving attractive to many customers.