Renewables and electrification will require substantial battery capacity to manage the supply/demand question in the duck curve. This offers local authorities’ opportunities. Policy and consumer trends will increase EV uptake, not only will this dramatically reduce exhaust-based emissions, decarbonising and improving air quality, but will also create significant battery capacity.
Kaluza, Ovo, and others have been pioneering trials around specialist V2G chargers. Kaluza have produced a case study for Ofgem. Renewables may require costly upgrades to the National Grid; V2G could accelerate renewable deployment by utilising EV batteries instead. The average car is parked 23 hours a day: during surpluses it is charged with electricity sold back to grid during peak periods. Kaluza estimates this could save £3.5bn in grid infrastructure reinforcement, storage, and generation and earn drivers up to £725 a year just for having their vehicle plugged in.
Concerns have been raised over the impact on battery life that could be caused by additional charging/discharging cycles. However, research has indicated the potential to both decrease or extend battery life depending on consumer behaviour. A study led by the University of Warwick has demonstrated that battery life could be extended if optimal charging strategies are followed, which will likely require automation in the charging process as well as consumer education.
Urban Greening
The benefits of green infrastructure are well-known, from mental health and biodiversity to urban heat islands, street values and air quality. Plantings can also be used to create physical barriers between transport modes and redirect polluted air away from residents. Replacing parking spaces with parklets can maximise co-benefits.
Waltham Forest has installed three “CityTree” devices which use moss to purify air. The manufacturer claims one device is equivalent to 275 trees and removes 240 tonnes of carbon dioxide per annum, also implemented in Hong Kong, Paris, Berlin and elsewhere, these trials should be watched with interest to see their real-world impacts.
Direct Measures
Local authorities can also implement measures that directly reduce emissions, such as removing parking bays, reducing speed limits and designating low emission zones. Working with the private sector, councils can support car clubs, cargo-bikes and cycle-to-work schemes. Lobbying, assistance, and procurement can also shape local ecosystems. Subsidising and increasing the frequency and reliability of public transport is effective. In Southampton, buses were fitted with air filters.
Conclusion
Poor air quality is a major detriment to health, wellbeing, the environment, and cultural heritage. It also impacts economic development and dissuades people from being outside. As cities continue to grow, managing air quality and traffic will be essential. Local authorities need a proactive approach, utilising co-benefits, to improve air quality whilst also achieving health and economic ambitions to achieve vibrant, social and walkable communities.