Copenhagen aims to be carbon-neutral by 2025. Commercial and residential buildings are to reduce electricity consumption by 20 percent and 10 percent respectively, and total heat consumption is to fall by 20 percent by 2025. Renewable energy features such as solar panels are becoming increasingly common in the newest buildings in Copenhagen. District heating will be carbon-neutral by 2025, by waste incineration and biomass. New buildings must now be constructed according to Low Energy Class ratings and in 2020 near net-zero energy buildings. By 2025, 75% of trips should be made on foot, by bike, or by using public transit. The city plans that 20–30% of cars will run on electricity or biofuel by 2025. The investment is estimated at $472 million public funds and $4.78 billion private funds.