Location - Sustaining the City

Haven largely runs on clean energy. Solar and wind power is common for much of the urban environment, and solar and wind farms dot the countryside. Water power is also used, especially for those locations that are closer to the river Thames.
The fae, as the ancient race they are, and with the tie to nature that they have, oftentimes use their connection to nature to help power things using manipulation of air currents, fire, water, and earth.
Haven is almost completely self-sustaining, with mostly consumer good imports coming from London and surrounding areas. Agriculture is big in Haven, with much of the food coming from local farms, ranches, and orchards.
Haven exports include, mostly, whole foods, natural remedies, and energy. Agriculture plays a big part in exports, as Haven grows more food than it uses or needs. Sustainable energy is also exported, though this is much trickier to sell without giving away the location of, or information about, Haven. Magic is a highly illegal form of trade outside of the city, as it could potentially expose Haven to the rest of the world. If the Haven law enforcement finds that magical items or services are being smuggled/performed outside of Haven, disciplinary action will be taken.
Haven imports include wild caught ocean seafood, as there is not really a place for ocean fishing to happen in Haven. Other imports include animal feed for exotic shifter species, and human blood for the consumption of vampires. Medicine and medical treatment and equipment are other imports of Haven, as well as computers and technology.