Because of a combination of factors, such as environmental concerns, high oil prices and the potential for peak oil, development of cleaner alternative fuels and advanced power systems for vehicles has become a high priority for many governments and vehicle manufacturers around the world.
Karena kombinasi beberapa faktor, misalnya kepedulian lingkungan, tingginya harga minyak, adapnya pengembangan bahan bakar alternatif yang lebih ramah lingkungan, maka pengembangan kendaraan bahan bakar alternatif telah menjadi prioritas utama bagi pemerintah dan produsen otomotif di banyak negara di dunia.