The following paragraphs provide a number of examples. There are a variety of economic instruments available to increase sustainable energy supply. One relatively simple option is to waive import duties and value-added tax to minimize the investment burden on the private sector and stimulate an increase in the supply of decentralized renewable energy technologies. The Government of Kenya has had much success using this approach to attract private sector investment for PV systems: over 200 companies and thousands of technicians now promote small solar systems for rural households.