 Work under these concessions had not begun and by the end of the war the British occupying forces refused to recognize their validity.Under the British administration, concessions from the Mandatory government were given.On 12 September 1921, the British formally signed the “Auja (or Yarkon) Concession” which granted Pinhas Rutenberg's Jaffa Electric Company a 70-year concession granting it exclusive rights to generate, distribute, and sell electricity in the administrative District of Jaffa, and authorized Rutenberg to generate electricity by means of hydroelectric turbines that would exploit the water power of the Auja (Yarkon) river.