 The generators are manufactured by two joint ventures . One of them includes Alstom , ABB Group , <unk> , and the Chinese company <unk> Motor . The other includes Voith , General Electric , Siemens ( abbreviated as <unk> ) , and the Chinese company Oriental Motor . The technology transfer agreement was signed together with the contract . Most of the generators are water @-@ cooled . Some newer ones are air @-@ cooled , which are simpler in design and manufacture and are easier to maintain . 
