Analysis of information sources in references of the Wikipedia article "Tarbela Dam" in English language version.
The original T4 project was estimated to cost $928m, but the project authorities had been able to conclude the project contract at $651m.
Since the project cost was much lower than estimates finalized in consultation with the World Bank ($840m), the bank not only approved $51m acceleration programme but also agreed to divert about $150m, saving another 1,400MW for Tarbela 5th Extension project which is expected to be completed by June 2018.
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(help)Executive Directors approved a Tarbela Fourth Extension Hydropower Project Loan and Credit for the Islamic Republic of Pakistan in the amount of US$440 million equivalent (IDA Credit) and US$400 million (IBRD loan) respectively on the payment terms and conditions set out in the President's Memorandum (R2012-0036 [IDA/R2012- 0044]).
The Project would be financed by an IBRD loan of US$400 million, an IDA Credit of US$440 million equivalent, and WAPDA financing of US$74.0 million
...and Interest During Construction (IDC) of US$83.5 million, assuming IBRD and IDA terms for the loan.
Pages 88 and 89
IDA lends money on concessional terms. This means that IDA credits have a zero or very low-interest charge and repayments are stretched over 25 to 38 years, including a 5- to 10-year grace period. IDA also provides grants to countries at risk of debt distress.