The company is also offering to return cash throughout the loan’s lifespan, more assets as collateral, a higher interest rate and an early repayment of a first tranche of money due next year.
The requests for proposals were issued by the parent firms to banks on Tuesday, with financing of the expansion to be split between conventional loans and sharia-compliant facilities.
The family group, which collapsed during the financial crisis, said in May that it had direct liabilities to financial institutions worth around $6 billion.
Oman’s State General Reserve Fund, Royal Dutch Shell and existing investors in GlassPoint will inject the money, which will be used to accelerate the deployment of solar steam generators.