I think it would be less click-baity to re-write your first sentence as: "I put 7.3kw of panels on our roof for a $8k interest free loan and a $5k rebate."

I think it would be less click-baity to re-write your first sentence as: "I put 7.3kw of panels on our roof for a $8k interest free loan and a $5k rebate." > The price of power is also pre approved to increase a minimum of 5% a year every year here, so the savings will be more than that. That 5% growth rate sounds economically unsustainable. Power prices in rich, highly-developed countries in the last 50 years surely have grown much slower than 5% per year.