The National Grid Corporation proposes to construct a new nuclear power plant to meet the increased demand for electricity. The plant will cost $$2\mathrm{.}2$ billion to build. Cash flows provided by the plant will amount to $$300$ million per year for $15$ years. At the end of year $15,$ the plant will be decommissioned. The cost of decommissioning is estimated to be $$900$ million. Calculate the project$$s NPV if the discount rate is $5\%.$