Produce a long descriptive sentence that uses all these words: Heysham 1 CONNECTED_TO_GRID 1983; Heysham 1 CONSTRUCTION_STARTED 1970; Heysham 1 NET_MWE 1150; Heysham 1 COMMERCIAL_OPERATION 1989; Heysham 1 ACCOUNTING_CLOSURE_DATE 2019
Construction of Heysham 1 started in 1970.