natural gas / electricity / renewable energy / energy surplus / annual energy needs / gas turbines / i.e. non-greenhouse gas / firm energy / energy adequacy / Energy requirements / energy / i . e .ii . e ..i . e .ei . e ..i . e . i . e .ni . e .oi . e .ni . e .-i . e .gi . e .ri . e .ei . e .ei . e .ni . e .hi . e .oi . e .ui . e .si . e .ei . e . i . e .gi . e .ai . e .si . e . / /