Tidal Energy:
The water of the sea daily causes high and low tides at the coast which can be used to produce electricty. For this purpose barrages are built suitable sites on the coast and at high tide the ledge is filled with sea water and at the time of low tide when the water is allowed to run down through slanting trenches in which turbines are fixed which convert this tidal energy into electricity (this method is successfully followed in france and 240 MW electricity is generated by this method).
Wind Energy:
On the sea cost where powerful speedy winds below wind mills are set up which convert the energy of wind into electricity (it is followed in Holland successfully).
Geothermal Energy:
Inside the earth molten magma is formed. If this magma contacts underground water, it produce steam. In coastal areas of Baluchistan and Sindh this energy of steam can be converted into produce electricity. In Pakistan one such power house has been built which uses the hot water springs for this purpose Italy, Japan and Mexico are using this method successfully.