Electrical Power - 2 Questions on power systems and alternative energy

 I have enclosed a scan of the paper, with the questions highlighted in red (questions 3 and 4).

What is needed is:

3) Compare the economics of single and three phase distribution

4) Compare and evaluate the different forms of alternate energy

Understand the economics of components, power systems and alternative energy:

Economics: economic considerations eg power factor correction, energy tariffs, Kelvin’s law,
compact fluorescent lighting; comparisons of single and three-phase systems; high and low
efficiency motors

Alternative energy: geothermal; solar; wind; water; biomass eg liquid biofuel, solid biomass,
biogas

Evaluation: cost (capital, operating); efficiency; energy storage; environmental impact;
feasibility on large and small scale