A powerful oligopoly?

Energywatch, an industry watchdog, has argued in a recent report to MPs that Britain’s electricity and gas supply industry is a “comfortable oligopoly” that feels little need to innovate or compete. They have called for the sector to be subject to a Competition Commission investigation.

Power companies are ripping off consumers Times Online (21/5/08)
Age of cheap power is over Times Online (21/5/08)
Call to investigate energy ‘oligopolies’ Guardian (21/5/08)

Questions

1. Explain the main characteristics of an oligopolistic industry.
2. What aspects of the electricity and gas supply market would the Competition Commission consider if asked to investigate the industry?
3. Assess the extent to which the electricity supply industry exhibits oligopolist collusion.