In the case of natural gas, the bulk of production is from Western Australia and Queensland. (rba.gov.au)
Differences in energy prices across Europe depend on specific commercial agreements between companies (especially in the case of natural gas) and on infrastructures, far more than they depend on international markets regulation. (blog.politics.ox.ac.uk)
The key factors, they found, are power plant efficiency and, in the case of natural gas plants, methane leakage during the supply process. (sciencedaily.com)