The UK is one of just a handful of countries which score an "AAA" rating for secure, affordable and environmentally-friendly energy, a UN-accredited study has found.
The country came fifth out of 129 countries in the World Energy Council's (WEC) energy sustainability index this year, falling three places as it has seen "small declines" in the security of supplies and affordability of energy.
But the UK is only one of two countries, along with Switzerland which topped the index overall, to be ranked in the top 20 on all three sections of the "trilemma" of achieving security, equity and environmental sustainability in energy supplies.
As Ed Miliband clashes with the energy giants on prices, it is worth knowing how your expensive energy bills are actually made up.
A leading competition lawyer says an energy price freeze could leave Labour open to challenges from the courts or the European Commission.
Whether or not you approve of a state intervention into industry, there are at least two big potential obstacles for an energy price freeze.