The installed capacity of the UK's wave and tidal sector has grown 40-fold in the past ten years. Ministers expect similarly impressive growth by 2020. But to achieve this, the country needs arrays.

What was once hailed as an endless source of desert electricity has now fallen by the wayside in the profitability race. Is concentrated solar power condemned to remain a niche player in the energy market.

Deforestation, evictions and high emissions - palm oil from Indonesia and Malaysia have a dubious reputation. Only a few suppliers meet EU sustainability criteria.

Windmills have been turning for millennia, but they have only been producing electricity for 125 years. Scotsman James Blyth is regarded as the inventor of the technology, He could not celebrate his success, as electric power was seen as the work of the devil.

The US has reached a preliminary decision on punitive duties for Chinese solar manufacturers. An anti-dumping case is also now on the cards in the European Union. What are its chances of success?

Kenya is finally starting to systematically exploit its vast geothermal resources. It is counting on renewables to help it upgrade to an emerging economy.

A year on from Fukushima, Japan is only gradually setting a course for renewable energies. Strong resistance from the nuclear lobby, inadequate infrastructure, and a lack of reforms in the energy market are hampering progress.

Germany is outraged at major cuts for solar electricity and at the possibility of cuts to other renewables being snuck in through the back door.

To protect the climate and overhaul our energy supply, we will need to do more than just expand renewables, we will need to do more than just expand renewables - we also have to start using energy more efficiently. But planned EU regulations are meeting with fierce resistance.

The greenhouse gas emissions of biofuels have been under discussion for years. Now studies commissioned by the European Union are putting pressure on biodiesel in particular.