Time to scrap "conventional" energy subsidies

In conversations with the uninitiated, I often get asked the question of how much renewable energy costs compared with conventional energy from fossil fuels or nuclear power. The assumption is always that renewable energy costs more. Today, Greenpeace and the European Renewable Energy Council want to put the record straight. They've published a report on the relative costs of renewable energy and conventional energy, and their key finding is that renewable energy costs less, not more -- and a lot less.
In their joint report "Future Investment - A sustainable investment plan for the power sector to save the climate" Greenpeace and Erec point out that a global move from fossil fuels and nuclear to renewable energy would cost just a tenth of what it will cost to keep burning fossil fuels, and that investment in renewable electricity could save up to $180 billion a year in fuel costs and cut carbon dioxide emissions in half by 2030.

Key to these arguments is the vast amount that must be spent on building 10,000 new fossil fuel power plants to power emerging economies like China, India and Brazil and the impact that all this additional demand would have on the price of oil, gas and and coal from finite resources

But there's more to it than that. The report quotes UN estimates that $250 billion a year is spent globally on subsidies to conventional energy industries -- and that could be saved if the subsidies were scrapped.

Is it not high time to scrap all subsidies for "conventional" energy? Would we even need subsidies for renewables if the playing field were levelled?