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The cost and effectiveness of zero-carbon power
30 Jul 2014
Electricity demand varies during the day in ways that the supply from wind and solar generation may not match.
Wind and solar power are even more expensive than is commonly thought. Subsidies for renewable energy are one of the most contested areas of public policy. Billions are spent nursing the infant solar- and wind-power industries in the hope that they will one day undercut fossil fuels and drastically reduce the amount of carbon dioxide being put into the atmosphere. The idea seems to be working. Photovoltaic panels have halved in price since 2008 and the capital cost of a solar-power plant – of which panels account for slightly under half – fell by 22 per cent in 2010-13. In a few sunny places, solar power is providing electricity to the grid as cheaply as conventional coal or gas-fired power plants.
But whereas the cost of a solar panel is easy to calculate, the cost of electricity is harder to assess. It depends not only on the fuel used, but also on the cost of capital (power plants take years to build and last for decades), how much of the time a plant operates, and whether it generates power at times of peak demand. To take account of all this, economists use “levelised costs” – the net present value of all costs (capital and operating) of a generating unit over its life cycle, divided by the number of megawatt-hours of electricity it is expected to supply.
The trouble, as Paul Joskow of the Massachusetts Institute of Technology has pointed out, is that levelised costs do not take account of the costs of intermittency. Wind power is not generated on a calm day, nor solar power at night, so conventional power plants must be kept on standby – but are not included in the levelised cost of renewables.
Electricity demand also varies during the day in ways that the supply from wind and solar generation may not match, so even if renewable forms of energy have the same levelised cost as conventional ones, the value of the power they produce may be lower. In short, levelised costs are poor at comparing different forms of power generation.
To get around that problem, Charles Frank of the Brookings Institution, a think-tank, uses a cost-benefit analysis to rank various forms of energy. The costs include building and running power plants, and those associated with particular technologies, such as balancing the electricity system when wind or solar plants go offline or disposing of spent nuclear-fuel rods. The benefits of renewable energy include the value of the fuel that would have been used if coal- or gas-fired plants had produced the same amount of electricity and the amount of carbon-dioxide emissions that they avoid. It makes wind and solar power look far more expensive than they appear on the basis of levelised costs.
Comparing zero-carbon with conventional
Mr Frank took four sorts of zero-carbon energy (solar, wind, hydroelectric and nuclear), plus a low-carbon sort (an especially efficient type of gas-burning plant), and compared them with various sorts of conventional power. Obviously, low- and no-carbon power plants do not avoid emissions when they are not working, though they do incur some costs. So nuclear-power plants, which run at about 90 per cent of capacity, avoid almost four times as much CO2 per unit of capacity as do wind turbines, which run at about 25 per cent; they avoid six times as much as solar arrays do. If you assume a carbon price of $US50 ($53) a tonne – way over most actual prices – nuclear energy avoids over $US400,000-worth of carbon emissions per megawatt of capacity, compared with only $US69,500 for solar and $US107,000 for wind.
Nuclear power plants, however, are vastly expensive. A new plant at Hinkley Point, in south-west England, for example, is likely to cost at least $US27 billion. They are also uninsurable commercially. Yet the fact that they run around the clock makes them only 75 per cent more expensive to build and run per MW of capacity than a solar-power plant, Mr Frank reckons.
To determine the overall cost or benefit, though, the cost of the fossil-fuel plants that have to be kept hanging around for the times when solar and wind plants stand idle must also be factored in. Mr Frank calls these “avoided capacity costs” – costs that would not have been incurred had the green-energy plants not been built. Thus a 1MW wind farm running at about 25 per cent of capacity can replace only about 0.23MW of a coal plant running at 90 per cent of capacity. Solar farms run at only about 15 per cent of capacity, so they can replace even less. Seven solar plants or four wind farms would be needed to produce the same amount of electricity over time as a similar-sized coal-fired plant. And all that extra solar and wind capacity is expensive.
If all the costs and benefits are totted up using Mr Frank’s calculation, solar power is by far the most expensive way of reducing carbon emissions. It costs $US189,000 to replace 1MW per year of power from coal. Wind is the next most expensive. Hydropower provides a modest net benefit. But the most cost-effective zero-emission technology is nuclear power. The pattern is similar if 1MW of gas-fired capacity is displaced instead of coal. And all this assumes a carbon price of $US50 a tonne. Using actual carbon prices (below $US10 in Europe) makes solar and wind look even worse. The carbon price would have to rise to $185 a tonne before solar power shows a net benefit.
There are, of course, all sorts of reasons to choose one form of energy over another, including emissions of pollutants other than CO2 and fear of nuclear accidents. Mr Frank does not look at these. Still, his findings have profound policy implications. At the moment, most rich countries and China subsidise solar and wind power to help stem climate change. Yet this is the most expensive way of reducing greenhouse-gas emissions. Meanwhile Germany and Japan, among others, are mothballing nuclear plants, which (in terms of carbon abatement) are cheaper. The implication of Mr Frank’s research is clear: governments should target emissions reductions from any source rather than focus on boosting certain kinds of renewable energy.
The Economist
The Australian Financial Review
