If Kan really means it, the government will have to abandon the plans for expanding nuclear power it adopted only last year. To make up the energy shortfall, Kan has set the ambitious goal of using renewables.

That is most likely to mean wind, according to a report released last month by the Ministry of the Environment. There is “an extremely large introduction potential of wind power generation”, it says, especially in the tsunami-hit north-east of the country.

“The potential of wind is huge because of the contribution from offshore generation with Japan’s long coastline,” agrees Tetsunari Iida, founder of the Institute for Sustainable Energy Policies in Tokyo, who advocates a 100 per cent switch to renewable energy by 2050. At present, Japan produces just 3 per cent of its electricity from renewables: solar, wind and geothermal. Nuclear contributes 30 per cent.

Taking into account wind strength, available land and the potential for offshore farms, the report estimates that Japan could install wind turbines with a capacity of up to 1500 gigawatts. More realistic estimates in the report suggest that with appropriate financial incentives, turbines with a capacity of 24 to 140 GW could be installed. Assuming the turbines operate a quarter of the time, this would provide up to 35 GW of electricity on average, matching the combined output of about 40 of Japan’s existing 54 nuclear reactors.

Next in line is solar energy, which the report estimates could provide between 69 and 100 GW without taking up any productive agricultural land.

Perhaps surprisingly, given Japan’s 120 active volcanoes and the 28,000 hot springs associated with them,geothermal energy scarcely figures in the ministry’s report. At best, it says, only 14 GW is available, but much of that is inaccessible because of restrictions on development in national parks. At other sites, exploiting geothermal energy would disrupt springs currently used as spas.

A switch to renewables will require huge amounts of new infrastructure. This will need to be paid for by offering special tariffs as incentives for providers to feed energy from renewable sources into the grid. By coincidence, on the morning of 11 March – the day of the earthquake – the Japanese cabinet approved proposals that would achieve this. “It’s under review by the parliament, and could provide a really big push for renewables if it’s passed,” says Iida.

The contribution from renewables to Japan’s electricity supply is currently almost static, having increased from 3.1 to 3.3 per cent between 2008 and 2009. Iida blames “poor policy support” for this lack of growth. So it is possible that as the shock of Fukushima fades, support for renewables will go the same way. However, polls reported this week suggest that two-thirds of Japanese back a shift away from nuclear power.

by Andy Coghlan

Original source: click here

If Australia is to mitigate climate change, we will need to reduce greenhouse gas emissions from electricity and transport fuels by finding ways to harness our clean, renewable resources like the sun and wind.

CSIRO (Australia’s Commonwealth Scientific and Industrial Research Organisation) is developing the next generation of technologies that produce energy from renewables including solar, wind, ocean and geothermal resources. We are also mapping ocean energy and researching its potential and finding new ways to integrate renewable technology into existing electricity grids or for use immediately in the home.

DEVELOPMENTS IN RENEWABLE ENERGY TECHNOLOGIES

Solar energy
Energy from solar power is a proven technology found throughout society, from the abundant photovoltaic solar panels on neighbourhood roof tops to the emerging concentrated solar power industry changing the landscape of desert areas around the world.

Solar technology is everywhere and it works. The challenge is to make it work better, more reliably, and to be comparable in cost to fossil fuels.

CSIRO conducts large scale, world-class solar research and development – specialising in next generation photovoltaic cells and concentrated solar power. The National Solar Energy Centre in Newcastle, NSW, is home to one of the largest high concentration solar array in the Southern Hemisphere, with another solar field currently under construction. Extensive research into organic photovoltaic and dye-sensitized solar cells is also well underway.

Wind energy
CSIRO’s wind research is focusing on improving the forecasting of wind energy, especially in severe weather conditions where production can change rapidly, as well as developing ways to store wind energy for use when the wind isn’t blowing…

CSIRO-developed UltraBattery technology is being trialled to help ‘smooth-out’ the highly variable output from wind farms, increasing average powerline carrying capacity and reducing the need for alternative fast-response back-up services.

Geothermal
Through the Western Australian Geothermal Centre of Excellence, CSIRO is investigating ways to use hot sedimentary aquifers to provide energy for applications such as desalination, air conditioning and power. We are also examining the chemical and mechanical factors that contribute to the management of aquifers in geothermal systems. The research will broaden the use and commercial-scale application of geothermal energy.

In addition to this form of geothermal energy, Australia has some of the richest sources of hot rocks in the world, in the form of high heat-producing granites. To harness this energy we will need to develop cost-effective technologies to access deep hot rock reservoirs, as well as manage geothermal sources to enhance production and be able to transport this energy to the market.

Ocean
Scientists at CSIRO are investigating the potential for wave energy generation in Australia and mapping Australia’s ocean resources.
As part of this work, researchers have identified Australia’s priority regions for harnessing ocean energy and will further refine details of the most suitable locations for commercialisation of wave energy converters, of interest to the wave and current energy industry. Much still needs to be done to address the economic and engineering feasibility of ocean energy generation systems, but the mapping work conducted to date shows the potential of this important renewable resource.

FUTURE OPPORTUNITIES FOR BUSINESSES
As well as renewable energy generation, businesses can make dramatic emissions and cost reductions through energy efficiency measures. Whilst “first step” measures such as changing light fittings can bring significant advantages, even more dramatic savings are possible through smarter control systems. Such systems are relatively inexpensive (they don’t require large pieces of infrastructure), yet they can realise quite dramatic energy savings, whilst allowing business as usual.

CSIRO is working on a number of exciting projects that will be available to businesses in the future, including:
• Optimal air-conditioning control using weather data, energy market pricing and feedback from building occupants to intelligently alter the operation of a building’s air-conditioning system to save energy, money and greenhouse gas emissions.
• Solar cooling using heat from the sun as an energy source which can be used to generate cool air for use in buildings.
• The Virtual Power Station intelligently aggregates renewable energy generators – such as solar panels – and energy storage into a cost-effective and reliable electricity supply network.
• Smart fridges can plan ahead and coordinate when they consume energy in order to smooth the intermittent power output from renewable generators such as wind and solar farms, while keeping within usual temperature limits.

Original source: http://www.businessreviewaustralia.com/business-features/technology/future-renewable-technologies