Scientists at the University of Leeds and the Chinese Academy of Sciences looked at ways to cope with demands on a national power grid that can vary widely at different times of the day, a Leeds university release said Wednesday.

Power demands usually peak in the early evening after the mass exodus toward home from school and work, and short-lived spikes in demand are common after televised sports events or during commercial breaks, the release said.

Energy companies typically deal with the demand spikes with electricity from power plants that are only switched on to cope with the peaks. But the gas-fired generators often used to feed these peaks are notoriously inefficient and expensive to run, and sit idle for long periods of time, researchers say.

University of Leeds Professor of Engineering Yulong Ding and colleagues propose a more environmentally friendly system that would store excess energy made by a plant supplying the "base" demand and use this to supply the "peaks" in demand as and when they happen.

The key idea would be to use excess energy -- not needed during "base" demand times -- to power a unit producing liquid nitrogen. At times of peak demand, the nitrogen would be boiled, using heat from the environment and waste heat from the power plant, to drive a turbine or engine generating "top up" electricity to deal with demand spikes.

"On paper, the efficiency savings are considerable. We now need to test the system in practice," Ding said.

earlier related report
Bangladeshis protest power shortages
Dhaka, Bangladesh (UPI) Aug 12, 2010 - Protests against power shortages in energy-starved Bangladesh turned violent as the country experiences a record 2,000-megawatt shortfall against a demand for at least 6,000 megawatts of electricity.

Hundreds of people stormed a power office in Narayanganj, a town outside Dhaka Tuesday. At least 50 people, including policemen, were injured.

Protesters blocked roads and railways, with similar violent protests reported in northwestern Rajashahi and six other towns.

"Attempts to destabilize law and order by protesting about issues of power, gas and water will be dealt (with) strictly," Home Minister Sahara Khatun told reporters Tuesday after an emergency inter-ministerial meeting, Press Trust of India reports.

She said the government would make "maximum efforts" ensure uninterrupted supply of water, electricity and natural gas, particularly during the month of Ramadan, which began Wednesday, adding that it would depend "on the capacity of relevant departments."

Only about 40 percent of Bangladeshis have access to electricity, with frequent power outages the norm across the country.

Water shortages are also a problem. The 2010 Global Annual Assessment of Sanitation and Drinking Water by the World Health Organization states that more than 30 million people in Bangladesh do not have access to safe drinking water.

Prime Minister Sheikh Hasina blamed the country's power crisis on the former BNP-Jamaat coalition government, saying that it had kept the power sector in a fragile state.

"During our previous tenure from 1996 to 2001, we have raised the country's power production to 4,300 megawatts from 1,600 megawatts and undertaken various projects to raise generation up to 5,500 megawatts," The Daily Star quoted her as saying Tuesday.

But when the BNP-Jamaat government assumed office, she said, it didn't take the initiative to raise power production.

"Rather, they had destroyed the vital sector through looting and mismanagement that increased sufferings of the people," she said.

Hasina said her administration has added 1,000 megawatts of electricity during the last year and a half and has taken steps to increase power production by setting up new plants and repairing old ones.

"We are making all out efforts to improve the situation to minimize sufferings of the people," the premier said.

Bangladesh signed a landmark 35-year power transmission agreement with India last month to import 250 megawatts of electricity starting from late 2012.

In May, Bangladesh and Russia signed a framework agreement for Bangladesh's first nuclear plant, expected to produce at least 2,000 megawatts of electricity by 2020.

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