EDF, which has three million domestic customers, is the fifth major energy firm to announce price rises and it is the biggest average increase so far.
FoE Scotland chief executive Duncan McLaren said wave and tidal power could supply a fifth of UK energy needs and that Scotland was ideally placed to generate a significant amount of that energy.
BBC: NEWS | UK | Scotland | Positive waves over power project
Even so, says Neville Jackson of Ricardo, there remains much scope for improvement: petrol and diesel cars still typically use less than a fifth of the energy stored in their fuel to turn the wheels.
Van der Hoeven says countries can achieve energy savings equivalent to nearly a fifth of global demand in 2010, making energy efficiency just as important as energy supply.
Chevron is the fifth-largest integrated energy company in the world.
Milford Haven is a natural deep water port that handles around a fifth of the UK's energy through oil and gas imports.
Right now, America gets about one-fifth of our electricity from nuclear energy.
This year's economic plan makes an ambitious commitment to cut energy use by a fifth over the next five years, but environmentalists remain sceptical.
Finished energy goods registered their fifth consecutive month of gains, up 3.3% on rising prices for gasoline, home heating oil, and residential electric power. (Read Why World Food Prices Will Keep Climbing).
FORBES: PPI Surges: Food Rises Most Since '74 As Fuel Gains 3.7% In A Month
Gathering data from several of Cisco's test customers, he found that the cost to operate the router is a fifth to a half the combined energy usage and maintenance costs of the hardware that hosts the same services.
Natural gas has upped its share of world energy supply to one-fifth (2.3 Btoe), from one-sixth (1 Btoe) in 1973.
Note: This is the fifth in a series of posts on clean energy and climate solutions in Denmark.
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James Rogers, chief executive of Duke Energy, has called it the "fifth fuel"--on top of coal, natural gas, nuclear power and renewable resources.
Renewable energy is now the fastest growing sector of the energy mix and accounts for almost one-fifth of all electricity produced worldwide.
FORBES: International Energy Agency (Finally) Acknowledges Ascent of Renewable Energy Market
There would be plenty of other losers too, from the nations that depend on a steady flow of Middle East oil to stabilize global energy prices to the shippers that count on the Fifth Fleet for protection to the local companies that help sustain U.S. forces in the region.
FORBES: What Happens When America No Longer Needs Middle East Oil?
Sweden creates energy for around 250, 000 homes and powers one-fifth of the district heating system, Swedish Waste Managements says.
The world's richest fifth consume 86% of its goods and services, over half its energy and nearly half its meat and fish.
And fifth, we need to develop a range of financing models that will allow energy technologies to develop and thrive in the market.
FORBES: Re-shaping the Department of Energy in Obama's Second Term: Picking a New Energy Secretary
Second, an energy shortage obliged the government to impose rationing aimed at cutting electricity consumption by a fifth.
ECONOMIST: Argentine, and other, woes are dragging the region down
Investments in clean energy technologies that are helping us reduce our dependence on foreign oil would be cut by nearly a fifth.
WHITEHOUSE: President Obama Speaks at the Associated Press Luncheon
James Rogers, chief executive of Duke Energy (nyse: DKE - news - people ), has called it the "fifth fuel"--on top of coal, natural gas, nuclear power and renewable resources.
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