Archive: Renewables

Oregon wind turbine loses its bearings

The generator bearings on a wind turbine located in Oregon (Figure 1) first failed in May 2006, only 11 months after the tower was brought on-line. The company that owns and operates the wind farm replaced the bearings and slip rings, but the new bearings failed only five months later. Once again, new bearings and […]

520004db57ca0-120108_WindClipper_Fig1

The return of the Clipper Liberty wind turbine

The Steel Winds project in Lackawanna, New York, was selected as a POWER 2007 Top Plant because of its unusual location (a former steel mill and Superfund site) and because it was the first commercial deployment of the Clipper Windpower 2.5-MW turbine. That report was written just as the project entered commercial service but before a major gearbox problem was identified. For many new designs, it isn’t a question of if problems will occur but of how the manufacturer responds when problems inevitably do occur. For its handling of Liberty’s problem, Clipper Windpower gets an "A."

California’s GHG plan gives power heaviest load

On Sept. 12, the California Public Utilities Commission (CPUC) and California Energy Commission (CEC) took the next step in the implementation of Assembly Bill (AB) 32, California’s ambitious greenhouse gas (GHG) emissions – reduction initiative, with the release of a 300-page proposed decision on GHG regulatory strategies.

520004db48bea-110108_GM_Fig4

Advanced tidal stream project planned for UK coast

Scotland is strategically placed at the widening funnel in which the churning waters of the North Sea meet those of the Norwegian Sea. The region is thought to have 25% of Europe’s tidal power resources and 10% of its wave power potential. Recently, the Crown Estate, which owns the UK seabed and controls the rights […]

520004db49fec-110108_PowerPolicyWebOnly

Under construction in South Africa

This summary of power generation projects is a web-only supplement to the November 2008 special report titled “Whistling in the dark: Inside South Africa’s power crisis.”

520004dd98047-10-06

U.S. sees 20% jump in planned geothermal

The U.S., which continues to lead the world in on-line geothermal energy capacity, saw a 20% jump in new power projects since January this year, a survey released by the Geothermal Energy Association (GEA) in August showed.

520004dd980af-10-07

New workshop completes first overhaul

In early August, a special transport departed from Voith Siemens Hydro’s Heidenheim workshop bearing the company’s 300-ton, 300-MVA hydro motor-generator back to Schluchseewerk AG’s Wehr pumped-storage station in Germany’s Black Forest.

520004dd9811c-10-08

Scorching asphalt and solar power

Through asphalt, researchers are looking to develop a solar collector that could turn roads and parking lots into ubiquitous—and inexpensive—sources of electricity and hot water.

520004dd8833c-10-01

Global Monitor (September 2008)

Cost hikes for all things nuclear in the U.S. and UK / North Americans plan liquid makeover for coal / California balloon bill deflates in legislative process / The Lego skyscraper / Of manure and methane / U.S. small wind turbine market moving slowly / Israeli desert center tests solar thermal tech for California desert / POWER digest / Correction