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Pyranometers Versus Reference Cells for Solar Monitoring

As the solar industry gains momentum, there is an increasing need for on-site resource monitoring using pyranometers and reference cells. Peter N. Johnson of AWS Truepower introduces the technical specifications and limitations of industry-standard pyranometers and reference cells, and outlines best practices for monitoring with this equipment. How solar measurements can be used to improve resource and energy estimates for utility-scale PV projects is also discussed. Read more


Use Data to Boost Output Over Entire Portfolio

July 2014

Wind-farm operators are looking to new, ever more sophisticated approaches to better manage their existing projects, using data analytics and software upgrades as well as predictive maintenance to improve the productivity and availability of their turbines. Read More


The Value Proposition of Load Coincidence and Offshore Wind

January 2014

Offshore wind energy development along the eastern seaboard of the US is based on many potential value propositions. Among offshore wind’s many attributes, none is more compelling than how it mirrors the demand profile for US load centers. Read More


Wind Speed Only Tells Part of the Story

July 2013

This article discusses various factors that need to be considered when planning wind projects in low-wind sites, including transport, meteorological conditions and wind speeds. Read More


Evaluation of Four Numerical Wind Flow Models for Wind Resource Mapping

November 2012

A wide range of numerical wind flow models are available to simulate atmospheric flows. For wind resource mapping, the traditional approach has been to rely on linear Jackson–Hunt type wind flow models. Mesoscale numerical weather prediction (NWP) models coupled to linear wind flow models have been in use since the end of the 1990s. In the last few years, computational fluid dynamics (CFD) methods, in particular Reynolds-averaged Navier–Stokes (RANS) models, have entered the mainstream, whereas more advanced CFD models such as large-eddy simulations (LES) have been explored in research but remain computationally intensive. Read More


Latest Solar Forecasting Tools Help Operators Maintain Grid Stability

July 2012

This article discusses how new technologies can determine where clouds lurk and when they will threaten solar system output. The article explains as the United States solar generating capacity grows, forecasting tools will need to be developed to enable the variability of the solar power production to be more effectively and economically managed; an integrated solar forecast system must be able to accurately predict the evolution of the sky-light as it is influenced by changes in the atmosphere’s optical depth. Read More


Wind and Solar Project Due Diligence: An In-depth Look at Risks That Can Make or Break a Project

July/August 2012

This article analyzes the risks affecting renewable projects. While some of the technical areas addressed are straight forward pass/fail scenarios, some are dynamic and variable throughout the life of the plant. The article discusses an in-depth look at risks that can make or break a project. Read More


How Wind Forecasting Can Optimize Plant Performance

May 2011

AWS Truepower shares expertise and trends on how quality performance data and forecasting can optimize wind plant production. Read More


Boost Data Accuracy at Higher Levels

May 2010

With wind blades on taller turbines now spinning at more than twice the height of standard 60-meter meteorological towers, the ability to assess proposed wind plant sites with remote sensing technology is essential. Remote Sensing can be a cost-effective way to obtain accurate wind-speed data at greater hub heights. Read More


Does Climate Change Threaten Wind Resources?

May 2009

This article discusses how atmospheric circulation patterns can determine a region’s vulnerability to significant long-term drops in wind speed. Read More


A Regional Assessment of the U.S. Offshore Wind Energy Resource Through the Use of Mesoscale Modeling

May 2009

Rapidly developing interest in US offshore wind power has brought about the need for tools to accurately evaluate and depict wind power availability. This article discusses the data assimilation and modeling methods used to characterize the offshore wind environment through examples of resource mapping, observational studies, and model simulations. Read more


Predicting Sudden Changes in Wind Power Generation

October 2008

This article discusses how the varying sets of challenges that accompany ramp-event forecasting are dependent on the nature of the weather event causing the ramp. Download Article