Technologies are scaling up quickly to meet industry needs.
Like other California electric utilities, San Francisco-based Pacific Gas & Electric (PG&E) has been scrambling to meet the state’s renewable portfolio standard (RPS), which requires suppliers to obtain at least 20 percent of their power from renewable energy sources by 2010. Though the RPS includes a variety of technologies, renewables developers are choosing utility-scale solar power more than any other resource, says Hal La Flash, PG&E’s director of emerging clean technologies.
Rewards, challenges and options for rate-based investments.
Paul Alvarez and Benjamin Hodges
Utilities traditionally have met renewable portfolio standards with power purchases from IPPs. But new approaches are allowing utilities to build their rate bases with investments in solar generation.
Ocean thermal energy conversion offers a timely renewable alternative.
C.E. (Gene) Carpenter, Jr., et al.
23 million square miles of tropical oceans daily absorb solar radiation equal in heat content to about 250 billion barrels of oil. Ocean thermal energy conversion technologies convert this solar radiation into electrical power by exploiting the thermal gradient temperature differences between the surface and the depths. This enormous resource merits a closer look as policy makers consider alternative technologies for serving future energy demands.
Price transparency will drive GHG reductions.
Fred Wellington and Michael Scholand
In light of coming GHG legislation, price transparency is the key to achieving cleaner generation through the dispatch of lower-carbon sources.
Effective metrics give solar its due credit.
Photovoltaic (PV) power generation is an intermittent, non-dispatchable resource generally considered as energy-only with no capacity credit. However, there is ample evidence that solar energy reliably is available at peak demand time when loads are driven by day-time commercial air conditioning, and can contribute effectively to increasing the capacity available on a regional grid.
New approaches account for the economic benefits of renewables.
Many green power customers benefit from long-term fixed prices. The most effective programs recognize the value of this price hedge—and fairly exempt customers from fuel cost adders in utility rates.
Plug-in hybrids usher a new era for wind power.
Plug-in hybrid vehicles (PHEVs) open a new intersection between wind power and transportation.
As green mandates tighten, utilities scramble to comply.
Mandatory renewable portfolio standards are becoming the norm. But after low-hanging green fruits are harvested, renewable power might get scarce. Many utilities will struggle to meet RPS requirements until lawmakers create stable federal policies and a national market for green credits.
Market forces are transforming the IOU business model.
As market forces transform the IOU business model, Apple’s iPhone provides a metaphor and possible example for the industry to follow. The iUtility will emerge as companies renegotiate the regulatory compact and reinterpret the traditional rate formula.
Distributed solar modules are gaining ground on concentrated solar thermal plants.
Jonathan Lesser and Nicolas Puga
Photovoltaic technologies are beginning to appear more attractive than concentrated solar thermal plants. PV’s competitiveness is improving from technical and operational advancements, as well as significant commitments made by such utilities as Southern California Edison. In the long run, distributed central PV plants likely will gain a strong market position.
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