Germany’s Grid: Renewables-Rich and Rock-Solid

Grid graph German Energy TransitionLast Friday Germany’s grid regulator released the 2013 data for grid reliability, and the figures have renewable energy advocates crowing. The latest numbers (released in German) reveal no sign of growing instability despite record levels of renewable energy on the grid — 28.5 percent of the power supplied in the first half of 2014. In fact, Germany’s grid is one of the world’s most reliable.

According to the Bundesnetzagentur, unplanned outages left the average German consumer without electricity for 15.32 minutes in 2013, down from 15.91 minutes in 2012 and 21.53 minutes in 2006. The performance, using the power industry’s System Average Interruption Duration Index (SAIDI), affirms Germany’s place in the top five for grid reliability for European countries.

German grid reliability, meanwhile, far outstrips the best SAIDI results delivered by U.S. and Canadian utilities. The top quartile of SAIDI results captured by last year’s North American reliability benchmarking exercise by the IEEE Power & Energy Society, for example, had consumers without power for an average of 93 minutes — six times longer than outages experienced by the average German consumer.

What makes Germany’s grid reliability notable is the repeated insistence by critics of renewable energy that blackout risk is rising under the German Energiewende or ‘energy transition’. As Craig Morris, lead author of the Berlin-based German Energy Transition, writes this week: “The news may come as a surprise to international critics of the Energiewende.”

Morris highlights one critical piece published by the Washington, D.C.-based Institute for Energy Research on the day that the Bundesnetzagentur released its data. The free market, fossil fuel-oriented group argues that German laws driving the installation of relatively clean but intermittent energy sources such as wind turbines and solar panels have already caused a “destabilization of the grid.”

The outcome of the Energiewende, predicts the group, will be “a higher potential for blackouts.” As Morris’ post this week notes, the most likely reason for Germany’s grid reliability is the preponderance of underground lines in the distribution networks. Over 80 percent of Germany’s low-voltage lines and over 90 percent of its medium-voltage lines are underground. Other European countries scoring high on SAIDI have similar preponderance of underground distribution, including Denmark, Switzerland and the Netherlands, according to a December 2013 reliability assessment from the Brussels-based Council of European Energy Regulators.

For Germany to maintain its reliability, it may ultimately need a lot more lines. A December 2012 study by the Berlin-based German Energy Agency or DENA found that continued growth in renewables would require 135,000-193,000 kilometers of new lines by 2030, and the upgrading of another 21,000-25,000 km. Stephan Kohler, DENA’s CEO, raised doubts that distributors could handle that €27.5-42.5 billion investment, despite financing mechanisms provided by the Bundesnetzagentur to spur investment: “The Federal Network Agency legally mandated an attractive profit. However, our study reveals that in practice the profits from increasing integration of renewable energy systems … are not adequate for the distribution grid operators to survive.”

Upgrades are, however, proceeding at the transmission level. Germany’s transmission operators are planning a set of internal high-voltage direct current (HVDC) lines that are expected to help distribute wind power generated in the North to consumers in the South, and to help push excess solar generation in the opposite direction.

The controllability of those HVDC lines should also be a boon for Germany’s neighbors. North-South power flows regularly loop out of Germany’s grid and hitch a ride over neighboring transmission grids instead. That’s an added burden that Poland, in particular, doesn’t need. While German consumers enjoy the highest levels of reliability, those in neighboring Poland suffered through an average of 254 minutes of unplanned outages in 2012. In other words, Poland’s grid operators have all the work they need just managing their internal system challenges.

This post was created for Energywise, IEEE Spectrum’s blog on green power, cars and climate

NASA Launches its First Carbon-Tracking Satellite

Photo: Bill Ingalls/NASA

Photo: Bill Ingalls/NASA

It’s been a rough birthing process for NASA’s Orbiting Carbon Observatory (OCO) satellite program, which promises global tracking of carbon dioxide entering and leaving the atmosphere at ground level. Five years ago the first OCO fell into the Antarctic Ocean and sank, trapped inside the nose cone of a Taurus XL launch vehicle that failed to separate during launch. The angst deepened yesterday when NASA’s Jet Propulsion Laboratory (JPL) scrubbed a first attempt to launch a twin of the lost $280-million satellite, OCO-2, after sensors spotted trouble with the launch pad’s water-flood vibration-damping system less than a minute before ignition.

But this morning OCO’s troubles became history. At 2:56 a.m. PDT a Delta II rocket carrying the OCO-2 satellite roared off the pad at Vandenberg Air Force Base in California. According to JPL, the OCO separated from the Delta II’s second stage 56 minutes later and settled into an initial 690-kilometer-high orbit. If all goes well it will maneuver into a final 705-km orbit over the next month, putting it at the head of an international multi-satellite constellation of Earth-observing satellites known as the A-Train. Continue reading

Renewables to Dethrone Nuclear Under French Energy Plan

After months of negotiation, the French government has unveiled a long-awaited energy plan that is remarkably true to its election promises. The legislation’s cornerstone is the one-third reduction in the role of nuclear power that President François Hollande proposed on the campaign trail in 2012.

Under the plan, nuclear’s share of the nation’s power generation is to drop from 75 percent to 50 percent by 2025, as renewable energy’s role rises from 15 percent today to 40 percent to make up the difference. That is a dramatic statement for France, which is the world’s second largest generator of nuclear energy, after the United States. France has a globally-competitive nuclear industry led by state-owned utility Electricité de France (EDF) and nuclear technology and services giant Areva. Continue reading

Amid Blackouts, India’s New Leader Vows 24-7 Power for All

Blackouts this week in New Delhi and surrounding states are providing a dramatic backdrop for a bold promise by India’s new prime minister, Narendra Modi, whose Hindu nationalist party swept to power in a landslide election last month. As a scorching heatwave drove power consumption beyond the grid’s capacity, Modi’s government vowed to deliver “round-the-clock power for all by 2022,” reports the Wall Street Journal.

That will be an awesome task. Nearly one-quarter of India’s 1.26 billion citizens lack grid access. And India’s utilities have struggled to keep up with demand from those who are connected. Power cuts are frequent. Continue reading

Floating Wind Turbines Headed for Offshore Farms

PrinciplePower.WindFloatFloating wind power is no longer science fiction. Promising results from five test platforms operating worldwide—including three in Japan—are turning into project plans for a first generation of floating wind farms. Industry analyst Annette Bossler, who runs Bremen, Maine-based Main(e) International Consulting, predicts that the number of test platforms will nearly double over the next two years and that commercialization is within site. “By 2018-2019 you will start to see the first really large-scale commercial use of floating platforms,” predicts Bossler.

Putting wind turbines on offshore platforms akin to those developed for the petroleum industry provides a means of exploiting high-quality offshore winds—which are stronger and more consistent than onshore winds—in waters too deep for today’s bottom-fixed foundations. Continue reading

Two REAL Carbon-Capturing Coal Power Plants

The IPCC recently stated that failure to deploy technology to capture carbon emissions from coal would double the cost of stopping climate change. Two coal-fired power plants nearing completion in Saskatchewan and Mississippi will be the first in the world to actually prove the technology, capturing their CO2 emissions and store that bolus of greenhouse gases underground.

You can read about how they will do it in my latest piece for Technology Review. One point dropped from that story bears stressing. Part of what makes the extra cost of carbon capture feasible for these plants is that they have buyers for their CO2: oilfield operators who will use the stuff as a solvent to loosen up petroleum stuck in aging oil wells. That means the CO2 may not be permanently trapped underground warns Sarah Forbes, a carbon capture expert at the Washington-based World Resources Institute.

In Canada, however, expectations are higher according to Robert Watson, CEO of SaskPower, the utility completing the coal-fired power plant in Saskatchewan. Watson told me that the oilfield operator taking his plant’s CO2 must ensure that any CO2 that comes back to the surface with produced oil is recycled back underground: “They’re going to have to assure the government that they can account for all of the CO2 they use all of the time.”

Seattle’s Bullitt Center Shines

Online at Architectural Record:

The designers of Seattle’s Bullitt Center have overachieved. The designers set out to demonstrate that a six-story office building could generate all of the energy it needs, but after one year of operation, it is sending a sizable energy surplus to the local power grid, according to data released by its developer, the Bullitt Foundation.

Consumption is simply far lower than what its architects and engineers projected for the 52,000-square-foot building. Instead of using 16kBtu per square foot—half the energy-use intensity (EUI) of Seattle’s best-performing office building—consumption during its first year was just 10kBtu/sf …

read on