electricity grid

Micropower is smarter military strategy

This post from Tom Grant at his excellent blog Arms & Influence reinforces the point I (channeling Amory Lovins) made in this post, namely: The centralized power grid in Iraq is intrinsically vulnerable to terrorist attack, thereby crippling our efforts to create some measure of security and civil society. Our determination to rebuild it, rather […]

Economist stuff

Two short articles of interest in The Economist. One describes the nascent attempts to conceive and build a network of high-voltage DC power lines across Europe, which would enable wind and solar to play the role of baseload power. The other is about compressed-air storage. This is nifty, but confusing: Meanwhile, General Compression, a small […]

No surprises here, please

The electricity grid doesn't like surprises. Sudden voltage spikes or sags do not a healthy grid make. So proponents of large-scale solar and wind are working to create tools to smooth over volatility issues, so these generating resources can be integrated seamlessly onto the grid. If we're going to be in a position to rely on more solar and wind power and use these to replace significant amounts of power generated from coal, the grid planning and dispatch issues must be addressed.

Which brings us to yesterday's announcement by Tucson Electric Power (TEP) that they have received a $100,000 federal grant to study the problem as it relates specifically to solar power. Under the grant, they will "evaluate how effectively solar energy systems can replace traditional utility generating resources."

TEP will also evaluate "the true costs and benefits" of the almost 400 photovoltaic (PV) systems their customers have already installed in their service area through their SunShare program.

Read more here: "TEP Wins Federal Grant to Evaluate Solar Energy Systems."

Information is power

The day is sweltering, air conditioners are cranked up, and the power grid is straining to meet demand. Today is a "needle peak" day -- on the annual power demand chart, it shows up as a spike. Out of the year's 8,760 hours, needle peaks will occupy 200 hours or less. An extreme day like this is why the grid maintains roughly twice as much power generating and transmission capacity as it uses on an average day. Even though power plants and lines are idle most of the year, this costly overbuilding is needed to cover all contingencies. The grid is built to be there "just in case."

But what if another power resource were available that could dramatically reduce that peak demand, one that involved generating and transmitting no power at all? No, this isn't some weird "zero energy" thing. The paradoxical sounding resource I'm talking about is already in use. It's the demand, also known as the load, itself. The basic idea is that the grid can meet overall needs not only by supplying power, but by adjusting power use. The word for this is demand response, and it's a fundamental aspect of the smart grid.

A shock absorber for the grid to enhance efficiency, reliability, and security

In their July 16th piece on solar energy technology in The New York Times, Andrew Revkin and Matthew Wald wrote that, "With more research, the solar thermal method might allow for storing energy. Currently, all solar power is hampered by a lack of storage capability." They are certainly right. In fact, a lack of storage capacity hampers a lot of things.

While there's been a lot of talk about coupling energy storage to solar (and wind) power, there are additional reasons for addressing our lack of storage capability. In fact, storage technologies can act as a "shock absorber" for the whole grid and can help address some of the key challenges facing the industry, including efficiency, reliability, and security. Simply put, energy storage is good for the grid.

Google.org funds V2G demonstration projects

Sweet mama! Google.org is going to give vehicle-to-grid technology a much-needed boost, to the tune of $10 million. The company is going to modify six cars, a mix of Toyota Priuses and Ford Escape hybrids, with batteries that can draw juice from the grid and feed juice back in. The promise of this technology is […]

On smart grids

My last post made the points that:

• Long-distance transmission lines tying different climate zones together reduce storage needs to a few hours capacity, by ensuring that most of the time when one machine is not producing, another is.


• The least expensive and most ecologically sound way to store electricity on the particular scale needed is with closed-cycle, lined, modular pumped storage that recirculates the same water over and over again, and thus does not draw on rivers, lakes, or other natural watercourses.

However a grid must not only be able to meet baseload (the part of demand that is the same 24 hours a day) plus daily peaks. It also has to deal with seasonal peaks as well. After all, in cooling climates (say Houston) electric demand will peak at a much higher rate in the summer than the winter. Similarly in a heating climate (say New England, Toronto, or Glasgow), demand will peak much more in the winter than the summer.

The same extended grid that can help smooth out supply can also help smooth out demand. If we have a grid that extends 3,000-5,000 kilometers across multiple climate zones, you can connect heating and cooling climates so that summer and winter peaks vary less.

Why the Smart Grid is important

It's the world's largest machine -- the interconnected network of power plants, transmission towers, substations, poles, and wires that make up the power grid. When you flip the switch you expect the juice to flow and don't have much reason to think about it, except during the occasional blackout. Power engineers and energy wonks might get passionate about the grid, but for most people it's just a background fact of life.

It's time to bring the grid into the foreground, because it positions at the exact center of the world's most crucial issue, global climate change. The power grid is the source of one-third of U.S. global warming emissions. Unless we clean it up we cannot avert severe climate change. The grid is also the key to electrifying transportation and making more effective use of heat generated for buildings and industry, source of the vast bulk of remaining emissions. The grid can be the ultimate climate saver.

But today's power grid cannot do it. A system built on central generating stations, little changed from the first power grids deployed in the late 1800s, lacks flexibility and smarts. We need a new grid capable of networking millions of distributed energy devices such as solar panels, wind turbines, electric vehicles, and smart appliances. We need an internet of energy that employs the latest in digital technologies. We need a Smart Grid.

Massachusetts is going to blow

The electrical grid in Massachusetts is getting ready to blow: Documents obtained by the Herald show more than 12,000 transformers from Attleboro to Ayer are operating at above 200 percent capacity, with some as high as 900 percent over design standards. Union officials, who last night reached an agreement in contract talks with National Grid, […]