TurboTime Podcast: Modular and Low-Head Designs are Trending in Hydropower

In this interview with Scott DeNeale, a Water Resources Engineer at Oak Ridge National Laboratory, we discuss the lab’s current research projects in hydropower and trends such as low-head and modular designs and metal additive manufacturing to manufacture Francis turbines. The lab is working on a lot of exciting work, and even though hydropower has been around for 150 years, DeNeale said there is a lot of opportunity to complement new generation with environmental compatibility.

An interesting fact is that only 3% of the more than 90,000 damns in the United States use hydropower. Why? Listen to find out!

TURBO: Can you tell us a little about Oak Ridge National Lab?

DeNeale: Oak Ridge National Laboratory is the largest multi-program science and technology laboratory in the United States. It's managed by UT Battelle but is owned by the U.S. Department of Energy. As part of my research, I do a lot of work for hydropower. The research and development that I do touch on a lot of different things. We look at grid integration, markets, reliability, performance, hydrology and hydraulics, water management, biodiversity and ecosystem science. We look at technological advancement as well.

TURBO: What recent advancements have you seen in turbomachinery used in hydropower technology and pumped storage hydropower technology?

DeNeale: Conventional hydropower—what we would speak to is the age of the big dams is over, so a lot of what we're looking at is retrofitting existing dams, replacing units, or adding new units to existing dams. And there's an area looking at canals and conduits as well. So, some of the advancements that I've seen are really geared toward the existing infrastructure, which has largely low-head or low-pressure potential. It’s a little bit different design that is used to capture that design point. Another area is modular technologies and standard technologies. Conventionally, a lot of turbines are custom-built, so the ability to have a standard design that could be plug-and-play has been of interest. We've had some research over the past 10 years related to that, working with industry on advancing their concepts as well.

For pumped storage … I would refer you to a report from some of my friends at Argonne National Laboratory. They have done some great documentation of innovations—a lot of it's conceptual for pump storage but some cool innovations there. However, there has been no new pump storage since 2012. And, even with that, that was a very small project. So, since the mid-nineties, there really hasn’t been much of anything in terms of new pump storage, but there is a great demand for it.