Scott Demark, President and CEO of Zibi Community Utility, joins thinkenergy to discuss how our relationship with energy is changing. With two decades of expertise in clean energy and sustainable development, Scott suggests reimagining traditional energy applications for heating and cooling. He shares how strategic energy distribution can transform urban environments, specifically how district energy systems optimize energy flow between buildings for a greener future. Listen in. Related links Scott Demark on LinkedIn: https://www.linkedin.com/in/scott-demark-83640473/ Zibi Community Utility: https://zibi.ca/ Markham District Energy Inc: https://www.markhamdistrictenergy.com/ One Planet Living: https://www.bioregional.com/one-planet-living Trevor Freeman on LinkedIn: https://www.linkedin.com/in/trevor-freeman-p-eng-cem-leed-ap-8b612114/ Hydro Ottawa: https://hydroottawa.com/en To subscribe using Apple Podcasts: https://podcasts.apple.com/us/podcast/thinkenergy/id1465129405 To subscribe using Spotify: https://open.spotify.com/show/7wFz7rdR8Gq3f2WOafjxpl https://open.spotify.com/show/7wFz7rdR8Gq3f2WOafjxpl To subscribe on Libsyn: http://thinkenergy.libsyn.com/ --- Subscribe so you don't miss a video: https://www.youtube.com/user/hydroottawalimited Follow along on Instagram: https://www.instagram.com/hydroottawa Stay in the know on Facebook: https://www.facebook.com/HydroOttawa Transcript: Trevor Freeman 00:07 Welcome to thinkenergy, a podcast that dives into the fast, changing world of energy through conversations with industry leaders, innovators and people on the front lines of the energy transition. Join me, Trevor Freeman, as I explore the traditional, unconventional and up and coming facets of the energy industry. If you have any thoughts, feedback or ideas for topics we should cover, please reach out to us at thinkenergy@hydroottawa.com Speaker 1 00:29 Hi everyone. Welcome back. One of the overarching aspects of the energy transition that we have talked about several times on this show is the need to change our relationship with energy, to rethink the standard way of doing things when it comes to heating and cooling and transportation, etc. This change is being driven by our need to decarbonize and by the ongoing evolution and improvement of technology. More things are becoming available to us as technology improves on the decarbonization front, we know that electrification, which is switching from fossil fuel combustions to electricity for things like space and water heating vehicles, etc, is one of the most effective strategies. But in order to switch out all the end uses to an electric option, so swapping out furnaces and boilers for heat pumps or electric boilers, switching all gas cars to EVs, etc. In order to do that in a way that is affordable and efficient and can be supported by our electricity grid, we need to think about multi strategy approaches, so we can't just continue to have this one way power grid where every home, every business, every warehouse or office tower satisfies all of its energy needs all the time directly from the grid with no adaptability. That isn't the best approach. It's not going to be affordable or efficient. We're not going to be able to do it fast enough. The multi strategy approach takes into account things like distributed energy resources, so solar and storage, etc, which we've talked about many times on this show, but it also includes approaches like district energy. So, district energy is rethinking how energy flows between adjacent buildings, looking for opportunities to capture excess energy or heat from one source and use that to support another. And that is the focus of today's conversation. To help us dive into this topic, I'm really happy to welcome Scott Demark to the show. Scott has been a champion of sustainability, clean energy solutions and energy efficiency in the Ottawa real estate and development industry for over 20 years now, he has overseen many high-performance development projects and was one of the driving forces behind the Zibi development in downtown Ottawa, and most applicable for today's conversation the renewable district energy system that provides heating and cooling to the Zibi site. Scott is the president and CEO of the Zibi community utility, as well as a partner at Thea partners. Scott Demark, welcome to the show. Scott Demark 03:15 Thanks. Nice to see you. Trevor, Trevor Freeman 03:17 So, Scott, why don't we start with definitions are always a good place to start. So, when we talk about a district energy system, give us a high-level overview of what exactly that means. Scott Demark 03:27 Sure, a district energy system is, is simply the connection, or interconnection of thermal energy sources, thermal energy sinks. And so really, in practical terms. It means, instead of buildings having their own furnace and cooling system, buildings connect to a hydronic loop. A hydronic loop is just pipes filled with water, and then the heat or the cooling is made somewhere else, and that heat or lack of heat cooling is in a pipe. They push the pipe to the building, and then the pipe extracts the heat or rejects the heat to that loop. And so it's simply an interconnection of us as sources and sinks for federal energy. Trevor Freeman 04:14 And I guess one of the important concepts here is that buildings often create heat, not just through a furnace or not just through the things that are meant to create heat, but, you know, server racks, computer server racks, generate a lot of heat, and that heat has to go somewhere. So oftentimes we're cooling buildings to remove heat that's being created in those buildings, and then other buildings nearby need to be heated in order to make that space comfortable. Is that fair to say? Scott Demark 04:42 Yeah, absolutely. Trevor, so, an office building in the city of Ottawa, big old government office building, you'll see a pretty big plume on the roof in the winter time. That's not just kind of the flue gas from a boiler, but rather it is actually chillers are. running inside to make cooling, and they're just selling that heat to the atmosphere, even on the coldest day of the year. So, it's people, you know, people are thermal load. Computers are thermal load, and so is solar gain. You know, January is pretty dark period for us, meaning low angle sun. But by this time in a year, you know, or at the end of February, there's a lot of heat in that sun. So, a glass building absorbs a lot of sun. An office building will need cooling on the sunny side of that building a lot of the time, even in the dead of winter. Trevor Freeman 05:31 Yeah. So, a district system, then, is taking advantage of the fact that heat exists, and we don't necessarily need to either burn fossil fuels or even if it's a, you know, a clean system, we don't have to expend energy to create heat, or create as much heat if we could move that heat around from where it's kind of naturally occurring to where we need it. Scott Demark 05:54 That's right at the very core of a district energy system. You're going to move heat from a place that it's not wanted to a place that it is wanted. And so in our example of the office building, you know, on the February day with the sun shining in and the computers all running, that building's getting rid of heat. But right next door, say there's a 20-story condo. Well, that 20 story condo needs heating and it also needs domestic hot water. So, year-round, domestic hot water represents 30, 35% of the heating load of any residential building, so at all times. So, a district energy system allows you to take that heat away from the office building and give it to the residential building, instead of making the heat and dissipating that heat to the atmosphere in the office building. So, yeah, it's, it's really a way to move, you know, from sources to sinks. That's, that's what a district energy system does well. Trevor Freeman 06:48 So we've kind of touched on this a little bit, but let's dive right into, you know, we talk a lot on the show about the energy transition. This, this push to, one, move away from fossil fuel combustion to meet our energy needs. And two, shifting from a kind of static, centralized energy system like we have right now, big generators, large transmission lines, etc., to more of a two-way flow, distributed energy system. What is the role of district energy systems within that transition. How do they help us get closer to that sort of reality that we talk about? Scott Demark 07:27 I think the biggest way that they help is economies of scale. Okay, so by that, I'll explain that. Imagine there's a lot of technology that's been around a long time that is very scalable to the building level, but most of them are fossil fire. Okay, so the cheapest way to heat a building in Ottawa is to put a gas fired boiler in. That's the cheapest capital cost, first cost, and it's also the cheapest operating cost, is to put a gas boiler in. That industry is well established. There's lots of trades who could do it. There's lots of producers who make the boilers. When you start to try and think about the energy transition and think about what you may do to be different, to be lower carbon, or to be zero carbon, those industries are just starting right. Those industries don't exist. They don't have the same depth, and so they don't have the same cost structure, and often times they don't scale well down to the building. And therefore, a district energy system aggregates a bunch of load, and so you can provide a thermal energy so at scale that becomes affordable. And that is, you know, a very good example of that would be where, you know, you might want to go and recover heat from some process, and we'll talk about Zibi as the example. But if he