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Jamil, U.;  Pearce, J.M. Agrivoltaics in Alberta Canada. Encyclopedia. Available online: https://encyclopedia.pub/entry/39921 (accessed on 19 May 2024).
Jamil U,  Pearce JM. Agrivoltaics in Alberta Canada. Encyclopedia. Available at: https://encyclopedia.pub/entry/39921. Accessed May 19, 2024.
Jamil, Uzair, Joshua M. Pearce. "Agrivoltaics in Alberta Canada" Encyclopedia, https://encyclopedia.pub/entry/39921 (accessed May 19, 2024).
Jamil, U., & Pearce, J.M. (2023, January 09). Agrivoltaics in Alberta Canada. In Encyclopedia. https://encyclopedia.pub/entry/39921
Jamil, Uzair and Joshua M. Pearce. "Agrivoltaics in Alberta Canada." Encyclopedia. Web. 09 January, 2023.
Agrivoltaics in Alberta Canada
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This entry is adapted from the peer-reviewed paper 10.3390/en16010053

As Alberta increases conventional solar power generation, land-use conflicts with agriculture increase. A solution that enables low-carbon electricity generation and continued (in some cases, increased) agricultural output is the co-locating of solar photovoltaics (PV) and agriculture: agrivoltaics.

agriculture agrivoltaic Canada energy policy

1. Introduction

Consistent solar photovoltaic (PV) system cost decreases [1][2] are largely responsible for the fact that solar electricity, which is a renewable energy source, is often the least costly electricity source globally [3][4]. Even in harsher northern environments, such as those found in Canada, grid-connected solar PV systems are already past grid-parity, with solar projects in Alberta being proposed at CAD$47/MWh and power purchase agreements (PPAs) with renewable energy credits (RECs) attached being contracted for less than CAD$70/MWh [5]. It should be noted that these values are generation costs and not retail electric rates that include transmission and distribution costs that are measured per kWh and are normally 3–4 times higher. The return on investment (ROI) of installing PV systems generally varies by province and utility [6]. Surprisingly, PV costs have declined to the point that they can be used to subsidize heat pumps to enable profitable electrification of gas-based heating in Canada [7]. These cost-related issues have ensured PV electricity production in Canada continues to grow, although this growth must be put in context. Solar still makes up less than 1% of electricity generation [6].
This Canadian PV growth is good for the local, national, and global environment as solar PV is a well-established sustainable energy source [8]. PV is a net energy producer, which means the embodied energy in PV production (the invested energy in its production) is made up for during operation many times over its 25 or 30-year lifetime under warranty [9]. The energy payback time values only become better as the energy conversion efficiency of all the major commercial and precommercial PV types increase [10]. Today, PV energy payback times are less than a single year [11]. As PV costs have declined, more PV systems have been installed, and large surface areas are needed to power high-population-density cities, which are normally supplied in large PV tracts located in rural agricultural areas [12]. City dwelling has become dominant globally [13]. This has also occurred in Canada, with the four largest urban regions in Canada (the Calgary-Edmonton corridor, Southern Vancouver Island, Lower Mainland, and the Extended Golden Horseshoe in Ontario) housing more than half (51%) of the Canadian population [14]. Similar to wind power siting conflicts [15][16], siting conflicts are increasingly becoming a barrier to large-scale PV, primarily because of the potential interference with agricultural production [17][18] and the public’s negative perception of this [19][20][21]. Land-use conflicts are expected to increase as the population increases (1.15%/year) [22] and the need for food production must increase accordingly [23]. Both historical and current programs to convert crop land to energy production (with the most popular method being crops used for ethanol fuel production) had detrimental effects of increasing both global food costs and world hunger [24][25][26]. Canada is dealing with these issues on a smaller scale as the population growth rate is currently 0.86%/year [27] and urban growth encroaches on agricultural land. Fortunately, a long and rapidly increasing list of studies show that it is possible to have large-scale solar PV growth while protecting agricultural production using the innovation of agrivoltaics. Agrivoltaics is the strategic co-development of land for both solar PV electrical generation and agricultural production [28][29][30][31][32][33].

2. Agrivoltaics Background

Agrivoltaics is a symbiotic system that overall provides fifteen potential services summarized in Figure 1. Of the fifteen benefits of agrivoltaics, the first two are easy to understand as PV systems generate renewable electricity and this electricity offsets fossil fuel electricity production that in turn decreases greenhouse gas (GHG) emissions [34]. The reduced GHG emissions thus help alleviate global climate change and the concomitant adverse effects on the environment and the economy [35]. In addition, a common misperception is that shaded crops from solar panels would reduce crop productivity, but less clearly intuitively, there are now many studies that show agrivoltaics increases crop yield for a wide variety of crops [36][37], while if shading is too much they can decrease [38]. For example, crop yield increased for peppers in the U.S. [39]. Investigations in Japan revealed augmented production of sweet corn in agrivoltaics applications [40]. There is even evidence of enhanced output of grain crops when farmed with solar PV systems [41]. Land-use efficiency increases when PV-generated electricity is added to crop production for a farm, particularly when crop yields increase [41]. This nonintuitive result is possible because agrivoltaics arrays create microclimates beneath the PV modules that alter air temperature, relative humidity, wind speed and direction, and soil moisture [42].
Figure 1. Services provided by agrivoltaics are: renewable electricity generation, decreased greenhouse gas emissions, reduced climate change, increased crop yield, plant protection from excess solar energy, plant protection from inclement weather such as hail, water conservation, agricultural employment, local food, improved health from pollution reduction increased revenue for farmers, a hedge against inflation, the potential to produce nitrogen fertilizer on farm, on farm production of renewable fuels such as anhydrous ammonia or hydrogen, and electricity for EV charging for on- or off-farm use.
This microclimate can be beneficial to crops because the PV protects crops from excess solar energy and inclement weather such as hail or high winds, while also improving PV performance because of lower operating temperatures created by the crops underneath the panels [29][39][43]. Remarkably, a study by Mow et al., showed that agrivoltaics has the potential to increase global land productivity by 35–73% [44]. PV systems designed specifically to be agrivoltaics also minimize agricultural displacement for energy [33][44][45]. In addition to the benefits for the PV array and the crops, agrivoltaics also can benefit water systems as it enables more efficient use of water for farming and thus provides water conservation [46][47][48][49]. PV can also be used to power drip irrigation [50] and vertical growing [51], which uses a fraction of the water of field-based crops. Unlike conventional solar farms that eliminate agricultural employment when they are installed on agricultural land, taking it out of production, agrivoltaics maintains agricultural employment and the farmers provide local food along with all the benefits of reducing food miles and providing fresh food [52][53][54]. Fresh food has health benefits, but agrivoltaics, because it can offset fossil fuel pollution that is also linked to health problems [55], and also can improve human health and even prevent premature deaths [56]. Thus, agrivoltaics provides two mechanisms to benefit human health. Reduction in pollution is primarily attributed to (Scope 1) minimizing emissions related to products produced remotely and brought onto farms for crop production purposes (i.e., fuel, electricity, and fertilizers), (Scope 2) minimizing emissions generated during farming operations, particularly if electric vehicles (EV) and processing are used, and (Scope 3) minimizing emissions related to transportation of produce from farmland (again being used for EVs). In addition, both the increased solar energy production and the increased land-use efficiency have an economic value and thus increase the revenue for a given acre [57]. In addition, because PV is a capital asset that generates value that increases with inflation, it can be used as an inflation hedge during times of high inflation (e.g., 2021 and 2022) [58]. Lastly, agrivoltaics has the potential to be used for on-farm production of nitrogen fertilizer [59], renewable fuels such as anhydrous ammonia [60] or hydrogen [61][62][63], or for electricity for EV charging for on- or off-farm use.
Agrivoltaics is available at all scales. Normally, agrivoltaics is deployed at large scales, but even for the home gardener, parametric open-source cold-frame agrivoltaic systems (POSCAS) have been developed [64]. Agrivoltaics also works with different levels of shade tolerant crops. Full array density PV modules are beneficial for shade tolerant crops, while half or three-fourth array density PV is beneficial for shade intolerant crops [64]. Considering crop performance, east-west-facing vertical bifacial solar panels can be the preferred fixed tilting scheme to be employed for agrivoltaics applications [65]. For bifacial PV modules installed in agrivoltaics applications, increased irradiance and bifacial gain is observed by elevating the height of PV arrays [66]. This also results in convenience of operation for conventional agricultural machinery. Moreover, increasing row spacing reduces electrical output per unit area, though, this increased ground irradiation as compared to closer spacing that has a higher shading percent of the ground [66]. South-facing topologies are conducive for cultivation during summer for farming shade-tolerant crops, whereas east-west vertical arrays are beneficial during non-summer seasons, and hence, advantageous for permanent crops (e.g., species that are harvested over many seasons, such as grapes) [66].
Agrivoltaics has been demonstrated in Canada such as in the Arnprio tri-part agrivoltaics that consists of a monarch butterfly conservation subproject, a bee and honey production subproject, and a solar grazing and natural weed cutting subproject [67]. Currently, most Canadian agrivoltaics systems are made up of conventional solar PV farms that are also used for grazing sheep. This does have positive benefits for both the sheep (i.e., both thermal protection [68] and more importantly, higher-quality grazing areas [69]), but also the PV systems (i.e., reduced costs for weed abatement) and when combined, the global environment [70]. These uses are considered agrivoltaics, but they are not the highest value benefits seen in Figure 1, nor are they the greatest land-use efficiency strategy. Unfortunately, Canada is lagging Europe, Asia, and the U.S. in agrivoltaics. Other countries that make more aggressive use of agrivoltaics would be expected to generate more revenue per acre and win in competitive markets. As the fifth-largest agricultural exporter in the world [71], Canada has considerable revenue at stake to maintain the state-of-the-art in agricultural technology.
Land use policies and legislation have traditionally been a deterrent to wide-scale PV deployment due to the worries of potential adverse impacts on agricultural yield due to the addition of PV [17][18]. Some studies have been clearer in warning that PV development could directly hurt the food supply by replacing arable land with industrial PV and no food production [21][72]. As Canada in general, and Alberta in particular, is already at a strategic disadvantage in the agricultural space without the use of agrivoltaics compared to other nations that are using it, researchers reviewed both the current policies and the policy changes necessary to capitalize on the benefits of using agrivoltaics in Alberta.

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