● Ambitieuze beleidsdoelen en diverse stimuleringsmaatregelen maken de vraag naar groen gas veel groter dan het aanbod is.● Zonder prijsdempende maatregelen en innovatie in de productie van groen gas zal de prijs van groen gas fors stijgen tot 2030.
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In het hoofdstuk wordt ingegaan op de innovaties in de Europese gassector, met een speciale focus op de invoeding van groen gas (ook wel biomethaan) in het aardgassysteem. Er wordt een algemeen juridisch kader geschetst en er vindt een rechtsvergelijking plaats van de nationale rechtsordes aangaande Duitsland, Denemarken en Nederland.
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Martien Visser is er klip en klaar over: transport, distributie en opslag van gas is vele malen goedkoper dan van elektriciteit of warmte.
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For centuries, natural gas has been one of humanity’s main energy sources. The gas sector is still heavily reliant on natural gas production; however, as natural gas fields contain only a finite quantity of gas, its continued extraction is leading to the resource’s depletion. Furthermore, natural gas production has become a subject of debate, with many considering continued utilisation incompatible with the achievement of international and European climate goals. The need for alternative gases that are less damaging to the environment is becoming increasingly evident. Biomethane has shown itself to be a reliable alternative to natural gas, and if sourced and manufactured responsibly results in no new CO2 emissions. Another alternative, hydrogen, can, through the process of methanisation, be converted into synthetic natural gas (SNG). This chapter discusses the legal aspects of the production and use of biomethane, hydrogen and SNG.
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Groen Gas Hub Salland is een experimenteel en innovatief project. De beleidscontext van dit project laat zich kenmerken door een dynamiek van publieke belangen. Op de eerste plaats is er de liberalisering van de energiesector, die tot gevolg had dat de overheid op afstand van de sector is komen te staan. Daarnaast is er de wens in de samenleving om een duurzame energievoorziening te realiseren. Om aan deze wens tegemoet te komen, is het goed denkbaar dat de overheid haar verantwoordelijkheid neemt door in samenwerking met particulieren innovatieve duurzaamheidsprojecten te starten. Deze beleidscontext roept de vraag op (i) of en (ii) zo ja hoe een Groen Gas Hub in Salland georganiseerd kan worden. In dit rapport staan kritische succesfactoren waarmee bij de organisatie van het initiatief rekening kan worden gehouden. Daarnaast wordt een model gepresenteerd waardoor het mogelijk is om op een systematische en gefaseerde wijze een afweging te maken tussen verschillende organisatorische constructies. Deze afweging is terug te brengen tot een keuze op twee dimensies, namelijk: (i) het type belang en (ii) de schaal van het project. De keuzemogelijkheden op de twee dimensies leiden tot vier organisatievormen. Bij elke vorm hoort een andere verdeling van taken, bevoegdheden en verantwoordelijkheden tussen de verschillende partijen. Van deze organisatievormen is “de op een publiek belang gerichte provinciaal/regionaal georiënteerde organisatie” vooralsnog te prefereren.
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Energy efficiency, greenhouse gas reduction and cost price of a green gas supply chain were evaluated. This supply chain is based on co-digestion of dairy cattle manure and maize, biogas upgrading and injection into a distribution gas grid. A defined reference scenario reflects the current state of practice, assuming that input energy is from fossil origin. Possible improvements of this reference scenario were investigated. For this analysis two new definitions for energy input-output ratio were introduced; one based on input of primary energy from all origin, and one related to energy from fossil origin only. Switching from fossil to green electricity significantly improves the energy efficiency (both definitions) and greenhouse gas reduction. Preventing methane leakage during digestion and upgrading, and re-using heat within the supply chain show smaller improvements on these parameters as well as on cost price. A greenhouse gas reduction of more than 80 % is possible with current technology. To meet this high sustainability level, multiple improvement options will have to be implemented in the green gas supply chain. This will result in a modest decrease of the green gas cost price.
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One of the issues concerning the replacement of natural gas by green gas is the seasonal pattern of the gas demand. When constant production is assumed, this may limit the injected quantity of green gas into a gas grid to the level of the minimum gas demand in summer. A procedure was proposed to increase thegas demand coverage in a geographical region, i.e., the extent to which natural gas demand is replaced by green gas. This was done by modeling flexibility into farm-scale green gas supply chains. The procedure comprises two steps. In the first step, the types and number of green gas production units are determined,based on a desired gas demand coverage. The production types comprise time-varying biogas production, non-continuous biogas production (only in winter periods with each digester having a specified production time) and constant production including seasonal gas storage. In the second step locations of production units and injection stations are calculated, using mixed integer linear programming with cost price minimization being the objective. Five scenarios were defined with increasing gas demand coverage, representing a possible future development in natural gas replacement. The results show that production locations differ for each scenario, but are connected to a selection of injection stations, at least in the considered geographical region under the assumed preconditions. The cost price is mainly determined by the type of digesters needed. Increasing gas demand coverage does not necessarily mean a much higher cost price.
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Green gas is an attractive option for a local energy transition to combat climate change, notably in rural communities. As local initiatives require local acceptance, the study used a questionnaire methodology to capture opinions and intentions toward green gas in a panel of rural respondents (N = 403) and evaluated the green gas message framing to help improve communication strategies. This survey experiment used four frames in a 2 × 2 setup: an energy value core frame of responsibility for nature versus autonomy and a focus frame emphasizing the collective (i.e., the community) versus the individual (i.e., the household). Our findings highlight that the association with sustainability proves vital for a positive assessment of green gas, but its affordability is an issue. Moderated mediation analysis showed that subjective knowledge moderates between frames and intentions toward green gas: responsibility for nature contributes significantly, but only in the collective focus frame. These results are valuable in creating effective communication strategies about green gas adoption in the future.
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A transparent and comparable understanding of the energy efficiency, carbon footprint, and environmental impacts of renewable resources are required in the decision making and planning process towards a more sustainable energy system. Therefore, a new approach is proposed for measuring the environmental sustainability of anaerobic digestion green gas production pathways. The approach is based on the industrial metabolism concept, and is expanded with three known methods. First, the Material Flow Analysis method is used to simulate the decentralized energy system. Second, the Material and Energy Flow Analysis method is used to determine the direct energy and material requirements. Finally, Life Cycle Analysis is used to calculate the indirect material and energy requirements, including the embodied energy of the components and required maintenance. Complexity will be handled through a modular approach, which allows for the simplification of the green gas production pathway while also allowing for easy modification in order to determine the environmental impacts for specific conditions and scenarios. Temporal dynamics will be introduced in the approach through the use of hourly intervals and yearly scenarios. The environmental sustainability of green gas production is expressed in (Process) Energy Returned on Energy Invested, Carbon Footprint, and EcoPoints. The proposed approach within this article can be used for generating and identifying sustainable solutions. By demanding a clear and structured Material and Energy Flow Analysis of the production pathway and clear expression for energy efficiency and environmental sustainability the analysis or model can become more transparent and therefore easier to interpret and compare. Hence, a clear ruler and measuring technique can aid in the decision making and planning process towards a more sustainable energy system.
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In Europe, green hydrogen and biogas/green gas are considered important renewable energy carriers, besides renewable electricity and heat. Still, incentives proceed slowly, and the feasibility of local green gas is questioned. A supply chain of decentralised green hydrogen production from locally generated electricity (PV or wind) and decentralised green gas production from locally collected biomass and biological power-to-methane technology was analysed and compared to a green hydrogen scenario. We developed a novel method for assessing local options. Meeting the heating demand of households was constrained by the current EU law (RED II) to reduce greenhouse gas (GHG) emissions by 80% relative to fossil (natural) gas. Levelised cost of energy (LCOE) analyses at 80% GHG emission savings indicate that locally produced green gas (LCOE = 24.0 €ct kWh−1) is more attractive for individual citizens than locally produced green hydrogen (LCOE = 43.5 €ct kWh−1). In case higher GHG emission savings are desired, both LCOEs go up. Data indicate an apparent mismatch between heat demand in winter and PV electricity generation in summer. Besides, at the current state of technology, local onshore wind turbines have less GHG emissions than PV panels. Wind turbines may therefore have advantages over PV fields despite the various concerns in society. Our study confirms that biomass availability in a dedicated region is a challenge.
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