Flexible Bioenergy and System Integration

Role of biorefineries in grid balancing

IEA Bioenergy Task 39-Task 44 Joint Workshop, “Role of biofuels production / biorefineries in grid balancing”, 25 November 2020, Virtual

 Due to increasing electrical power production from fluctuating renewable sources like wind and solar, there is an important role for bioenergy to help balance the electricity sector by aiding electrical grid stabilization and supply reliability. On the other hand, surplus electrical power and hydrogen produced therefrom can be used to improve biofuels production and biorefinery processes by enabling increased conversion rates and yields of fuel products, increased biocarbon utilization as well as diversifying the types of fuels and energy products being produced. Several concepts to produce heat, electricity, fuels and other products in single high-efficiency processing plants are under development.

This workshop’s objective was to provide an overview of flexibility options for fuel production-oriented biorefineries and gain insights into concepts and challenges for biorefinery designs that enable more flexible biofuel and biopower production. The workshop also provided a forum for IEA Bioenergy stakeholders to discuss the barriers and success factors to implement emerging grid-flexible biorefinery concepts in energy systems with high shares of renewables as well as to explore potential Task 39-Task 44 future collaborations related to advancing analysis and demonstration of biofuels-producing biorefineries for grid balancing.

Four bioenergy experts, two invited by Task 39 and two by Task 44, gave presentations detailing the current state of the art of multi-product biorefining and describing more grid-flexible biorefinery designs being proposed and investigated to enable better integration of multiproduct biorefineries into electrical grids to improve grid stability, either by exploiting low cost surplus power when it is available or by supplying power to the grid when this is needed.

A key challenge identified and discussed in the workshop is the generally higher costs required to implement biorefinery designs that enable greater grid flexibility. For example, increased costs are required to install additional feedstock handling, power generation or hydrogen production capacities, additional capacities that will then be used to balance the grid only some of the time. Discussions highlighted the need for further research into compelling schemes as well as the potential for industrial symbiosis-oriented plant designs to mitigate cost barriers. For example, the higher cost of provisioning biorefineries for increased grid balancing capability can be avoided or greatly reduced by leveraging existing “stranded” capital or co-locating adjacent to complementary facilities such as wastewater treatment or biogas production plants. It was also noted that stronger policies requiring and incenting industrial symbiosis-oriented planning are needed to stimulate progress in larger-scale demonstration of grid-stabilizing designs that can benefit the greater energy system in addition to increasing biorefinery performance flexibility.

Workshop participants concluded that this is an intriguing area deserving of more investigation and that further analysis and demonstration of grid-flexible biorefinery designs is needed. Participants agreed this area is ripe for future multi-stakeholder and international technical collaborations.

Due to increasing electricity production from fluctuating renewable sources like wind and solar, the role of bioenergy in the electricity sector should be more flexible to aid grid stabilisation and secure supply. On the other hand, surplus power can be used in biofuels production and biorefinery processes to increase conversion rates and fuels output. Several concepts to produce heat, electricity, fuels and other products in single high-efficiency processing plants are under development. The aim of this workshop is to provide an overview on the flexibility options, get insights into concepts for more flexible biofuel and biopower production, and discuss the challenges and success factors to implement these concepts in energy systems with high shares of renewables; and to explore potential Task 39-Task 44 collaboration opportunities for the next triennium.

Presentations:

Borregaard – the world’s most advanced biorefinery in operation – a peek into our secrets, Gudbrand Rodsrud, Borregaard AS

Dimensions and options of flexible energetic use ofd biomass, Tilman Schildhauer, Paul Scherrer Institut

Flexible hybrid process for combined production of heat, power and renewable feedstock for refineries, Esa Kurkela, VTT Technical Research Centre of Finland Ltd

SynBioPTx to use synergies of the biobased and powerbased routes, Franziska Müller-Langer, Kati Görsch, Lilli Sophia Röder, DBFZ