Outcomes
The trial was embraced by the catering crew and they took ownership of the operation and management of the hybrid system. They appreciated the importance of the trial as a potential means of reducing emissions and were pro-active in finding solutions to logistics issues and providing feedback on the operation of the trial.
On average, the generator only ran the equivalent of 3.5 hours on four occasions each week to charge the battery. The battery provided power to the catering truck and fridges 24/7. The generator consumed about 10 litres per hour when it was running. It is estimated that it was using an average of about 150 litres a week charging the hybrid battery. If the generator had been powering the catering truck and fridge directly it is estimated that it would have consumed about 400 litres per week.
This saving on fuel amounts to about 750 litres, which would have a cost of about €703.37 if using mineral diesel, or a cost of €997.76 if using HVO. The emissions reduction is equivalent to 2.32 T/CO2e if using mineral diesel and 0.29 T/CO2e if using HVO.
It should be noted that the fuel usage is based on estimates as there were difficulties in getting consistent reports of actual fuel used by each of the four generators used on the production. The estimates are reasonably accurate and marry with expected outcomes based on periods when accurate data was obtained.
There was a requirement for an extra vehicle movement to tow the battery to each new Unit Base where normally there would only be a need to move the generator. The production moved Unit Base 8 times during this trial. The additional emissions from these vehicle movements has not been calculated.
Having the battery unit to provide power enabled more flexibility around the logistics of moving the Unit Base. The catering generator was typically moved first with the catering truck, and the battery unit stayed at the initial Unit Base to power the set table and ancillaries. On some occasions the facilities team were able to move their generator to the new Unit Base before wrap and power their remaining vehicles and equipment, that were still required at the initial Unit Base, from the battery unit. This gave them more flexibility when organising the move and helped shorten their working day.
Costings
Supplier - Sunbelt Rentals
1x Temporary power package to include the following:
- Towable diesel silent generator.
- Towable battery storage unit.
- Interconnecting power cables and comms cables.
- Distribution to provide min 2 x 32a 240v supplies & 3 x 16a 240v supplies.
- Data collection and analysis including load and fuel usage.
Rental price per week for above package: €775.00 x 3 = €2,325.00
Deliver all equipment to Monaghan on 27th April: €250.00
Collect all equipment from Caledon on 17th May: €250.00
Engineer to attend site on delivery/setup/training: €150.00
Supplier – Out Of The Blue Catering
Moving the additional piece of equipment between Unit Bases - 8 x moves @€90 = €720.00
Total Gross Cost = €3,695.00
Less cost of standard diesel generator (€200 x 8 weeks) = €600.00
Total cost for Measure 1 = €3,095.00
Recommendations
The hybrid battery system reduces generator run-time by between 60% and 90% across a full week, depending on how fridges are powered at night and at weekends. When the generator is fuelled with HVO this yields a combined emissions reduction of the order of 95-99%.
It is recommended that future trials of the hybrid system be designed to collect more accurate data around fuel use. Future trials should also be designed to compare different generator types/sizes, and there should be back-to-back trials of the hybrid system vs the generator on its own in order to get really good apples:apples data about the actual fuel savings.
It is recommended that a roadmap be developed to make the use of hybrid batteries mandatory for all catering departments on film and TV productions that are in receipt of Section 481 funding over the next 2 to 3 years. This requirement could be expressed in terms of a maximum weekly carbon footprint for power so as not to exclude any other power options that may also reach the same standard (such as mains power from a 100% renewable tariff). Having such a roadmap would enable equipment providers to plan the upgrade of their fleet to meet the anticipated demand for this equipment and to develop innovative approaches that can address issues like the requirement for additional vehicle journeys when moving Unit Base.
It is recommended that in the interim Screen Ireland should make the use of hybrid batteries mandatory for all catering departments on productions funded by Screen Ireland which have a Sustainability Advisor. This will enable catering providers to gain experience of using the hybrid system in an environment where they have technical and logistics support available from the Sustainability Advisor on the ground, and it will provide market demand for equipment providers to invest in hybrid equipment for their fleet.
It is recommended that Screen Ireland convene an Industry working group to look at the technical and logistics aspects involved in using hybrid batteries to power Unit Bases. Unit bases have a much larger power requirement than catering, they vary in size from job to job, and can also vary in size from day to day. This provides a challenge in terms of understanding and specifying the technical requirements for each job to ensure that there is sufficient power to meet the daily demand while still achieving an acceptable cost:benefit in terms of emissions reduction.