• Home
  • News
  • DNV GL introduces hybrid power systems for offshore units
  • 2014 May 12 12:47

    DNV GL introduces hybrid power systems for offshore units

    DNV GL is proposing a new hybrid power concept for offshore units using batteries in combination with traditional power generation equipment. The concept has already delivered multiple advantages in the maritime and automotive industries, but has not yet been applied in the O&G industry, the society said in a press release.

    “We are inviting the oil & gas sector to jointly develop a solution for incorporating hybrid power systems in the offshore industry. This will reduce costs, fuel consumption and emissions” says Christian Markussen, subsea business development director at DNV GL Oil & Gas.

    Oil and gas operators are under constant pressure to reduce both cost and emissions - two requirements that are conflicting. An important means of achieving these reductions is by improving energy efficiency, which DNV GL suggests can be done by using a hybrid system. We are therefore launching a Joint Industry Project which aims to capture the lessons learnt from the maritime industry, evaluate the business case and provide practical guidelines for implementation.

    The concept that DNV GL is proposing is similar to that used in the automotive industry, for example in the Toyota Prius. The maritime industry started to adopt this technology five years ago not just because of the environmental benefits, but also because it adds financial value and performance benefits. In the automotive industry there is typically about a 20% fuel saving with the use of a hybrid system, but in some maritime applications there is up to a 40% saving and DNV GL expects to see the same for the O&G industry. Currently there are 17 hybrid ships either in operation or being built, plus one electric ferry. DNV GL studies show that the payback period is typically only about two years for the maritime application.

    “While this hybrid technology has matured in the maritime industry it has not yet been used in the offshore industry.  We think it is now ready to be applied to new offshore developments. Such a solution can combine conventional gas turbine generators, power from shore through a subsea power cable, another nearby offshore facility for power sharing or even renewable energy sources,” says Markussen.

    He explains further that the reduced size of the power generator is a major advantage with a hybrid approach. Today, a conventional offshore facility is typically powered by three gas turbine generator sets, plus a spare one for redundancy. Here the total installed power is dimensioned according to the peak power requirement, but is normally operated at a much lower power level. In addition, the gas turbines are operated at low partial-load in order to have reserve capacity to be ready to react to sudden power demands. This result in low power generation efficiency and thus the fuel consumption and CO2 emissions are higher per unit of power.

    “However, with a hybrid system the power generation becomes optimised for an average load rather than a peak load, and hence the power generation capacity can be reduced. A battery, like those used in maritime vessels, will act as a buffer and supply power when needed or charge up when demand is low,” he clarifies.

    Our initial studies show that hybrid technology can add value to a project in several different ways:

    Fuel consumption and emissions: It can reduce fuel consumption and emissions as much as 40% as described above.

    Green field: For a new build the number of gas turbine generator sets or the size of them can potentially be reduced, since the power generation system can be designed based more on average power loads rather than peak loads. This will reduce CAPEX for the generators. If the number of generators is reduced then the maintenance costs will drop proportionally. Maintenance cost for an offshore gas turbine is about 18% of the turbine CAPEX per year.
    Brown-field: For a brown-field development where more power is required then it is easier to install batteries below deck rather than free up deck space for additional generators. Top side modification is very expensive and results in extended production shut-down. The battery can be modularised for easier handling and installation below deck

    Deck-space: If fewer generators are installed then this will free up valuable deck-space that can be used for other purposes or potentially reduce the size of the facility. On a typical pre-salt FPSO with 75 MW of installed power, the power generation equipment takes up 10-15% of the available deck space.
    Performance: Batteries can deliver instant power compared to a gas generator which needs time to spin up when increasing the load. This is very important in dynamic applications such as dynamic positioning systems or heave compensated lifting systems.
    Energy harvesting: The batteries allow energy to be stored which can be used to recover energy from, for example, electric active heave drawworks used for drilling or cranes. Today, this energy is burned off as heat

    Reliability: Since the power generators will run at much steadier and ideal loads, this has a positive effect on the reliability of this equipment, thus reducing unplanned maintenance.

    About DNV GL

    After a merger on 12 September 2013, DNV and GL have formed DNV GL, the world’s largest ship and offshore classification society, the leading technical advisor to the global oil and gas industry, and a leading expert for the energy value chain including renewables and energy efficiency. DNV GL has also taken a position as one of the top three certification bodies in the world.

2022 January 24

13:21 Loko-Bank shareholder increased his share in FESCO to 26.52%
13:07 Royal Dutch Shell plc changes its name to Shell plc
12:44 FESCO increases number of transit container trains from CPV almost twice in 2021
12:23 EdgeTech rolls out the 6205s2 Swath Bathymetry & Side Scan Sonar System
12:18 PGS secures Northern Lights CO2 storage acquisition contract
11:52 Maersk Drilling secures 21-month contract with TotalEnergies
11:17 Second episode of a creative multimedia project named The Ecologist was launched in cooperation with Van Oord
10:49 Heerema announces contract with McDermott for Saudi Aramco’s Marjan Increment Program
10:42 Eastern Shipbuilding completes major infrastructure improvement project to support OPC program
09:28 Crude oil prices rise as demand increases
09:11 Baltic Dry Index as of January 21
08:37 MABUX: No firm trend on Global bunker market on Jan 24

2022 January 23

14:29 Record figures in Polish ports
13:52 Coast Guard to close southern Green Bay for commercial traffic
12:36 CMHI shipyard hosts a keel-laying ceremony for Ulstein designed expedition cruise vessel ‘Ocean Albatros’
11:47 SGMF releases updated version of LNG as a marine fuel – Safety and Operational Guidelines – Bunkering'
11:08 James Fisher Renewables secures high voltage safety management commissioning contract from Iberdrola’s Baltic Eagle offshore win
10:57 BW Ideol secures close to 1GW of offshore floating wind acreage in ScotWind leasing round
09:51 AIDA named Top Employer again

2022 January 22

14:06 Crowley names Marcus Jadotte as Senior VP, Government Relations
13:29 Kongsberg Digital joins the NorthWind project to develop digital twin technology for offshore wind
12:41 New year boost for MYCRANE as four lifting experts join the team
12:07 Mitsui O.S.K. Lines, Ltd. and Bombora Wave Power strengthen their collaboration through an investment
11:34 Carnival Cruise Line adding more embarkation enhancements as it commits to current protocols for the foreseeable future
10:54 Indian Register of Shipping strengthens focus on safety of Inland Waterways

2022 January 21

19:15 PortNews’ week updates and insights summary
18:20 More than 600 boxships stay off ports waiting for berth space, Seaexplorer disruption indicator shows
18:07 Green Innovation Fund adopts joint project on “Mass-production and Cost Reduction of Floating Offshore Wind Installation”
17:44 The new Stena Baltica has debuted on Stena Line’s Baltic Sea route from Ventspils to Nynäshamn
17:16 Port of Los Angeles breaks cargo record in 2021
17:06 Finnlines strengthens Germany-Sweden route with a fourth ship
16:36 Maersk opens its logistics center for South Western Europe at port of Barcelona
16:03 Dublin Port sees a small reduction in volumes in 2021
15:24 Kongsberg Digital joins the NorthWind project to develop digital twin technology for offshore wind
14:03 ClassNK issues Approval in Principle for ammonia-fueled Panamax bulk carrier developed by Planning and Design Center for Greener Ships (GSC)
14:02 TGE Marine announces completion of largest LNG Bi-Lobe Type C Tanks
13:23 Samskip adds 150 new sustainable reefer containers to its fleet
13:01 Icebreakers remain busy assisting shipping of the Gulf of Finland eastern part
12:13 Freight volumes increase at the Port of Gothenburg in 2021
12:12 Nippon Paint Marine’s new fastar antifouling earmarked for Cosco Shipping VLCC fleet
11:42 RZD invested heavily in its rolling stock upgrade in 2021
11:31 DP World launches a premium barge service between the Upper Rhine region and Rotterdam World Gateway
11:03 Israel orders three new submarines from thyssenkrupp Marine Systems
10:31 Port of Oakland import volume hit new record in 2021
10:11 Crude oil prices drop on US oil reserves growth
09:32 MABUX: Global bunker prices may slide down on Jan. 21
09:21 Baltic Dry Index as of Jan 20

2022 January 20

18:35 EuroDry announces agreement to acquire a 2014-built Supramax bulker
18:05 Valaris announces floater contract awards
17:43 Alfa Laval experiences increased demand for solutions related to LPG as fuel
17:26 Throughput of Chinese sea and river ports in 2021 climbed by 6.8% YoY
17:15 The U.S. Army gets $22.81 billion in supplemental funding of studies, projects and programs
17:05 Sanmar Shipyards delivers fourth powerful compact tug to SAAM Towage
16:50 Cargo traffic on IWW of Russia in 2021 rose by 1.2% to 110.3 million tonnes
16:35 Uber Boat by Thames Clippers builds the UK’s first hybrid high speed passenger ferries
16:15 American Cruise Lines unveils Project Blue
16:05 TGE Marine announces the completion of the tank building phase for two large LNG cargo tanks
15:31 Hafnia plans to acquire 12 modern LR1 tankers
15:25 Holland Shipyards Group develops new tug EDDY 24-50 E
15:05 ZIM announces new chartering agreement for three 7,000 TEU LNG dual-fuel container vessels