The activities regulations § 70b

§ 70b Measurement of NOx emissions from combustion units

Emissions from conventional turbines, engines, and boilers with a thermal input of 10 MW or more, which are used to cover the energy needs of the facility and any associated facilities during normal operation, shall be measured using the Continuous Emission Monitoring System (CEMS), Predictive Emission Monitoring System (PEMS) or by annual accredited emission measurements performed at representative loads. CEMS or PEMS must be verified at least every three years against accredited emission measurements performed at representative loads on all models of turbines, engines and boilers installed on the facility.
Emissions of NOx from low-NOx turbines with a thermal input of 10 MW or more, which are used to cover the energy needs of the facility and any associated facilities during normal operation, shall be measured by accredited emission measurements at least every three years at representative loads on the individual turbine. The operator shall establish a methodology for quantifying the emissions between the measurement campaigns. If NOx emissions from low-NOx turbines are measured using PEMS, the system shall be verified at least every three years against accredited emission measurements performed at representative loads on the individual turbine. For CEMS and for PEMS that satisfy the technical specifications in SN-CEN / TS 17198: 2018, the verification requirements described in the first subsection apply.
The difference between the NOx concentration measured by CEMS or PEMS and the NOx concentration measured by accredited emission measurements shall not exceed ± 10 % for conventional turbines and ± 10 mg/Nm3 for low-NOx turbines.
Accredited emission measurements as mentioned in the first and second subsection mean emission measurements carried out in accordance with ISO-8178-2:2021, NS-EN 14792:2017, NS-EN 14789:2017 and ISO 12039:2019. The person who carries out the measurements must be accredited under NS-EN-ISO 17025:2017.
Accredited emission measurements to verify PEMS and CEMS must be carried out for the first time by 1st January 2026.
Section last changed: 01 January 2022

The operator must obtain a permit from the Norwegian Environmental Agency for petroleum activities under Chapter 3 of the Pollution Control Act (in Norwegian only). Application for permit under the Pollution Control Act is subject to Chapter 36 of the Pollution Control Regulations (in Norwegian only), and a fee is fixed for the Environmental Agency’s processing relating to applications for permits pursuant to Chapter 39 of the Pollution Control Regulations (in Norwegian only).
The regulations’ general requirements for the petroleum activities on the continental shelf apply to all operators. The permits under the Pollution Control Act will normally contain conditions that are specific and adapted to each activity. Chapter 36 of the Pollution Control Regulations (in Norwegian only) gives further provisions on the processing of permits under the Pollution Control Act. The Norwegian Environment Agency has described further expectations for the content of applications and expected processing time in the Guidelines for applications regarding offshore petroleum activities: https://www.miljodirektoratet.no/ansvarsomrader/forurensning/petroleum/for-naringsliv/soknadsveileder-petroleum/. Chapter 39 of the Pollution Control Regulations (in Norwegian only) gives provisions for fees for work with permits.
Re first subsection:
"Energy needs" refers to the need for electric power, mechanical power, and heat. "Normal operation" means operation for more than 500 hours per calendar year. Regular test-runs and short-term operation to cover energy needs in the event of unforeseen events are nevertheless not considered normal operation, even if the number of operating hours may sometimes exceed 500 per year.
The requirement to carry out accredited emission measurements for turbines and engines on the individual installation includes, but is not limited to, models specified in the right-hand column in the table below.

Turbine supplier

Turbine type

Model

Allison

SAC

Allison 570

General Electrics

SAC

GE LM1600

General Electrics

SAC (GE LM2500 base)

GE LM2500 PE

General Electrics

SAC (GE LM2500 base)

GE LM2500 GE

General Electrics

SAC (GE LM2500 base)

GE LM2500 PC

General Electrics

SAC (GE LM2500+ (plus))

GE LM2500+ PK

General Electrics

SAC (GE LM2500+ (plus))

GE LM2500+ PV

General Electrics

SAC (GE LM2500+ (plus))

GE LM2500+ GK

General Electrics

SAC (GE LM2500+ G4)

GE LM2500+ G4 SAC

General Electrics

SAC

GE LM6000 PA

Ruston

SAC

Ruston Tornado

Siemens (Alstom)

SAC

Alstom EGT

Siemens

SAC

Siemens Avon

Siemens

SAC

Siemens EGT Typhoon

Siemens

SAC

GT-35

Siemens

SAC

Siemens RB211-24GT-RT62

Siemens

SAC

Siemens RB211-G-RT62

Siemens

SAC

Siemens RB211-24G

Siemens

SAC

SGT 100

Siemens

SAC

SGT 200

Siemens

SAC

SGT 500

Solar

SAC

Solar Centaur

Solar

SAC

Solar Mars 90/100

Solar

SAC

Taurus 60S

General Electrics

DLE

GE LM1600

General Electrics

DLE(GE LM2500 base)

GE LM2500 PJ

General Electrics

DLE (GE LM2500 base)

GE LM2500 GJ

General Electrics

DLE (GE LM2500+ (plus))

GE LM2500+ PR

General Electrics

DLE (GE LM2500+ (plus))

GE LM2500+ GR

General Electrics

DLE (GE LM2500+ (plus))

GE LM2500+ GY

General Electrics

DLE (GE LM2500+ G4)

GE LM2500+ G4 DLE

General Electrics

DLE

GE LM6000 PB

General Electrics

DLE

GE LM6000 PD

General Electrics

DLE

GE LM6000 PF

Solar

DLE

Taurus 60

Solar

DLE

Titan 130

MAN B&W

Konvensjonell

8L48/60

Wärtsilä

Konvensjonell

VASA 16V32GD

Wärtsilä

Konvensjonell

W9L32

The requirement to carry out accredited emission measurements per model also applies to boilers.
"Representative loads" refers to the load intervals within which the combustion units on the installation (both those where measurements are done and others) are operated during a normal operating year.
Re second subsection:
In order to be able to report annual NOx emissions from low-NOx turbines without CEMS or PEMS, the operator must establish a methodology for quantifying emissions between measurement campaigns, for example based on measured fuel gas volume and a documented relationship between loads and emission concentrations.
Re third subsection:
If the discrepancy between results of PEMS and accredited measurements exceeds the stipulated requirements, the operator must clarify the reason for the discrepancy and implement corrective measures. The operator must subsequently be able to document how discrepancies have been handled, which corrective measures have been implemented and that the implemented measures have had the desired effect, if necessary, by making new measurements within a reasonable time frame.
The operator should also make corrections for significant systematic errors that are detected, even if the deviation from accredited measurements is less than existing requirements, as well as document how such errors have been followed up.