Production from Equinor’s important Johan Sverdrup field, which accounts for 755,000 bopd (36% of Norway’s oil production), was shut-in on Monday as a result of a power outage. Production was in the process of being restored on Tuesday.
According to Equinor, the outage was caused by overheating at an electric converter station onshore.
A 2022 BOE post questioned Norway’s push to power offshore platforms with electricity transmitted from shore. This incident reinforces those concerns. Summary:
Most offshore platforms produce sufficient gas to support their power demands
Assuming gas that is not used to power a platform is marketed and consumed elsewhere, the net (global) reduction in CO2 emissions from electrifying offshore platforms is negligible. (Perhaps there is actually a small increase in net emissions given the power required to transport the gas to markets and the emissions associated with onshore power generation).
Offshore power demands are highly variable, especially when drilling operations are being conducted.
Gas turbines are reliable, and capable of responding to variable power demand. Excess generation capacity is typically provided.
Power from shore increases the cost of platform operations and could decrease ultimate recovery of oil and gas resources.
Per NPD, electrification of the shelf will increase electricity prices for onshore consumers and increase the need for onshore facility investment.
Gas turbines or diesel generators are still necessary to satisfy emergency power needs at the platforms.
Long power cables are vulnerable to damage (accidental or intentional), as are onshore power stations.
I hope the investigation of this incident considers some of these broader electrification policy issues.
Equinor diagram: The purple cable shows power from shore to Johan Sverdrup phase 1, established in 2018. The yellow power cable shows power from shore to Johan Sverdrup phase 2 and the Utsira High area solution, from 2022. The orange cable shows power from shore to the Sleipner field centre and connected fields from late 2022. Black cable shows existing power cables at Sleipner field centre and to the Gudrun installation.
Bud's Offshore Energy (BOE) 