Bulgaria Resource Reserves (2026)

1980

2023

What to know

As of 2023, coal dominated Bulgaria's reserves at 2.4 billion short tons recoverable. It also held 0.015 billion barrels of oil and 0.200 trillion cubic feet of gas. Over the last decade, coal reserves edged lower (-8%). EIA stopped publishing oil and gas proved reserves in 2023; the figures above use the latest archived release, while coal continues to update through 2023.

Key reserves

Oil reserves (2021)

0.01 B bbl

Natural gas reserves (2021)

0.20 TCF

Coal reserves (2023)

2.4 B ST

Key terms

Proved reserves: — Quantities of crude oil or natural gas that geological and engineering data demonstrate with reasonable certainty are recoverable under existing economic and operating conditions.
Recoverable reserves: — Coal that can be technically and economically extracted with current mining methods at current prices. Excludes inaccessible deposits.
Billion barrels (B bbl): — Unit for oil reserves. One barrel equals 42 US gallons or about 159 litres.
Trillion cubic feet (TCF): — Unit for natural gas reserves. One TCF is roughly 28.3 billion cubic metres.
Million short tons (M ST): — Unit for coal reserves. One short ton equals 2,000 lb or 907 kg.

Crude oil proved reserves

In 2021, Bulgaria had 0.015 billion barrels of proved crude oil reserves. Over the prior decade, those reserves held roughly steady.

Natural gas proved reserves

In 2021, Bulgaria held 0.200 trillion cubic feet of proved natural gas reserves. Reserves held roughly steady over the prior decade.

Coal recoverable reserves

As of 2023, Bulgaria's recoverable coal reserves totaled 2.4 billion short tons. That edged lower compared with a decade earlier (-8%).

The bottom line

Bulgaria's reserve base was dominated by coal, the most carbon-intensive fossil fuel by energy content.

Source: U.S. Energy Information Administration · Updated June 2026

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Romania

Greece

Serbia

North Macedonia

What to know

Key reserves

Crude oil proved reserves

Natural gas proved reserves

Coal recoverable reserves

The bottom line

Türkiye

Romania

Greece

Serbia

North Macedonia

What to know

Key reserves

Crude oil proved reserves

Natural gas proved reserves

Coal recoverable reserves

The bottom line