The Legal Governance of Oil and Gas in Europe: An Indicator Analysis of the Implementation of the Hydrocarbons Directive

: Hydrocarbons are traditional subjects to European Union (EU) law (“acquis communitaire”). A short historical review reveals that quasi all aspects of upstream and downstream segments are covered by the legislation. The results of applied information extraction and elaborated quantitative analysis indicate that the intensity of legislation making correlates with global drivers such as oil price booms, and technology developments such as extraction of unconventional hydrocarbons by hydraulic fracturing. A quarter of a century after the Hydrocarbons Directive was published and transposed by Member States (MS), data allow us to make a semi-quantitative assessment on the implementation, the major drivers of governments’ publication activity, and the impact on the oil and gas production. Another speciﬁc relevance of this study is on non-energy minerals management of the EU, whether the introduction of similar competitive bidding rules would induce a greater interest of investors, and the enhanced competition could bring more beneﬁts to the states by the rejuvenation of the critical minerals extractive sector. The preliminary ﬁndings show that in some MS there is a positive correlation between the concession call publication activity and hydrocarbons production. To conﬁrm these conclusions the analysis of an extended dataset including exploration data, investments, and social impacts is needed in order to screen the effect of global market trends, the exhaustion of domestic geological reserves, and the different policy environments.


Introduction
Oil and gas are fossil fuels, non-renewable resources that account for 60-65% of the total final energy consumption and 20-25% of the domestic energy production in the EU (IAE, [1]). MS have sovereignty over fossil fuels and minerals on their territories because most segments of this sector, especially the proprietary decisions on the extraction, are out of the scope of the EU primary legislation, i.e., the Treaty of the Functioning of the EU (TFEU) (Hámor [2], Hámor et al. [3] Hámor-Vidó et al. [4]). In 1994, a progressive piece of EU secondary legislation was published on the rules of hydrocarbons exploration and production (Directive 94/22/EC of the European Parliament and of the Council of 30 May 1994 on the conditions for granting and using authorizations for the prospection, exploration and production of hydrocarbons) (hereinafter: "Hydrocarbons Directive" or "Directive") in order to ensure open and fair competition. The European Commission (EC) monitors the implementation of EU legislation; however, no such report has been published since 1998 (EC [5]), in spite of the obligation of Article 9 that MS shall publish an annual report on the geographical areas opened, authorizations and entities granted, as well as the reserves.
Hydrocarbons' importance is still significant in the EU. Domestic reserves are limited but due to the decarbonization efforts, its criticality is diminishing (Hamor-Vido et al. [4]).
On the contrary, the number of critical minerals more than doubled in nine years (from 14 to 30).
Three policy contexts highlight the importance of this study: (a) the growing interest in exploring domestic unconventional hydrocarbons in Europe induced by the US shale gas boom; (b) the EU non-energy raw materials policy targeting efficient governance tools; and (c) the Energy Union Regulation which is to integrate, amend, replace and withdraw certain obligations contained in sectoral energy and climate legislative acts, including the Hydrocarbons Directive, to ensure a streamlined and integrated approach to the main planning, reporting and monitoring strands.
The technology development at hydraulic fracturing and the revision of the conventional exploration and extraction methods of hydrocarbons brought a major breakthrough in the US energy mix at the turn of the century, known as the "shale gas boom". This success story has not been repeated in Europe yet. The rally for unconventionals reached Europe with a certain delay in 2005-2010 (Tzimas et al. [6]), and almost immediately it generated public opposition (Urbaniak et al. [7]) and political attention. In 2011, France introduced an absolute ban on hydraulic fracturing. Some MS followed this (e.g., Bulgaria); others were supportive (UK, Poland, Ireland), or took a neutral stand-by position (e.g., Germany, Hungary). In 2012, the European Parliament (EP) issued a resolution with numerous recommendations (EP [8]), and later the European Economic and Social Committee acted (EESC [9]). As a follow-up, the EC launched a set of studies (EC [10][11][12][13]; AEA [14]; KPMG [15]; AEA [16]; UBA [17]; Milieu [18]; Amec [19]; Mitchell et al. [20]; Durling et al. [21]) and a public consultation. As an outcome, the EC published a Communication (EC [22]) and a recommendation on the minimum principles for the exploration and production of hydrocarbons (such as shale gas) using high-volume hydraulic fracturing (EC [23]). Its application was reviewed two years later (EC [24]).
The EU Raw Materials Initiative's (EC [25]) scope is on non-energy, non-food primary and secondary raw materials. Its second pillar is to reinforce the sustainable supply from domestic European sources. The European Innovation Partnership (EIP) on Raw Materials (EC [26]) translated the strategic policy framework into actions and mobilized the stakeholder community. The EIP's Strategic Implementation Plan (EIP SIP) (https://ec.europa. eu/growth/sectors/raw-materials/eip/strategic-implementation-plan_en (accessed on 4th October 2021)) in 2013 offered an agenda on research and innovation actions, inter alia, it is calling for setting right framework conditions via streamlined permitting procedures.
In 2014, the Ad Hoc Working Group on "Exchange of best practices in minerals policy and legal framework, information framework, land-use planning and permitting" (Christmann et al. [27]) proposed a provisional list of topics to be regulated at EU level (e.g., through a Commission Decision), such as good governance, stable and predictable legal and regulatory framework, transparency, undistorted market conditions, defining "mineral deposits of public importance", etc. It also proposed mandatory publication of calls with regard to areas open for exploration and extraction of critical minerals, similar to what the Directive introduced. EC [28] published a review of minerals permitting and concluded that there were significant differences among the MS in legislation, permitting practices, involved authorities, procedural details, and fiscal conditions. This study is a review on the implementation of the Directive based on a quantitative assessment of 25 years of publication practices of MS on hydrocarbon exploration and production tenders. The analysis of the national governance covers aspects such as the typology of the calls, the competent authorities, the relevant legislation, and the number and volume of published calls. It also includes the comparison with global market price trends, the effect of technology and policy drivers, as well as the historical trends of EU lawmaking. The study draws conclusions on the impacts of open competition with the ambition that the results could be used in both the energy and non-energy extractive sector. The study does not aim at an analysis of the EU energy policy or recent studies on renewable fuel technologies. These aspects are published in numerous works (e.g., Matláry [29]; Li et al. [30,31]).

Methodology
For the study of the legislation, the authentic EUR-Lex database was queried, and analyzed using text mining techniques, and relevant works (e.g., EC [28]; Hámor [2]; Hámor et al. [3]) were reviewed. EU Community law is often cited as "supranational" law. Primary legislation involves treaties and international conventions. Treaties define the thematic scope of the acquis, the responsibilities of EU institutions and the legislative, executive and juridical procedures. Secondary law is: (a) regulations, directly applicable and binding in all MS; (b) directives, binding as to the objectives to be achieved, while leaving MS the choice of form and tools to be used; and (c) decisions, binding for those to whom they are addressed (https://ec.europa.eu/info/law/law-making-process/ types-eu-law_en (accessed on 4th October 2021)).
MS legislation shows a similar hierarchy. Acts or laws are issued by the National Assemblies (Parliaments), regulations, decrees and orders by the Governments and the Ministers. Regional and local governments also have the right to publish decrees in their sphere of competence. Government agencies may publish orders and guidelines as well, but these less commonly have legal effect.
Union competences are steered by the principles of subsidiarity and proportionality. In areas which do not fall within its exclusive competence, the Union acts only if and in so far as the goals of the proposed action cannot be sufficiently achieved by MS, either at central, regional, and local scale, but can rather, by reason of the level or effects of the proposed action, be better achieved at Union level (TFEU) Art. 5. Under the principle of conferral, the EU acts within the limits of the competences conferred upon it in the TFEU (https://ec.europa.eu/info/law/law-making-process/types-eu-law_en (accessed on 4 October 2021)).
For a quantitative trend analysis, the advanced search functions of the EUR-LEX were used with the "all documents" setting and with the "legal acts" setting, respectively, for all searched words. The former includes all EU documents, the latter covers pieces of law exclusively. The text search function was applied for words "energy", "hydrocarbon" and "oil" AND "gas". The examined period is 1970-2020. This methodology was introduced and tested by Hámor et al. [3] on the EU scale.
According to Article 3 of the Directive, MS publish their concession calls for hydrocarbons in the Official Journal of the European Community. The advanced search engine of EUR-LEX allows downloading of all related documents.
The data on production were extracted from the EUROSTAT database. The oil price curve is based on the average annual OPEC crude oil price (https://www.statista.com/ statistics/262858/change-in-opec-crude-oil-prices-since-1960/ (accessed on 4 October 2021)).
The authors' efforts failed to find public data on the direct investment in the hydrocarbon industry, or any indicators of exploration activities (number of wells, drilled meters, number or length of seismic lines, number of companies, number and size of concession areas, evolution of reserves volumes) which could reflect the trend of upstream activities during the last 25 years in Europe.

Hydrocarbons in the Acquis
In the TFEU, "energy" and "environment" are sectors of "shared competence", meaning that the EU may act but MS cannot so long as the EU is acting ("pre-emption"). The Amsterdam Treaty (1997) implemented a coherent community policy on the environment by adopting the concept of sustainable development: "this policy shall contribute to a pursuit of the objective of prudent and rational utilization of natural resources." The earliest pieces on the environment were on dangerous chemical substances (Appendix A [1]), waste management (Appendix A [4]), and water (Appendix A [6]). In the 20th century the minerals extractive industry was excluded from the scope of environmental directives Hamor [2]; Hamor et al. [3]). The upstream of the hydrocarbons sector, i.e., exploration and extraction, was out of scope (e.g., Waste Framework Directive, Appendix A [4]) but the downstream such as distillation, refining, processing, storage were covered by the Seveso I Directive (Appendix A [7]), and others on minimum stocks of crude oil (Appendix A [2]), on workers safety and health issues (Appendix A [9]), trade, procurement. Since 1972 MS had to report their hydrocarbon production, transport, storage or distribution projects above a certain threshold (Appendix A [3]). In 1990, the whole sector came to the scope of the procurement rules (Appendix A [10]).
At the turn of the century, mainly due to tailings dam failures, the sector was brought to the scope of the environmental legislation, including the Extractive Waste Directive, the Water Framework Directive, the Environmental Impact Assessment Directive, the Industry Emissions Directive, the REACH Regulation on chemicals, the Seveso Directive on industry accidents, to mention a few (Appendix A [24,45,46,[70][71][72]). The Energy Community Treaty was published in 2006 (Decision 2006/500). It provides for the creation of an integrated market in natural gas and electricity in South-East Europe with a stable regulatory and market framework capable of attracting investment in gas networks, power generation and transmission networks, so that Parties have access to the stable supply. It enables the efficient operation of energy markets, including congestion management, cross-border flows, and power exchanges. Later the energy policy developed to a higher level of integration by ensuring supply security via transnational network grids, the promotion of renewable energy and energy efficiency, and the de-carbonization of the energy mix in harmony with global climate agreements.
A complete list of EU legislation on the hydrocarbons sector is provided in the Annex. During the last 20 years, the scope of the environmental acquis covered most environmental compartments, with the exception of soil and subsoil, and major emitting sectors and waste streams (Hámor [2]; Hámor-Vidó et al. [4]).
The US shale gas revolution had not generated prompt precautionary measures at the EU policy making, in spite of the fact that numerous oil and gas companies launched exploratory projects in Poland, Hungary, and the UK. It came into political focus in 2011 when France introduced an absolute ban on hydraulic fracturing. 2012 was earmarked with more studies, bans (e.g., Bulgaria), or supportive positions (UK, Poland, Ireland) and neutral stand-by (e.g., Germany). The EP Resolution was a milestone with 114 statements and recommendations: - The acquis adequately covers this industry; -Robust national regulatory regime is needed; -Environment-friendly processes, etc. should be used; -Importance of transparency and fully consulting the public; -MS should adopt a one-stop-shop approach to permitting and examination of compliance with environmental regulations (incl. mandatory impact assessment); -Mandatory approval of the local authorities affected; -Special plans for water use should accompany any hydraulic fracturing.
As a follow-up, the EC launched a public consultation and published the Recommendation on the minimum principles for the exploration and production of hydrocarbons (such as shale gas) using high-volume hydraulic fracturing (EC [23]). Although the Recommendation is not mandatory, it is expected that those MS which adopt it voluntarily should be in compliance with its regulatory solutions and report on the implementation.
In 2015, a Science and Technology Network was launched, and a Technical Expert Group was established for preparing a best available technique reference document ("BREF") on hydrocarbons exploration and extraction (http://ec.europa.eu/environment/ integration/energy/hc_bref_en.htm (accessed on 4th October 2021)). An IMPEL (EU Association of Environmental Law) project provided an analysis of the acquis and of the participating MS legislation (UK, HU, PL, NL, FR, RO) (Mitchell et al. [20]; Durling et al. [21]). The EC proposed the European Chemicals Agency (ECHA) to make changes in the database of registered chemicals to facilitate information on substances used in hydraulic fracturing.
The above studies conclude that there is no one piece of EU legislation which is specific to unconventional hydrocarbons or hydraulic fracturing. Beyond this general lack, there are uncertainties in interpreting existing pieces. The Strategic Environmental Assessment Directive (Appendix A [28]) requires an assessment of plans and programs, particularly in the areas of energy, industry, waste management, water, transport and land use. Hydrocarbon projects (drilling, production, water discharge, etc.) are listed in its Annex. Recommendation 2014/70/EU invites MS to carry out an assessment before granting licenses that may require the use of high-volume hydraulic fracturing. Reasonable alternatives to the proposed project must also be considered. The Chemicals Regulation (Appendix A [45]) could be more specific with regard to registration and reporting the composition of fracking fluids and drilling muds, and in providing volume thresholds.
The Seveso Directive (Appendix A [72] on industry catastrophes is applied for the sector, including waste management, i.e., drilling mud and fracking fluid disposal in ponds above a certain volume of dangerous substances. It requires operators to have policies preventing major accidents and, in the case of "upper-tier establishments", to produce a safety report and internal emergency plans. The Extractive Waste Directive and its daughter decisions (Appendix A [46,62-66,98]), as well as the Waste Framework Directive and the European Waste Catalogue (Appendix A [26,55]) are applicable for drilling muds and cuts (rock chips), but the coverage of used fracking fluids (incl. proppants) is questioned. If extractive waste transported off-site (e.g., hazardous drilling mud) it may be disposed of at commercial landfills, although it is not a practice in MS. The interpretation of the acquis on naturally occurring radioactive materials (NORM) is unclear.
Oil and gas activities may also be subject to EU nature conservation based on two Directives (Appendix A [14,61]). If a foreseen project may affect a Natura 2000 site in a significant manner, a prior appropriate assessment must be carried out (Hámor et al. [32]). However, the implementation of these provisions could be uneven across MS.
The water legislation (Appendix A [24,48]) focus is mainly on water quality, quantitative issues are less regulated. Article 11 (3.j) is the basis of debates for interpretation: "Member States may also authorise, specifying the conditions for injection of water containing substances resulting from the operations for exploration and extraction of hydrocarbons or mining activities, and injection of water for technical reasons, into geological formations from which hydrocarbons or other substances have been extracted or into geological formations which for natural reasons are permanently unsuitable for other purposes. Such injections shall not contain substances other than those resulting from the above operations". Permit conditions may not require monitoring or measures to prevent hydraulic fracturing leading to impacts on aquifers.
In the Industry Emissions Directive (Appendix A [70]) a potential gap arises because of uncertainty over the hazardous character of fracturing fluids which would determine its applicability to hydraulic fracturing installations. The monitoring requirements may not be applied. There is no explicit mentioning of the sector, therefore no complex environmental permit under the Directive is required.
What concerns the downstream of the sector, the Natural Gas Directive (Appendix A [58]) is on supply security, consumers protection, access to transmission systems, and so on.
Pipeline networks are subject to the Directive but with no details on the underground setting. The transport and distribution network are covered by the Regulation on trans-European energy infrastructure and Regulation on measures to safeguard the security of gas supply (Appendix A [73,91]). The Deepwater Horizon disaster in 2010 induced a set of precautionary measures in the EU by regulating the offshore segment and parallel to it the marine policy developed (Appendix A [74,77,80,84,90]).

Regulatory Instruments of the Hydrocarbons Directive
The Directive was adopted on 30 May 1994 and came into effect on 30 June 1994. The deadline of transposition was 1 July 1995. National harmonizations were fluent, no pilot or infringement cases are known. Luxembourg and Finland are exempt from transposition by having no hydrocarbon resources. Article 13 provides a temporary derogation for Denmark that Articles 3 and 5 do not apply to new authorizations granted before 31 December 2012, in respect of the areas which are relinquished on 8 July 2012 upon expiry of the authorization issued on 8 July 1962. The Directive is also in force in the European Economic Area, Iceland and Norway publish calls regularly.
In the Directory of EU legal acts the Directive is classified to subchapters "06.20.10.20 Right of establishment and freedom to provide services/Sectoral application/Production and processing activities/Other production and processing activities", and to "12.50.30.00 Energy/Oil and gas/Other measures relating to oil or gas".
Since its publication, the Directive had one major amendment by Regulation 2018/1999/EU on the Governance of the Energy Union and Climate Action. It annulled Article 9 on the reporting obligation, and paragraph 2. of Article 8 on the reporting obligation of the EC on European oil and gas companies' activities in third countries. The 2016 Fitness Check proposed to repeal these by referring that their implementation failed (EC [35]).
To reinforcing the integration of the EU internal energy market, encouraging fair competition and improving the safety of supply, new rules are established by the Directive which guarantees non-discriminatory access to the prospection, exploration and production of oil and gas. It also provides the option to impose conditions and requirements on the ground of public health and protection of the environment. MS have sovereign rights over these resources within their territories. It is therefore up to MS decision makers to determine the geographical areas where the rights to explore and extract hydrocarbons can be exercised and to authorize companies to exercise those rights. Moreover, on the grounds of national security, states may refuse the claim of any entity.
The Directive stipulates that the borders of the geographical territories covered by a permit and the duration has to be defined in proportion to what is justified by means of the best possible performance of the activities from an economic and technical perspective. The objective is to prevent a single entity from bearing exclusive rights for an acreage whose activities can be performed more efficiently by multiple companies. The paragraph which provisioned for a single entity the right to acquire authorization was repealed by January 1997 (Art. 7).
According to Article 3, granting authorizations can be through a "licensing round" system initiated either by (aa) the competent authorities, or (ab) by an entity; or an "open door" system where the publication is not necessary in case (ba) the area is available permanently, or (bb) was already published but without granting, or (bc) the area was given back by the entity; or (bd) the area is contiguous to an active concessional area.
The two systems can be combined. All information must be published in the Official Journal of the European Union at least 90 days before the deadline for the submission of applications. The procedures for granting authorizations must be introduced in a transparent manner based on objective, non-discriminatory criteria, open to all interested entities. The selection among the various entities is based on their technical and financial capabilities, record of performance, proposed exploration and/or production, and the price which the entity is prepared to pay in order to obtain the authorization. MS may limit the publication of the criteria in case they already published those in their national journal (Art. 5(1)). MS may retain the right subject to considerations of national security, public health and safety, security of transport, protection of the environment and biological resources, the planned management of hydrocarbon resources. Most MS do not specify in their publications whether the call applies for unconventionals and fracking.
In line with the reciprocity principle with third countries, MS' entities must be able to receive treatment in third countries which is comparable to that which third countries' entities receive in the EU (Art. 8). MS are required to provide the list of their competent authorities, and any subsequent changes (Art. 10).
The implementation and interpretation of the Directive generated only a few EU Court of Justice cases. The Directive complements the Directive 2014/25/EU on the procurement procedures of entities operating in the water, energy, transport and postal services sectors (originally Directive 90/531).

National Regulatory Solutions
T he EUR-LEX database contains 718 documents in context of the Directive as of 31 December 2020. In all, 633 documents were published by 23 EU countries, 33 documents by EEA countries (Norway and Iceland), and 52 documents by the EU Court of Justice, EC, EP, EEA, EFTA. Estonia, Finland, Luxembourg, Slovenia, Sweden and Flanders (Belgium) did not publish any calls. The case of Estonia is somewhat surprising since it has the biggest oil shale production in Europe. According to the EUROSTAT, also Slovenia has hydrocarbon production, though insignificant.
The title of the publications is diverse: it can be a notice, communication, notification, announcement, invitation, application and corrigendum (Table 1). Six MS applied the options of the Directive voluntarily for other energy fuels, nonenergy minerals and surveys such as geothermal energy (Italy, Hungary), metalliferous ores, lignite, and coal (Hungary, Püspöki et al. [36]), coalbed methane (Belgium, Poland), and gravimetric survey (Croatia), respectively. This is a proof that countries prefer publishing open calls in the EU Official Journal as these generate a wide attention of potential investors in addition to national level calls, international roadshows and other promotions.
As indicated in Table 2, in the majority of countries (14 MS) the publishing entity is the Government (or State, Council of Ministers), and a Minister in charge of the sector. Among these, the publisher and final decision maker is the Government of Croatia, Cyprus, Germany, Romania, and the UK. In eight countries, besides the Government, a Minister or Ministry is indicated as the competent entity. In eight MS, and Iceland and Norway a Minister or a Ministry is the competent body. The "lowest" level decision maker in the public administration hierarchy is in Portugal, the Directorate-General for Energy and Geology.
Half of the 18 designated ministries belong to the industry and energy domain, the others' portfolio is on environment and natural resources, and others.
With the exception of three countries (Bulgaria, Czechia, Latvia), there is always a professional government agency or competent authority to assist interested applicants with information, decision makers with professional expert knowledge, and managing the evaluation procedure. These are energy agencies, mining agencies, geological surveys. In Germany and Slovakia first-instance regional mining inspectorates are involved. The Czech Republic and Latvia are the only countries with one entity indicated in the calls.
With the exception of Cyprus, Ireland, Malta and Norway all countries refer to their national legislation. Nine countries have specific acts, laws, regulations on hydrocarbons (Belgium (Walloon), Croatia, Greece, Latvia, Lithuania, Romania, Spain, UK, and Iceland), the rest refer to Mining (and Geology) Acts, Underground Resources Acts and implementing procedural by-laws.   Our analyses demonstrate that the most active countries at publishing calls are France, Netherlands, Poland, Hungary, Italy, the UK, and Norway, with 159 to 31 publications (Figure 1). The rest of the countries (18) had less than 10 published calls. The average number of pages of calls reflects the character of legal governance in a given jurisdiction. In this regard (Table 1, Figure 1) Eastern European countries are the frontrunners; Romania (10.3 pages/call) Poland (6.8 pages/call), Hungary (4.1 pages), and Greece (3.8 pages). The commitment of the new MS (2004-2013 accessions) to the Directive's options is evident. With regard to Art. 5(1), very few publications refer to their national calls, not even the 1-2 paged ones, which questions if calls comply with the requirements on the minimum content.
When interpreting the aggregated data, i.e., the number of all published pages (Figure 1), figures confirm the above findings, Poland, Hungary, France, and the Netherlands are the busiest. Surprisingly, with the exception of the Netherlands, these countries are not the biggest oil and gas producers in Europe. Poland, Hungary and France belong only to the third group of countries of hydrocarbons production.
On individual country scale, new exploration concepts and changing governments may have a decisive role in publishing activities, such as the shale gas exploration boom in Poland. In Hungary, the significant increase in publication was due to the re-introduction of the concession scheme in 2010 after a liberal permitting regime.

Discussion
The EC report on the Directive (EC [5]) concludes that MS have transposed the Directive into national law and confirms that no reciprocity problem was reported. However, most MS do not specify in their published concession tender whether the call applies for unconventionals and fracking. MS may not consider evenly environmental commitments and corporate history of good environmental performance of applicants during the evaluation of tenders.

Discussion
The EC report on the Directive (EC [5]) concludes that MS have transposed the Directive into national law and confirms that no reciprocity problem was reported. However, most MS do not specify in their published concession tender whether the call applies for unconventionals and fracking. MS may not consider evenly environmental commitments and corporate history of good environmental performance of applicants during the evaluation of tenders.
The reporting obligation for MS in Article 9 is to ensure a non-discriminatory access to and perform activities under conditions which support greater competition favouring best companies. Article 8(2)calls the Commission to report to the Council on the situation of companies in third countries, how reciprocity works.
According to the Fitness Check study (EC [35]), the implementation of Article 9 costs EUR 1,689 /MS/year. The benefits were assessed as significant, but the provision was identified to have quasi no relevance at all, given the fact that the objective of the MS reports is to provide information to the Commission summary under Article 8 (2). No such report has been released by the Commission since 1994, partly because the information to be submitted by MS under this obligation "can also easily be acquired via the notified tenders". The study found that "this obligation clearly represents an unnecessary administrative burden for MS". It revealed that such information was not requested by the relevant stakeholders and can therefore be interpreted "not to be seen as providing any potential benefits".
Quite often policy-and law-making are driven by political interests generated by abruptly emerging public pressure, as happened in the case of unconventional hydrocarbons and hydraulic fracturing. The momentum in this case was not sufficient to spur legislation.
The text search scores ( Figure 2) for both "energy", "hydrocarbon" and "oil" AND "gas" correlate well with each other, both in "all documents" and in "legal acts". The "energy" legislation peak is in 2014 when the Annex lists 6 pieces of legislation. The peak in 1973 is linked to the first oil price crisis. reports is to provide information to the Commission summary under Article 8 (2). No such report has been released by the Commission since 1994, partly because the information to be submitted by MS under this obligation "can also easily be acquired via the notified tenders". The study found that "this obligation clearly represents an unnecessary administrative burden for MS". It revealed that such information was not requested by the relevant stakeholders and can therefore be interpreted "not to be seen as providing any potential benefits". Quite often policy-and law-making are driven by political interests generated by abruptly emerging public pressure, as happened in the case of unconventional hydrocarbons and hydraulic fracturing. The momentum in this case was not sufficient to spur legislation.
The text search scores ( Figure 2) for both "energy", "hydrocarbon" and "oil" AND "gas" correlate well with each other, both in "all documents" and in "legal acts". The "energy" legislation peak is in 2014 when the Annex lists 6 pieces of legislation. The peak in 1973 is linked to the first oil price crisis. Hydrocarbons is a synonym of oil and gas, but the latter terminology is more in use, almost double in both datasets. There might be specific cases when both the oil and gas occur in the same document but not in the fossil fuel context, e.g., biogas and oilseed.
As expected, 6-10 times more policy documents were published in a given topic than legal texts in the last two decades. The difference was less before the turn of the century. Hydrocarbons is a synonym of oil and gas, but the latter terminology is more in use, almost double in both datasets. There might be specific cases when both the oil and gas occur in the same document but not in the fossil fuel context, e.g., biogas and oilseed.
As expected, 6-10 times more policy documents were published in a given topic than legal texts in the last two decades. The difference was less before the turn of the century. This decoupling may indicate that legislation making was more demanding during the last twenty years.
What concerns the historical trends of the curves, the document peaks show an obvious fit with major events and periods, with a certain delay in response:   Table 3). curves of the number of pages and the number of documents do not necessarily match; the former one has a peak in 2018 related to the detailed calls by Hungary and Poland (see Table 3).    In making an analysis of the legislation, it is beneficial to know what measurable impact it had on the regulated sector. In spite of their efforts, the authors could not find public data on exploration volumes or change in reserves or other figures representative of the upstream (e.g., number of employees, direct investment, royalty paid, etc.). Nevertheless, the annual production data available at Eurostat are visualized in Figure 4a-d where countries are grouped into four clusters.   Data source: Eurostat, Complete energy balances [nrg_bal_c], Crude oil, Natural gas.

Conclusion and Policy Implications
The presented work is one of the first studies which analyze EU policy documents and legislation by quantitative tools involving text mining techniques. This "a posteriori" impact assessment on the EU Hydrocarbons Directive shows that the transposition into Countries with the biggest outputs publish a lot (155 calls by The Netherlands, 40 by the UK, 31 by Norway) but countries in the third (159 calls by France, 79 by Poland, 71 by Hungary) and the second (53 calls by Italy) hydrocarbons output range are similarly or even more active in announcing calls (Table 3).
What concerns the trend of production, the continent has a mature extractive sector, outputs are decreasing, and few countries show a stable or slightly increasing production, such as UK, Norway, Ireland, Poland, Hungary, France. When considering that these countries are the most committed in publishing by choosing the licensing rounds option, it is an obvious conclusion that well prepared calls and successful performance of the sector may be interlinked. In countries choosing the licensing rounds option, the state invests in knowledge management of the targeted areas in order to make these areas attractive for the potential bidders and investors.

Conclusions and Policy Implications
The presented work is one of the first studies which analyze EU policy documents and legislation by quantitative tools involving text mining techniques. This "a posteriori" impact assessment on the EU Hydrocarbons Directive shows that the transposition into national laws was fluent but the implementation was not evenly accurate accrossthe MS. Partly for this reason, reporting and monitoring obligations were repealed in 2018.
The timewise text score curves of the acquis and the publication of hydrocarbon calls correlate with major economic events such as oil price booms, economic crisis, shale gas debate, EU accession waves. On a country scale, new exploration concepts, change in government and amended permitting schemes may also have a role in the publishing activity, for example in Poland and Hungary.
The EU policy and legislation making responded rather promptly to global and European challenges affecting the oil and gas industry, and the energy sector, as indicated by the historical curves of text scores in policy documents and laws. The Hydrocarbons Directive is an adequate piece to steer EU and EEA countries in publishing international calls open to all entities interested in hydrocarbons exploration and production and complying with sustainability criteria. Those countries which periodically re-assess their territories for hydrocarbons potential and serve this information during the licensing rounds are more successful than others who take the "wait and see" position by choosing the "open door" option of the Directive. These results support the conclusion that the introduction of a similar regulatory instrument for non-energy critical minerals could promote the transparent and sustainable exploration and extraction of these natural resources in Europe.

1.
Directive 67/548 on the classification, packaging and labelling of dangerous substances 2.
Directive 68/414 on obligation to maintain minimum stocks of crude oil and/or petroleum products 3.
Regulation 1056/72/EEC on investment projects in the petroleum, natural gas and electricity sectors 4.
Directive 76/464 on pollution caused by dangerous substances discharged into aquatic environment 6.
Directive 80/68 on the protection of groundwater against pollution caused by dangerous substances 7.
Directive 82/501 on the major-accident hazards of certain industrial activities (SEVESO I) 8.
Directive 85/337 on assessment of effects of certain public and private projects on the environment 9. Directive