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Short answer

There are many documented allegations, lawsuits and ongoing prosecutions against ENI for environmental harm — especially over oil spills and climate-related claims — but there are few (if any) clear-cut criminal convictions of ENI itself for “environmental crimes” that survive appeal. What exists is a mix of community lawsuits, regulatory fines, civil claims, and some criminal investigations whose outcomes vary by case and country. Reuters+4Business & Human Rights Resource Centre+4The Ferret+4

Environmental and ecological crimes

1. Allegations and community suits (Niger Delta and elsewhere)
   • Nigerian communities have sued ENI (and its Nigerian subsidiaries) for oil spills, contamination of land and water, and inadequate clean-up/compensation. Those cases are often civil claims seeking remediation and damages; some are still pending in Italian and Nigerian courts. Business & Human Rights Resource Centre+1
2. High-profile scandals (OPL 245) — corruption, not primarily environmental
   • The OPL 245 affair (massive controversy over how a Nigerian oil licence was awarded) led to criminal proceedings against intermediaries and wide scrutiny of ENI and Shell. Italian courts ultimately acquitted ENI and Shell in the main Milan proceedings and many civil claims were dismissed or dropped, though the saga produced convictions (and later some overturned rulings) for a few middlemen and even led to investigations into the conduct of prosecutors. This case is about alleged corruption rather than an environmental offence per se, but it’s often cited when discussing ENI’s corporate wrongdoing. Wikipedia+1
3. Climate and human-rights litigation (Italy and beyond)
   • NGOs and citizens (e.g., Greenpeace Italy and ReCommon) have sued ENI for climate-related harms and human-rights impacts. Italy’s highest courts recently confirmed that such civil suits may proceed in Italian courts, a significant step toward holding fossil-fuel companies civilly accountable for contribution to climate change (this is not a criminal conviction of ENI). AP News+1
4. Investigations, regulatory fines and other enforcement actions
   • ENI has faced regulatory penalties and antitrust fines (for example in 2024–2025) and administrative rulings related to commercial and market practices; some environmental marketing claims have been contested by regulators too. These are mostly administrative or civil penalties rather than criminal environmental convictions. Reuters+1
5. On-the-ground reporting and NGO investigations
   • Independent investigations and local reporting (e.g., in Nigeria) document oil-contaminated soil, polluted drinking water and impacts on livelihoods that local communities attribute to ENI operations or its Nigerian subsidiaries — and those reports underpin many civil suits and calls for remediation. ENI often attributes spills to sabotage/theft and says it compensates where appropriate; disputes over responsibility and clean-up continue. The Ferret+1

What this means legally and practically

• Allegation ≠ criminal conviction. Many serious allegations exist and have prompted lawsuits and investigations. However, whether ENI has committed crimes depends on court findings in the relevant jurisdiction and on whether judgments survive appeal. In many of the most public cases the company has denied liability and courts have either acquitted ENI, dismissed claims, or left matters unresolved. Wikipedia+1
• Ongoing risk. The company faces growing civil litigation (including climate cases) and regulatory scrutiny, so legal exposure and reputational risk are increasing even where criminal convictions are absent. AP News+1

More cases

1. Italian highest court lets the climate case against ENI proceed — On July 22, 2025 Italy’s Court of Cassation confirmed Italian courts have jurisdiction and sent the Greenpeace/ReCommon climate suit back to the Rome tribunal. That’s a major procedural win for plaintiffs and signals Italian courts will hear claims linking corporate strategy to climate harms. Reuters+1
2. Ongoing murk around OPL 245, but not a simple criminal conviction of ENI — OPL 245 remains legally complex: ENI publishes material saying its managers were acquitted; meanwhile the saga produced criminal prosecutions — and, later, convictions for certain prosecutors for withholding evidence — which complicates perceptions of the case. In short: lots of contested findings, acquittals in some trials, and continuing scrutiny. eni.com+1
3. Documented Niger Delta pollution, large calls for cleanup and remediation — Reporting and NGO work (and UN attention) continue to highlight persistent contamination in the Niger Delta and renewed political pressure for big-scale clean-ups and compensation from international oil companies (ENI among them). Local lawsuits and demands for multi-billion-dollar remediation funds are ongoing. Climate Home News+1
4. Regulatory/administrative penalties and greenwashing rulings exist — ENI has faced administrative fines (notably a €5 million AGCM decision in 2019 over misleading “green” advertising for Diesel+), and regulators continue to scrutinize environmental and marketing claims from oil majors. These are civil/administrative, not criminal, but they matter for corporate liability and reputation. climatecasechart.com+1
5. Allegations of legal pressure on critics (SLAPP-like behaviour) — Investigative reporting in 2025 documents multiple defamation suits and legal actions ENI launched against journalists and activists, prompting accusations that the company uses legal processes to silence critics. That’s important context when evaluating how disputes are litigated and reported. The Guardian

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What this means (short)

• There are many credible allegations, civil lawsuits and regulatory penalties tied to pollution, climate impacts and corporate conduct.
• But few straightforward, final criminal convictions against ENI as a corporate entity for environmental/ecological crimes survive appeal — the legal picture is fragmented across countries, different case types (civil vs criminal vs administrative), and procedural twists. Reuters+1

Why does few criminal convictions against ENI for environmental/ecological crimes survive appeal?

There are structural, legal, and procedural reasons why very few criminal convictions against ENI (or any major oil company) for environmental/ecological crimes survive appeal. It’s not simply “ENI is innocent”; it’s that proving criminal environmental liability at scale is extremely difficult. Here are the real reasons, clearly explained:

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1. Criminal environmental law is much harder to prove than civil liability

To convict a corporation criminally, prosecutors must establish intent or negligence at a criminal level (“beyond reasonable doubt”).
In environmental cases, this is difficult because:

• Pollution can be caused by multiple actors (sabotage, theft, poor infrastructure, state failures).
• Companies argue spills were due to “third-party sabotage” — a common claim in the Niger Delta.
• Showing that senior management knew and accepted environmental harm is extremely hard.

Civil cases (compensation, cleanup orders) require a much lighter burden of proof, so they succeed more often.

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2. Environmental damage often happens in weak governance zones

A large share of ENI’s environmental controversies originate in places where:

• Infrastructure is old or poorly maintained
• Oil theft and sabotage are widespread
• Environmental regulations are inconsistently enforced
• Evidence collection is difficult (no chain of custody, delayed inspections, destroyed sites)

This makes it easy for defense lawyers to argue that the evidence is unreliable, which appeals courts often accept.

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3. Procedural errors or investigative flaws often overturn convictions

Appeal courts frequently throw out cases because of:

• Mistakes by investigators
• Failure to follow strict technical procedures
• Missing or invalid environmental sampling
• Incomplete documentation of spill origin
• Incorrect attribution of responsibility
• Conflicting expert testimony

This is exactly what happened in the OPL 245–related prosecutions, where higher courts ruled the prosecution mishandled evidence.

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4. Corporate structure shields the parent company

ENI operates through subsidiaries (e.g., ENI Nigeria, NAOC).
On appeal, defense lawyers successfully argue:

• The subsidiary is responsible, not ENI S.p.A.
• Local contractors or joint ventures (e.g., with NNPC) were operationally in charge
• Criminal liability cannot be traced to ENI executives in Italy

Appeal courts tend to agree because criminal law requires identifying a specific responsible individual or corporate unit.

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5. Environmental crimes are often treated as administrative, not criminal

Even when environmental harm is clear, many countries classify violations as:

• Regulatory breaches → fines
• Administrative negligence → compliance orders
• Civil damage → compensation

Therefore, cases start as criminal but get reclassified on appeal.

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6. Powerful defence teams and unlimited litigation budgets

ENI, like all major oil giants, hires:

• Multiple top-tier law firms
• World-class scientific experts
• Crisis management specialists
• Former regulators or technical advisors

This means:

• They can litigate for years
• They can challenge every technical point
• They can force appeals courts to examine procedural defects
• Plaintiffs often run out of resources

Over long timelines, convictions erode.

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7. Ambiguous regulatory frameworks

In many jurisdictions:

• Pollution laws are outdated
• Responsibility for spills is poorly defined
• Joint-venture structures blur accountability
• Environmental enforcement agencies are underfunded
• Criminal statutes require proof of intent, not just damage

Ambiguity benefits the defendant at the appeal stage.

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8. International political pressure

Environmental cases often intersect with:

• Host country politics
• National oil company interests
• Geopolitical energy relationships
• State revenues tied to oil operations

Appeal courts tend to avoid criminalizing a major operator unless evidence is overwhelming and airtight.

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🔍 Summary (in one sentence)

Criminal convictions against ENI rarely survive appeal because environmental harm is hard to attribute with criminal-level certainty, investigations often contain procedural weaknesses, corporate structures diffuse responsibility, and appeals courts favor strict standards that defendants can exploit.