How Germany's 12th GWB Reforms Change Energy M&A in 2026, What Buyers, Sponsors and Renewable Investors Must Do

Last reviewed: 19 July 2026

Germany’s 12th amendment to the Act against Restraints of Competition (GWB) has reshaped merger control Germany energy transactions must navigate before closing. The reform recalibrates the turnover thresholds that determine whether a concentration requires notification to the Bundeskartellamt, tightens aggregation rules for portfolio investors, and arrives alongside heightened foreign direct investment (FDI) scrutiny of critical energy infrastructure. For M&A counsel, private equity sponsors and renewable asset managers, the combined effect is a material expansion of filing obligations, longer deal timetables and new negotiation dynamics.

This guide translates the statutory changes into actionable compliance steps, threshold tests, worked examples, a sponsor playbook and a comprehensive filing checklist, so that every party to a 2026 energy deal can identify risk early and structure around it.

Snapshot, What the 12th GWB Amendment Changed

TL;DR: The 12th GWB amendment modifies the jurisdictional turnover tests in Sections 35–39 GWB, adjusts the domestic‑turnover limb relevant to smaller energy targets, introduces refined aggregation rules for fund‑level portfolio calculations, and strengthens the Bundeskartellamt’s procedural toolkit for in‑depth reviews. The changes are published in the Bundesgesetzblatt (Federal Law Gazette) and are accompanied by updated Bundeskartellamt guidance on the obligation to notify.

Key Statutory Amendments

The core merger‑control mechanism under German competition law Germany practitioners rely on has always rested on a two‑limb turnover test. A concentration is notifiable when the combined worldwide turnover of all undertakings concerned exceeds a specified threshold and at least one undertaking achieves domestic turnover above a second threshold, with the target or another party also exceeding a minimum domestic revenue figure. The 12th GWB amendment recalibrates each of these figures to reflect the growth in nominal revenues across the economy and the Bundeskartellamt’s stated goal of capturing competitively significant transactions in strategic sectors, energy and digital markets chief among them.

Alongside the headline threshold adjustments, the amendment refines how turnover is aggregated for private equity fund structures and institutional investors. Under the revised rules, the turnover of portfolio companies controlled by the same ultimate fund group may be attributed more broadly, meaning that a sponsor acquiring a single wind‑farm SPV could find itself above the filing threshold when its other German energy holdings are included. This aggregation logic extends the reach of merger notification Germany obligations into deal sizes that historically fell below the radar.

The amendment also expands the Bundeskartellamt’s procedural powers. The authority gains clearer statutory grounds for interim measures during a Phase II in‑depth review, and the reforms confirm the regulator’s ability to impose structural or behavioural remedies tailored to energy market characteristics such as generation capacity, grid access and balancing obligations.

Effective Dates and Transitional Rules

The 12th GWB amendment entered into force upon publication in the Bundesgesetzblatt. Transactions for which a binding agreement (or public bid) was concluded before the effective date remain subject to the prior thresholds, provided notification is filed within the transitional window specified in the amending statute. All other concentrations are assessed under the new rules.

How to Test Whether a 2026 Energy Deal Triggers Merger Notification

TL;DR: Apply a three‑step process, identify the parties, aggregate turnover correctly (including PE portfolio attribution), then measure against the revised thresholds. The merger control thresholds Germany now applies capture more mid‑market energy transactions than before.

Step 1, Identify Parties and Turnover Aggregation

Begin by mapping every undertaking concerned. For an asset deal, this means the buyer (and its group) and the target business. For a share deal involving a private equity fund, the “undertaking concerned” includes all entities controlled by the fund’s management company and, under the revised aggregation rules, may include sister funds under common management where they hold controlling interests in other German portfolio companies. Turnover is calculated on the basis of net revenues in the last completed financial year, following the methodology set out in the Bundeskartellamt’s published guidance on the obligation to notify.

Energy‑specific nuances matter here. Revenue from electricity or gas sales may be allocated to Germany based on the location of the delivery point, not the contracting entity’s registered seat. Feed‑in tariff payments from grid operators and capacity‑market revenues are included. Practitioners should also verify whether any de minimis exemption applies, certain carve‑outs for small‑market participants remain, but the revised thresholds have narrowed their scope.

Step 2, Apply New Thresholds

Once aggregated turnover figures are assembled, test them against the revised two‑limb framework. The combined worldwide turnover of all undertakings concerned must exceed the global threshold. At least one undertaking must achieve domestic (German) turnover above the upper domestic limb, and another undertaking must achieve domestic turnover above the lower domestic limb. The revised figures raise the global threshold moderately but adjust the lower domestic limb in a way that catches more mid‑sized targets, a design choice the Bundeskartellamt’s 2025 background paper described as intended to address gaps in the enforcement of merger control in strategic sectors, including energy.

If both limbs are met, a mandatory pre‑closing notification is required. The transaction may not be implemented until the Bundeskartellamt has cleared it or the statutory review period has expired without a prohibition decision.

Worked Example, PV Portfolio Acquisition by a PE Fund

Consider a mid‑market scenario typical of renewables acquisitions Germany is seeing in 2026. A pan‑European infrastructure fund proposes to acquire a portfolio of operational solar PV assets generating approximately €40 million in annual revenue (feed‑in and merchant sales combined). The fund’s management company already controls two German onshore wind holdings with combined domestic turnover of €90 million. Assumptions for the worked example:

Under the pre‑reform thresholds, the target’s domestic turnover alone may have fallen below the former lower limb, making the deal non‑notifiable. Industry observers expect that a meaningful proportion of mid‑market energy M&A Germany has seen in recent years will now cross the revised line, increasing the volume of filings the Bundeskartellamt handles in this sector.

Regulator Behaviour and Enforcement Priorities, Bundeskartellamt in 2026

TL;DR: The Bundeskartellamt has signalled that energy and digital markets are priority enforcement sectors. Early indications suggest more Phase II reviews for transactions involving generation capacity concentration, grid‑bottleneck areas and balancing‑market incumbency.

In its 2025 background paper on merger control in transition, the Bundeskartellamt outlined why existing thresholds failed to capture certain competitively significant transactions, particularly in energy, where asset‑light SPV structures and fragmented project ownership kept turnover figures below the old notification line. The paper identified generation‑market concentration in specific bidding zones, vertical integration between generation and retail supply, and control of grid‑connection capacity as substantive areas warranting closer scrutiny under competition law Germany practitioners must apply.

The regulator has also indicated a willingness to use the transaction‑value threshold (Section 35(1a) GWB) where the consideration paid for a target significantly exceeds its turnover, a scenario common in renewables, where project pipelines carry development‑stage value far above current revenues. Practitioners should be alert to the possibility that even nominally sub‑threshold deals may be called in if the purchase price signals competitive significance.

Remedies and Typical Timelines

Phase I review remains one month from complete notification. If the Bundeskartellamt opens a Phase II in‑depth investigation, the statutory period extends to an additional four months (with possible extension). For energy deals, the likely practical effect will be total review periods of five to seven months in complex cases, particularly where remedies discussions involve divestiture of generation assets or access‑to‑grid undertakings. The authority may impose interim measures, such as hold‑separate obligations or restrictions on operational integration, during the review, reinforcing the importance of robust interim covenants in deal documentation.

Interaction with FDI Screening and Sectoral Consents for Merger Control Germany Energy Deals

TL;DR: Merger notification and FDI screening are separate, parallel regimes. For energy deals, a third layer, sectoral consents (grid connection, generation permits, Bundesnetzagentur approvals), may also apply. Failure to sequence these correctly is the single largest timetable risk in 2026.

FDI screening Germany applies through the Foreign Trade and Payments Act (AWG) and the Foreign Trade and Payments Ordinance (AWV), administered by the Federal Ministry for Economic Affairs and Climate Action (BMWK). Any acquisition of a German energy company by a non‑EU/EFTA buyer, or, in the case of critical infrastructure, any non‑German buyer, may trigger a mandatory notification to the BMWK. The definition of critical infrastructure captures electricity generation above specified capacity thresholds, gas storage, and grid assets. Even minority stake acquisitions (voting rights of 10 per cent or more) can trigger FDI filing obligations for critical infrastructure targets.

The FDI review runs on its own statutory timetable (typically two months, extendable to four months and beyond in complex cases) and is independent of the Bundeskartellamt merger control process. However, neither clearance substitutes for the other. A deal may receive Bundeskartellamt merger clearance but still be prohibited or subjected to conditions by the BMWK on investment‑screening grounds, or vice versa.

For renewables acquisitions Germany is experiencing at pace, a third layer of consents compounds the complexity. The Bundesnetzagentur oversees grid connection agreements, and regional authorities manage generation and construction permits. Transferability of these permits upon a change of control is not automatic, it depends on the permit terms, the applicable state‑level legislation, and the grid operator’s own processes. Delays in obtaining transfer confirmations can stall closing even after both merger and FDI clearances are in hand.

Practical Sequencing for Combined Filings

Best practice in 2026 is to initiate all three workstreams in parallel as soon as deal terms are agreed. File the Bundeskartellamt notification on Day 1 post‑signing, submit the BMWK FDI notification simultaneously (or within days), and open dialogue with the relevant grid operator and permitting authority about the change‑of‑control process. Coordinate the information requests, the Bundeskartellamt will require market‑share data and competitive‑overlap analysis, while the BMWK focuses on ownership chains, ultimate beneficial ownership and security‑of‑supply implications. Pre‑notification discussions with the Bundeskartellamt are strongly recommended for complex energy transactions and can materially shorten Phase I review times.

Sponsor and Buyer Playbook, Timetables, Covenants and Negotiation Levers in Private Equity Germany M&A

TL;DR: The expanded filing obligations and longer potential review timelines demand adjusted deal structures. Sponsors should budget six to nine months from signing to closing for complex energy deals and build protective mechanisms into every SPA.

The 12th GWB amendment, combined with active FDI screening, means that the signing‑to‑closing gap for energy M&A Germany transactions has widened materially. For private equity sponsors accustomed to three‑ to four‑month timetables, this recalibration affects fund deployment schedules, interim‑period risk allocation and break‑fee economics. The following playbook sets out the key adjustments.

First, long‑stop dates need to be extended. A long‑stop period of nine to twelve months from signing is now prudent for any deal that triggers both Bundeskartellamt notification and BMWK FDI review. This accommodates Phase II merger review (up to five months), a parallel FDI review (up to four months), and a buffer for sectoral consents and grid‑operator confirmations.

Second, regulatory closing conditions should be drafted with precision. Distinguish between merger clearance (Bundeskartellamt), FDI clearance (BMWK) and any material sectoral consents. Make each a separate condition precedent so that the parties understand which authority’s decision drives the timetable, and can negotiate termination rights accordingly.

Third, interim operational covenants become critical. The seller must maintain the target business in the ordinary course during an extended interim period. For energy assets, this means preserving grid‑connection agreements, maintaining generation licences, continuing offtake contracts and not entering into new PPAs without buyer consent. Without these protections, the asset the buyer contracted to acquire may differ materially from the asset delivered at closing.

PE Sponsor Checklist

• Turnover aggregation audit. Before signing, map the fund group’s existing German energy portfolio and aggregate turnover to confirm whether the new thresholds are met. Run the calculation using the Bundeskartellamt’s published methodology.
• Transaction‑value threshold check. If the purchase price significantly exceeds the target’s current turnover (common for development‑stage renewables), assess whether the transaction‑value threshold under Section 35(1a) GWB applies.
• FDI exposure assessment. Determine whether the fund’s ultimate investors include non‑EU/EFTA limited partners holding significant influence, which could trigger BMWK scrutiny.
• Long‑stop and break‑fee calibration. Model the economic cost of a nine‑ to twelve‑month interim period. Negotiate a reverse break fee that compensates the seller if the buyer fails to obtain regulatory clearance.
• Interim covenant package. Require the seller to deliver monthly compliance certificates covering: grid connection status, permit validity, offtake contract performance, capital expenditure within agreed parameters, and no material operational changes.
• Remedies strategy. Prepare a remedies offer in advance for Phase II scenarios, identify which assets or commitments could be divested or offered as behavioural undertakings without destroying deal economics.
• Data‑room preparation. Ensure the merger‑filing information pack (market shares, competitive overlaps, supply agreements) and the FDI submission (ownership chain, UBO declarations, security‑of‑supply analysis) are assembled during due diligence, not after signing.

Typical Negotiation Positions and Sample Clause Language

Sellers will push for shorter long‑stop dates, limited reverse break fees and broad interim operational discretion. Buyers, particularly PE sponsors with parallel FDI exposure, should counter with language that ties the long‑stop date to a specified number of months after the last regulatory filing is formally accepted by the relevant authority, rather than a fixed calendar date. Sample clause concept: “The Long‑Stop Date shall be the date falling [nine] months after the later of (i) formal acceptance of the Bundeskartellamt notification and (ii) formal acceptance of the BMWK investment‑control notification, provided that if either authority issues an information request extending the review period, the Long‑Stop Date shall be extended day‑for‑day.”

This approach protects the buyer against unpredictable regulatory timetables while giving the seller a defined outer boundary. Reverse break fees in the range of 3–6 per cent of enterprise value are becoming market standard for energy deals subject to dual regulatory review, early indications from 2026 transactions suggest.

Practical Risk Register and Notification Checklist for Energy Deals

TL;DR: Use this checklist as a one‑page reference for counsel advising on merger notification Germany energy transactions require. It covers the full sequence from threshold test to closing.

• Threshold test completed. Aggregate turnover calculated per revised GWB Sections 35–38; transaction‑value threshold assessed where relevant.
• Pre‑notification contact with Bundeskartellamt. Informal pre‑notification discussions initiated for complex cases (recommended for all Phase II candidates).
• Notification form prepared. Bundeskartellamt form completed with market definitions, competitive overlaps, supply/demand data and energy‑specific metrics (installed capacity, market share by bidding zone).
• Confidentiality request filed. Business secrets and commercially sensitive data flagged in the notification; confidentiality request submitted to the Bundeskartellamt.
• FDI notification prepared and filed. BMWK investment‑control filing submitted simultaneously with merger notification; UBO declarations and security‑of‑supply analysis included.
• Sectoral consents mapped. Grid‑connection transfer requirements, generation permit transfer obligations and Bundesnetzagentur approvals identified; dialogue with grid operator opened.
• Interim measures plan. Hold‑separate obligations and gun‑jumping compliance procedures documented and communicated to both buyer and seller management teams.
• Filing fee paid. Bundeskartellamt filing fee calculated and paid upon notification submission.
• Timeline tracker established. Statutory deadlines (Phase I: one month; Phase II: four months plus extensions) logged with alerts; parallel FDI and sectoral consent timelines tracked.
• Remedies package on standby. Potential structural/behavioural remedies identified and pre‑approved by the buyer’s investment committee.

Templates and Worked Examples

TL;DR: Two common deal scenarios illustrate how the filing decision and timetable planning differ under the reformed merger control Germany energy framework.

Scenario A, Domestic energy asset sale to a strategic buyer. A German municipal utility (Stadtwerk) sells a 150 MW onshore wind portfolio to a larger German utility. The seller’s group turnover is €800 million (all domestic). The buyer’s group turnover is €12 billion worldwide, with €6 billion domestic. The target’s standalone turnover is €55 million. Both limbs of the turnover test are clearly met. Filing decision: mandatory Bundeskartellamt notification. FDI screening: not required (both parties are German). Sectoral consents: grid‑connection transfer confirmation required from the relevant transmission or distribution system operator. Expected timetable: four to six weeks (Phase I clearance likely given no significant competitive overlap in the relevant bidding zone).

Recommended long‑stop: six months (conservative buffer for Phase II if overlaps emerge).

Scenario B, Portfolio carve‑out sold to a PE sponsor. A Nordic energy group carves out a mixed German renewables portfolio (wind and solar, €70 million revenue) and sells it to a UK‑based infrastructure fund. The fund already holds German energy assets with €100 million combined turnover. Aggregated fund‑group worldwide turnover: €3.5 billion. Filing decision: mandatory Bundeskartellamt notification (both limbs met after portfolio aggregation). FDI screening: mandatory BMWK notification (non‑German buyer acquiring critical energy infrastructure). Sectoral consents: grid‑connection transfers, generation‑permit transfers and Bundesnetzagentur dialogue required. Expected timetable: six to nine months (parallel Phase I/II merger review plus FDI review plus permit transfers). Recommended long‑stop: twelve months with day‑for‑day extension for regulatory information requests.

Conclusions, Immediate Next Steps for Buyers, Sponsors and Renewables Investors

The 12th GWB amendment has fundamentally altered the filing calculus for merger control Germany energy transactions. Practitioners should act now on five fronts:

1. Re‑run threshold tests on every live and pipeline deal using the revised turnover figures and aggregation methodology.
2. Extend long‑stop dates in all SPAs to accommodate parallel merger‑control and FDI review timetables, nine to twelve months is the new baseline for complex energy deals.
3. Build dual‑track filing strategies so that Bundeskartellamt and BMWK notifications are submitted simultaneously on signing.
4. Strengthen interim covenants to protect asset value during extended review periods, particularly grid connections, permits and offtake contracts.
5. Engage specialist energy M&A and competition counsel early to pre‑empt Phase II risk, prepare remedies packages and coordinate with all relevant authorities. Find experienced M&A and energy lawyers in Germany through our directory.

Sources

1. Bundeskartellamt, Merger Control: Obligation to Notify
2. Bundesgesetzblatt (Federal Law Gazette)
3. Federal Ministry for Economic Affairs and Climate Action (BMWK)
4. Bundesnetzagentur
5. OECD, Note by Germany on Competition and Merger Policy
6. European Commission, Merger Control