Solar Panel Installation and Grid Connection: The Legal Framework for Household Small Power Plants

Household-scale small power plants (HMKE — háztartási méretű kiserőmű) — typically solar panel systems — have seen mass adoption in Hungary in recent years. The regulatory environment changed significantly from 2024: the previous net metering system was replaced by gross metering, fundamentally transforming the economics of investment returns and contractual relationships. Below, we examine the applicable legal framework, the actual contractual risks, and the possibilities for condominium energy communities.

Legislative Foundations of HMKE Regulation

The Applicable Regulatory Framework

The regulation of household-scale small power plants comprises:

• Act LXXXVI of 2007 on electricity (VET) — the fundamental framework for electricity generation, distribution, and consumption
• Government Decree 273/2007 (X.19.) implementing the VET (Vhr.) — detailed rules on HMKE grid connection and metering
• MEKH regulations and decisions — pricing and licensing rules issued by the Hungarian Energy and Public Utility Regulatory Authority (MEKH)
• Directive (EU) 2019/944 on the internal market for electricity (the EU framework for the “active customer” concept)
• Directive (EU) 2018/2001 (RED II) on the promotion of renewable energy (renewable energy communities framework)

What Is an HMKE?

Under the VET and Vhr., a household-scale small power plant is a generating installation with a nominal capacity not exceeding 50 kVA, designed to partially or fully satisfy the electricity needs of the user, connected to the grid connection point of the consumption site.

The Gross Metering System

The Transition from Net to Gross Metering

HMKE installations established before 2024 operated under net metering (szaldó elszámolás): electricity fed into the grid and electricity drawn from it were offset against each other, with the user paying only for the balance. This system was extremely favourable for HMKE owners.

For new HMKE installations from 2024 onwards, gross metering (bruttó elszámolás) applies:

• For electricity fed into the grid, the user receives a feed-in tariff determined by the MEKH (typically lower than the consumer price)
• For electricity drawn from the grid, the user pays the standard consumer price
• The two flows are accounted for separately — there is no netting

Impact of Gross Metering on Returns

Gross metering has significantly changed return calculations:

• The difference (“spread”) between the feed-in tariff and the consumer price represents a loss for the HMKE owner on every kilowatt-hour fed in and later drawn back
• The economically optimal strategy: maximising self-consumption of own production
• Battery energy storage has therefore become economically more valuable

The Grid Connection Agreement

Contractual Structure

A grid connection agreement is concluded between the HMKE owner and the distribution system operator (e.g. E.ON, ELMŰ-ÉMÁSZ, the relevant regional distributor), which specifies:

• The HMKE’s nominal capacity and technical parameters
• Feed-in conditions — including maximum feed-in capacity
• The metering method (gross metering under the new system)
• Requirements for technical protection equipment (for grid safety purposes)

Feed-in Limitations — Not a “Dynamic Pricing Clause”

The “Dynamic Pricing Clause” referenced in the raw text, under which the provider could supposedly apply “negative prices,” is a non-existent legal institution in HMKE regulation:

1. Negative prices in the wholesale market — negative electricity prices do occur on the organised exchange market (HUPX — Hungarian Power Exchange), typically during periods of high renewable production and low demand. However, this is a wholesale market phenomenon that does not directly affect HMKE owners.

2. The HMKE feed-in tariff is regulated — the feed-in tariff is determined by the MEKH, not by market prices or unilateral provider decisions. “Applying negative prices” to HMKE owners is not part of the current regulatory framework.

3. Feed-in curtailment — what does exist: the distribution system operator may curtail feed-in for technical reasons (grid overload, voltage level issues). This is not a “pricing” matter but a grid security measure authorised by the VET and Vhr.

4. The active customer concept — Directive (EU) 2019/944 introduced the concept of the “active customer,” referring to consumers who generate, store, or sell electricity. Transposition into Hungarian law is ongoing, but this does not mean HMKE owners are exposed to “dynamic pricing.”

Consumer Protection Issues

The “Guaranteed Return” Problem

The raw text correctly notes that consumer protection focuses on the misleading practices of installation companies. The legal framework:

• Act CLV of 1997 on consumer protection (Fgytv.) — installation companies selling and installing HMKE systems fall within the scope of consumer protection law

• Unfair commercial practices — if an installer promises “guaranteed returns” under the gross metering system, this may constitute an unfair commercial practice under Act XLVII of 2008 (Fttv.), particularly if:

  • The return calculation is based on the former net metering conditions
  • It fails to account for the impact of gross metering
  • It does not disclose the difference between the feed-in tariff and consumer price
  • It presents misleading yield projections

• GVH enforcement — the Hungarian Competition Authority (GVH) may act ex officio against unfair commercial practices (Section 10 Fttv.)

• Warranty liability — the installed system is subject to warranty for defects under Sections 6:157–6:178 Ptk.; if the system fails to meet the performance specified in the contract, warranty claims may be pursued

Pre-contractual Disclosure

The disclosure obligation under Section 6:62 Ptk. also applies to installation companies: they must inform the client about the investment’s material characteristics — including the metering system, factors affecting expected returns, and grid connection conditions.

Condominium Solar Projects

The EU Framework for Energy Communities

The raw text refers to a “2026 Energy Community Act.” No such standalone act exists. The regulatory framework for energy communities derives from EU directives:

• Directive (EU) 2018/2001 (RED II) Article 22 — renewable energy communities
• Directive (EU) 2019/944 Article 16 — citizen energy communities

Transposition into Hungarian law is being carried out through amendments to the VET and related decrees — not through a standalone act. Transposition remains ongoing in 2026; detailed rules are evolving gradually.

Legal Issues of Condominium Solar Systems

Solar systems installed on condominium rooftops raise genuinely complex legal questions, but these can be addressed under existing legislation:

1. Property Law — Common Property (Tht. + Ptk.)

• The condominium roof is common property (Section 1(2) Tht., Section 5:85 Ptk.)
• Installing a solar system requires an assembly resolution — the Tht. and bylaws determine the required voting threshold
• Decisions on the use of common property are made by the community of co-owners (Section 28 Tht.)

2. Yield Sharing

• Co-owners share the solar system’s yield (generated electricity, feed-in tariff revenue) in proportions specified in the agreement
• Options for determining proportions:
  • Based on ownership shares (Section 5:73 Ptk. — general rule for exploitation of common property)
  • Based on actual consumption (in proportion to metered consumption)
  • A hybrid method — by free agreement of the parties

3. Contractual Structure

What is needed is not a “three-sided contract system” as the raw text claims, but the following independent agreements:

• Assembly resolution and/or bylaws amendment — authorising the solar installation and recording yield-sharing rules
• Works contract with the installer (Sections 6:238–6:250 Ptk.) — design, procurement, and installation
• Grid connection agreement with the distribution system operator — grid connection conditions
• If establishing an energy community: the energy community’s founding document and operating rules under the VET and applicable decrees

4. Notarised Deed — Not Mandatory, but Useful

The raw text characterises notarisation of the yield-sharing agreement as “essential.” This is not a statutory requirement:

• Under Section 6:59 Ptk. (freedom of contract), the parties may validly regulate yield sharing in a written agreement
• The advantage of a notarised deed: evidential force as a public document (Section 323 Pp.) and direct enforceability (Act CLXI of 2017)
• As a practical recommendation, it may be warranted for higher-value investments, but it is not “essential”

The Role of the MEKH

The Hungarian Energy and Public Utility Regulatory Authority (MEKH) plays a central role in HMKE regulation:

• Price regulation — determining feed-in tariffs and offtake conditions
• Licensing — supervising distribution system operators, reviewing grid connection conditions
• Consumer protection — performing electricity market consumer protection functions (Section 145 VET)
• Dispute resolution — resolving disputes between HMKE owners and distributors

Practical Advice

Before Installing an HMKE

1. Understand gross metering — return calculations must be based on the gross metering system; treat net-metering-based “guaranteed return” promises critically
2. Maximise self-consumption — the economically optimal strategy is using own production on-site; consider battery storage
3. Review the grid connection agreement — feed-in conditions, technical limitations, and the metering method are specified in the contract
4. Choose the installer carefully — have the works contract (Section 6:238 Ptk.) specify the system’s technical parameters, warranty terms, and performance guarantees

For Condominium Solar

1. Assembly resolution — installation requires the voting threshold specified in the Tht. and bylaws; record yield-sharing rules in the resolution
2. Yield-sharing agreement — record proportions among co-owners in a written agreement; consider notarisation for higher-value investments
3. Monitor energy community frameworks — transposition of EU directives is ongoing; the legal framework may evolve
4. Consult the distributor — discuss condominium HMKE grid connection conditions with the distribution system operator in advance

In Case of Misleading Practices

1. GVH complaint — if the installer made misleading return promises, you may approach the Hungarian Competition Authority (Section 10 Fttv.)
2. Consumer protection authority — file a complaint for misleading information (Fgytv.)
3. Warranty claim — if the installed system does not meet contractual specifications, pursue a warranty claim under Section 6:159 Ptk.
4. MEKH complaint — for grid or metering disputes related to the HMKE, approach the MEKH

Solar investment may remain economically justified in 2026, but the legal and economic conditions have changed significantly with the introduction of gross metering. Accurate knowledge of return calculations and contractual risks — rather than references to fabricated legal institutions — forms the basis for informed decisions.