Why SolServices is adding battery storage: the 150 MW / 300 MWh Huawei programme

SolServices and Huawei Technologies Hungary signed an agreement on 30 September 2026 for a 150 MW / 300 MWh battery portfolio next to SolServices' Hungarian solar parks, with full operation targeted for Q1 2027. The reason is simple: negative prices and scarce grid connections make storage and hybrid parks worth building on the connections SolServices already holds.

Dr Gábor Juhász-Farkas, one of SolServices' managing directors (ügyvezető), set out the reasons at the signing and in a July 2026 interview. The sections after them show the market and grid data behind each one.

What did SolServices and Huawei announce?

SolServices Kft. and Huawei Technologies Hungary signed an agreement on 30 September 2026 to build a battery energy storage system (BESS) portfolio of 150 MW and 300 MWh next to SolServices' existing solar parks. The agreement was signed at Huawei's Digital Power Summit 2026 and announced at a press conference in Budapest (Hungary Today, MTI).

The first units are already in place. The first element was connected at Lumen Park Mezőtúr by July 2026, as Dr Juhász-Farkas said in an interview republished on SolServices' website, and by the signing the first units at Mezőtúr and Mezőberény had been commissioned (Hungary Today, MTI).

At the signing, the company put its operating solar portfolio in Hungary at about 380 MW.

Why is SolServices adding battery storage?

The batteries answer negative prices and scarce grid capacity, and they are a step towards hybrid parks that combine solar, storage and wind. There are five reasons:

• Negative prices. In the July 2026 interview, Dr Juhász-Farkas called battery storage an obvious and effective response to the growing number of zero and negative price hours. He said storage protects against negative prices, adds grid flexibility and lets the company time its output better.
• Grid utilisation. At the signing he said a solar park's connection point is used only 16% of the time on an annual average, and that combining solar, wind and storage can raise this above 40% (a24.hu).
• Hybrid strategy. The deal is a step towards an integrated platform where solar, storage, wind and geothermal complement each other (SolServices on LinkedIn). In the interview Dr Juhász-Farkas said the company aims to add wind capacity at each of its solar parks, and called hybridising existing connection points one of the most cost-effective development directions from a grid perspective.
• Commercial viability. At the signing he said the project's market financing shows that storage is now a commercially viable technology that can be built on a market basis (Hungary Today).
• Trading and balancing markets. In the interview he said SolServices founded its own trading company, Lumen Trade, in February 2026 to run generation, storage and trading as one portfolio, and that Lumen Trade is meant to sell battery capacity on domestic and regional balancing markets. He also said the company expects average prices in the system-services market to fall as Hungary joins the European balancing platforms. How batteries can earn from those markets is covered in Hungary's battery storage revenue stack after PICASSO and MARI.

The sections below show the market and grid data behind them.

Why does midday solar lose value in Hungary?

Hungarian solar plants produce at the same hours, so midday output sells at a discount to the average price. On this site's calculation, Hungarian solar earned about 57.5% of the baseload day-ahead price in 2025, down from about 90% in 2020 and 2021, and about 11% of its 2025 output fell in negative-price periods (solar capture rate in Hungary).

A two-hour battery charged around noon and discharged into the evening moves energy from the weakest hours to stronger ones. That is the logic behind the co-location case.

Which SolServices parks feel negative prices directly?

It depends on how each park sells its power. SolServices runs three plants under the KÁT feed-in tariff, one under the METÁR premium scheme and, built in recent years, two on market terms (interview).

A market-exposed park feels negative prices directly, so a battery that absorbs its noon output has the clearest job there.

Why add batteries to existing solar parks rather than new sites?

Because in Hungary the grid connection is often the scarcest asset, and an existing solar park already has one. Under section 9/D of Decree 273/2007, MAVIR sets one national limit on the solar and wind capacity the system can absorb. A network licensee must refuse a medium- or high-voltage connection request above that limit, unless an exception applies, such as a winning tender bid.

The 2026 MEKH grid-capacity tender is for wind, and solar cannot be bid in it, so it opens no new capacity for solar parks. Its terms are in the guide to the 702 MVA grid-capacity tender.

Against that background, an existing connection that sits idle most of the day is valuable. With the connection used only 16% of the time on average, a battery can charge from the park's output and discharge through the same connection after sunset, so the connection works for more hours. The steps for adding storage behind an existing connection, from the technology-change request to the storage licence, metering and scheduling, are set out in wind, solar and BESS on one grid connection.

What are the limits of the co-location case?

Co-location solves the connection problem but brings trade-offs. The main ones in the public record are:

• A shared export limit. Park and battery share one connection, so they cannot both export at full power at once. Energy News South East Europe notes that co-located batteries help protect solar capture prices, while independently connected batteries can operate more freely across wholesale and balancing markets.
• Spread compression. More batteries chasing the same price gaps will narrow them. The fleet-growth figures and the saturation warning from market participants are in the battery storage revenue stack article.
• Bankability. Dr Daniel Orosz, a partner at the Budapest law firm Kapolyi, wrote in Energy-Storage.news that bankability of Hungarian storage is still an issue because there is no established business model, which favours equity investors. The SolServices portfolio is financed entirely on commercial terms.
• Duration. A two-hour battery can shift part of the midday output into the evening peak, but it cannot carry a park through the night or a run of cloudy days.

What this means for solar park owners and investors

SolServices' announcement is one company's answer, but the signals behind it apply to any Hungarian solar park.

• Owners of market-exposed parks should track how much output lands in zero and negative hours, not just how many such hours there are. That volume is what a battery would rescue.
• Holders of existing connections have an asset that is hard to replace, because new solar connections draw on the same national limit and the current MEKH tender is for wind. Adding storage behind that connection is one route to more output value without new grid capacity.
• Investors valuing co-located storage should model both energy shifting and balancing income, then apply a haircut for the fast growth in Hungarian battery capacity and for cross-border competition after PICASSO and MARI.
• Parks on support schemes face a different calculation, because their revenue is less tied to the hourly price. The case for storage there depends on the scheme's rules.

The next milestone is Q1 2027, when the full portfolio is due in commercial operation. The battery storage programme page follows its progress.