Groundbreaking at the Tvarditsa industrial zone

On 20 October 2026, Bulgarian Prime Minister Rumen Radev broke ground on Bulgaria's first Tesla-equipped battery park in the Tvarditsa industrial zone in Sliven province, alongside Energy Minister Iva Petrova and Innovation Minister Ivan Vasilev. The Tvarditsa Battery Park will have 300 MWh of capacity with a five-hour duration, implying roughly 60 MW of output, and will comprise 80 Tesla Megapack 2XL units and 20 Tesla transformers of 4.4 MVA each. Commercial operation is targeted for the second quarter of 2027.

First of three parks, more than €350 million

Tvarditsa is the first of three battery parks being developed by Bulgarian companies Asarel Trade and Power Profit in cooperation with Tesla. The two remaining parks are planned for Stara Zagora and Veliko Tarnovo, as announced last month by former energy minister Delyan Dobrev. The three-project programme totals more than 2,300 MWh of capacity and over €350 million in value. The government did not disclose the individual capacity, timeline or value of the Tvarditsa project itself.

Energy Minister Iva Petrova said Bulgaria has commissioned more than 6 GW of energy storage capacity in less than one and a half years, which helped supply neighbouring countries during the summer. Prime Minister Radev described Bulgaria as a European leader in battery storage capacity, giving it a competitive edge, and framed the project as evidence of a deepening technological partnership with the United States.

How Tvarditsa compares with other Tesla deals in Europe

Among Tesla's European energy contracts, Tvarditsa is mid-scale but concrete. The NatPower agreement for 25 GWh covering Italy and the UK, and the Zhero agreement for about 3 GWh in Italy, are framework deals covering future projects rather than single built assets. Belgium's Green Turtle is a single 2,800 MWh facility using the newer Megapack 3, due online at the end of March 2028. Tvarditsa is smaller, uses the already-delivered Megapack 2XL, and is set to begin operation nine months to a year earlier.

Five-hour duration as a market signal

The five-hour duration is notable for a Bulgarian project, where much of the recent 6 GW wave has been shorter-duration capacity aimed at solar shifting and evening peaks. Longer duration improves the asset's ability to capture multi-hour price spreads and to provide firming services as the country's solar share grows, though developers still face grid-expansion constraints and narrowing arbitrage spreads across the market.

Source: teslant.com

This article was assisted by AI analysis. Please refer to the original source for official information.