Bayer has signed a long-term power purchase agreement with Wuppertaler Stadtwerke, the municipal utility of Wuppertal, for about 120 GWh of wind and solar power a year. The contract names no wind farm, no solar park and no capacity in megawatts. It names six Bayer sites instead, and it promises that all the electricity Bayer buys for them will be renewable.
Key takeaways
- Wuppertaler Stadtwerke signed a power purchase agreement with Bayer, announced on 19 April 2024, to supply about 120 GWh of electricity a year from solar and wind assets in Germany.
- The WSW contract supplies Bayer sites in Darmstadt, Weimar, Bitterfeld, Bergkamen, Berlin and Wuppertal.
- The 120 GWh a year supplied to Bayer is equivalent to the annual power consumption of about 30,000 households in the region.
- All purchased electricity for the six Bayer sites covered by the contract will come from renewable sources, supporting Bayer's commitment to become climate-neutral by 2030.
- Enerdatics records 50 German PPAs announced in 2024, six of them supplied from a mix of wind and solar, and Bayer's 120 GWh is larger than the disclosed volumes in Nestle's and Novelis' mixed-supply contracts that year.
Why is the contract written in GWh rather than MW?
Because Bayer is buying a volume of electricity for its sites, not the output of a particular plant. Most power purchase agreements tie a buyer to a named wind or solar farm and specify how many megawatts of its capacity the buyer takes. A volume contract instead commits the supplier to deliver a set amount of energy over a year, drawn from whatever renewable assets it has available.
That shifts the work onto the supplier. Wind and solar output rises and falls with the weather, while a chemical or pharmaceutical site draws power steadily. A contract based on volume across a mix of wind and solar leaves Wuppertaler Stadtwerke to match generation with Bayer's demand and to manage the gaps. The record does not disclose the price, the contract length beyond describing it as long-term, or the specific assets behind the supply.
What does covering six sites tell you about the deal?
It tells you the contract is sized to the sites' purchased demand rather than to a plant. The record states that all purchased electricity for these sites will be 100 percent renewable. The 120 GWh a year is therefore effectively the electricity Bayer buys for Darmstadt, Weimar, Bitterfeld, Bergkamen, Berlin and Wuppertal combined.
The household comparison gives a sense of scale. Dividing 120 GWh by 30,000 households implies about 4,000 kWh per household per year, which is the basis of the regional equivalence the parties used.
The word purchased matters. Sites can also generate some of their own electricity, and the record speaks only to what Bayer buys. It does not say what share of the sites' total consumption that represents.
Why sign with a municipal utility?
A Stadtwerk is a German municipal utility, owned by a town or city and supplying local customers with electricity and other services. Contracting with one gives Bayer a supplier that already runs a retail and trading business capable of delivering power to multiple sites, rather than a developer selling the output of a single asset.
It is a departure from how Bayer has bought renewable power elsewhere. Leap records seven PPAs with Bayer as offtaker. Three are with Iberdrola: a 105 MW wind contract in Mexico for 15 years, a 100 MW solar contract in Spain for 10 years, and an 11-year solar contract at Montefiascone in Italy announced in May 2024. The others are with Serena in Brazil, Cat Creek Energy in the US for 1.4 TWh, Alpiq in France for wind, and Wuppertaler Stadtwerke in Germany. The German contract is the only one of the seven signed with a municipal utility.
It was also part of a burst of activity. The Alpiq, Wuppertaler Stadtwerke and Iberdrola Italy contracts were all announced between February and May 2024, three countries in four months.
Enerdatics' data shows 50 German PPAs announced in 2024. Wind accounts for 21 of them, with 4,783.6 GWh a year of disclosed output, and solar for 17. Six draw on a mix of wind and solar, together accounting for 872 GWh a year of disclosed output. Bayer's 120 GWh is about 14 percent of that mixed-supply volume. Among the mixed contracts that disclose a figure, it is larger than BKW's 80 GWh a year for Nestle and Statkraft's 58 GWh for Novelis. Only two of the six disclose a duration: 15 years for Fresenius Medical Care and 10 years for Novelis.
What does the deal signal for German corporate PPAs?
It signals two routes for industrial buyers. One is the asset-backed contract, where a heavy user ties itself to a named plant, as thyssenkrupp Steel did with RWE's Kaskasi offshore wind farm and Salzgitter did with Octopus Energy's Schiebsdorf solar farm. The other is the supply contract Bayer chose, where a utility delivers a renewable volume to multiple sites and carries the shape and balancing risk.
For a buyer with several mid-sized sites rather than one very large load, the second route is simpler. It avoids negotiating separate contracts for each location and leaves the utility to source and firm the power.
For municipal utilities, the deal shows a role beyond local retail supply. A Stadtwerk that can aggregate wind and solar and deliver it across Germany can compete for industrial contracts that might otherwise go to large generators or traders. The open question, as with most German corporate PPAs in Leap, is price: the contract carries no disclosed tariff, so its value to either side cannot yet be measured.
Frequently asked questions
What did Bayer and Wuppertaler Stadtwerke agree? Wuppertaler Stadtwerke signed a long-term power purchase agreement with Bayer, announced on 19 April 2024, to supply about 120 GWh of electricity a year from solar and wind assets in Germany.
Which Bayer sites does the WSW contract cover? The contract supplies Bayer sites in Darmstadt, Weimar, Bitterfeld, Bergkamen, Berlin and Wuppertal. All purchased electricity for these sites will come from renewable sources.
Why did Bayer sign the WSW power purchase agreement? The contract is part of Bayer's global strategy for sustainability and CO2 footprint reduction, and supports its commitment to become climate-neutral by 2030.
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