What Alter Enersun does

Alter Enersun S.A. is a Spanish renewable energy developer and independent power producer (IPP) founded in 2009 and headquartered in Badajoz, Spain. The company develops, finances, builds, and operates photovoltaic solar plants — both ground-mounted utility-scale projects and rooftop self-consumption installations — alongside battery storage and (more recently) wind assets, with operating capacity of 290+ MWp distributed across more than 150 installations in Spain, Portugal, Italy, and Mexico. Its core technology stack includes an in-house control platform and Operations & Maintenance Center for real-time monitoring of distributed assets, plus increasing hybridization of solar with battery storage (1,000 MWh planned across Andalusia and Extremadura, 2025-2028). Major operational assets include the La Luz solar park (262 MWp, 537 GWh/year, completed 2024 in Huelva), Huelva 2020 and Huelva 2021 (50 MW each), Kambul in Mexico (38 MWp), and a 25-year PPA for a 30 MWp self-consumption plant at Atlantic Copper's metallurgical complex.

The company makes money through three primary streams. First, as an IPP, Alter sells electricity to the grid and to large industrial off-takers under long-term PPAs (e.g., 25-year Atlantic Copper deal, regulated Spanish renewable auction capacity won in 2017). Second, its group subsidiary Alterna Energía delivers customized self-consumption photovoltaic solutions to industrial customers. Third, Max Energía, another subsidiary, markets electricity and natural gas to more than 11,000 industrial, institutional, and community customers, supplying 300+ GW cumulatively. Distribution is primarily direct enterprise sales to large energy-intensive industrial buyers in Huelva and Andalusia (metallurgy, chemicals, energy-intensive manufacturing), supplemented by public-sector tenders and co-development joint ventures. The Enalter JV with Enagás Renovable (partnering alongside Masdar in Moeve's €3B Andalusian Green Hydrogen Valley) and the Bruc Alter JV with Bruc Energy (550 MW pipeline) are the company's two principal co-development vehicles, allowing it to participate in flagship projects with reduced balance-sheet exposure while positioning as a renewable feedstock supplier into the green hydrogen ecosystem.

Name

Alter Enersun

Legal name

Alter Enersun S.A.

Website

https://alterenersun.com

Company type

Private

Founded year

2009

Operating status

Operating

Headcount range

11–50 employees

Short description

Alter Enersun is a Spanish renewable energy IPP that develops, finances, and operates photovoltaic solar plants, battery storage, and wind assets, supplying long-term PPAs to large industrial off-takers and green hydrogen projects across Spain, Portugal, Italy, and Mexico.

Ownership category

akta.pro rank

Product category

Solar Power Generation and Renewable Energy Services

NAICS

Solar Electric Power Generation (221114), Electric Power Generation (22111), Wind Electric Power Generation (221115), Electric Power Generation, Transmission and Distribution (2211)

akta.pro primary industry

Utility-Scale PV EPC (Engineering, Procurement & Construction) (EUACAGAB)

akta.pro secondary industries

Wind Power Plant EPC (Onshore/Offshore) (EUAEAAAF), Reactive Power & Power Quality Systems EPC (STATCOM/SVC, Harmonic Filters, Capacitor Banks) (EUAEADAF), Electrical Balance-of-Plant EPC (MV Collection, Cabling, Earthing, Lighting) (EUAEADAB), Transmission Interconnection & Line Works (Gen-Tie Lines, Overhead/Underground Lines) (EUAMAFAF)

Keywords

• Photovoltaic solar generation
• Power purchase agreements
• Renewable energy projects
• Industrial self-consumption
• Green hydrogen supply

Headquarters

HQ city

Badajoz

HQ country

Spain

HQ region

Europe

Offices4 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Infrastructure, Operations, Supply Chain, Personnel, Technology or R&D, Marketing or Sales

Revenue model

1. Power Generation and Sale (IPP Model): Alter Enersun develops, finances, and operates its own photovoltaic installations for the sale of electricity to the grid, utilities, or through PPAs. This is the primary revenue stream, with installed capacity distributed across Spain, Portugal, and Mexico. Revenues are recurring based on long-term PPAs and regulated tariff auctions.
2. Industrial Self-Consumption Solutions: Customized photovoltaic solutions for industrial customers (e.g., 30 MWp plant for Atlantic Copper under 25-year PPA). Revenue generated through long-term PPAs with industrial off-takers, providing stable contracted income.
3. EPC (Engineering, Procurement and Construction) Contracts: Construction of solar plants under EPC contracts for third parties and group companies (e.g., construction of Huelva 2021 through GES). One-time project revenue.
4. Energy Marketing (via Max Energía): Group company Max Energía supplies electricity and natural gas to more than 11,000 industrial, institutional and community customers, with planned supply of more than 300 GW of energy.

Go-to-market motion2 records

Distribution channels4 records

Marketing channels5 records

Core offering

Alter Enersun develops, finances, constructs, and operates photovoltaic solar power plants as an Independent Power Producer (IPP), selling electricity through long-term Power Purchase Agreements (PPAs) to industrial customers and to the grid. The company also delivers turnkey solar self-consumption installations for industrial and public-sector clients, executes EPC contracts through its group, and supplies renewable energy into the green hydrogen value chain in Spain.

Product overview

Alter Enersun is a renewable energy company founded in 2009, specializing in photovoltaic solar energy development, financing, and operation. The company operates through three divisions: Alter Enersun (IPP developing, financing, and operating renewable generation assets), Alterna Energía (self-consumption and grid generation solutions), and Max Energía (energy marketing). The portfolio includes large-scale ground-mounted solar parks (La Luz at 262 MWp, Huelva 2020/2021 at 50 MW each), port-based installations for green hydrogen supply (Puerto La Luz, V. de los Castillejos Solar), wind energy projects, battery storage systems (62 MWh in Extremadura), and industrial self-consumption solutions via PPAs. The company is present in Spain, Portugal, and Mexico with over 150 installations.

Differentiator

Problem solved

Functional benefit

Products and services

• Photovoltaic Power Generation (IPP) Generation and sale of electricity from owned and operated photovoltaic plants to utilities, the grid, or industrial off-takers via long-term PPAs and renewable auction tariffs.
• Industrial Self-Consumption PPA Solutions Customized PV installations designed for industrial customers, financed and built by Alter Enersun on or near the customer's site, with electricity supplied under a long-term PPA.
• EPC Construction Services Engineering, Procurement and Construction (EPC) services for utility-scale photovoltaic plants, provided for third-party developers and within the group via GES.
• Max Energía Energy Marketing Wholly-owned subsidiary that supplies electricity and natural gas, plus energy services, to more than 11,000 industrial, institutional, and community customers.
• Alterna Energía Self-Consumption Solutions Subsidiary delivering comprehensive, customized photovoltaic self-consumption projects for industrial and commercial clients, with over 400 executed projects.
• La Luz Solar Park Largest PV project in the company's history: eight interconnected plants in Huelva with 262 MWp capacity producing 537 GWh/year for 154,000 households, avoiding 507,000 tonnes of CO2 vs. coal.
• Huelva 2020 Photovoltaic Plant 49.9 MWp ground-mounted PV plant in Gibraleón covering 85 hectares with 135,056 solar panels, producing 95 GWh/year and powering more than 27,000 homes.
• Huelva 2021 Photovoltaic Plant 50 MWp photovoltaic plant in Huelva with 113,686 solar panels producing 100 GWh/year, equivalent to consumption of 28,000 households.
• Kambul Photovoltaic Project (Mexico)

Quantifiable outcome

• 507,000 tonnes of CO2 avoided per year by La Luz project (compared to conventional coal)
• +5 more outcomes

Named customers8 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Eight partnerships are on record, tiered core, key account, regional, flagship, operational and minor.

• Enagás RenovablecoreStrategic or Co-development Partner · 2 March 2026Enalter is a joint venture between Enagás Renovable and Alter Enersun, holding a minority stake in Moeve's Andalusian Green Hydrogen Valley project in Huelva (alongside Masdar of Abu Dhabi). Alter Enersun contributes renewable energy supply capacity to the hydrogen ecosystem. The JV was awarded €303 million in NextGenEU funding.
• Bruc EnergycoreStrategic or Co-development Partner · 1 January 2021Partnership creating the joint venture Bruc Alter (55% Bruc / 45% Alter Enersun) to develop 550 MW of photovoltaic solar energy across Andalusia and Extremadura. The first investment was Huelva 2021 (50 MW).
• Atlantic Copperkey accountStrategic or Co-development PartnerStrategic 25-year PPA for the development and construction of a 30 MWp photovoltaic plant for self-consumption at Atlantic Copper's metallurgical complex in Huelva. Investment of €16 million by Alter Enersun. Represents one of Spain's most important industrial self-consumption developments.
• Firstrule (Portugal)regionalStrategic or Co-development PartnerJoint venture ENERSUN LDA with Portuguese company Firstrule for the development, construction, and operation of rooftop photovoltaic installations in Portugal, extrapolating Alter's experience into the neighboring market.
• Masdar (Abu Dhabi)flagshipStrategic or Co-development PartnerMasdar of Abu Dhabi is a minority partner alongside Enalter (Alter Enersun/Enagás Renovable JV) in Moeve's Andalusian Green Hydrogen Valley first phase, following €303 million NextGenEU funding award. Total project investment exceeds €3 billion for up to 300,000 tonnes of green hydrogen annually.
• GES (Grupo Energético Solarc)operationalImplementation/ SI/ Consulting PartnerGES is responsible for EPC (Engineering, Procurement and Construction) of Alter Enersun's large photovoltaic projects, including Huelva 2021 and La Luz. GES has 25 years of experience, has built over 7 GW globally, and is part of the same entrepreneurial group as Alter Enersun.
• Cooprado (Cooperativa Nuestra Señora del Prado)minorStrategic or Co-development PartnerCollaboration agreement to integrate livestock grazing within Alter Enersun's solar plant sites and co-develop renewable energy projects supporting the local agricultural economy in the Casar de Cáceres region.
• Cepsa (now Moeve)flagshipStrategic or Co-development PartnerCepsa (now Moeve) is leading the Andalusian Green Hydrogen Valley in Huelva, with Alter Enersun participating through its Enalter JV as a minority partner providing renewable energy supply. The first phase involves €1 billion investment in 300 MW electrolyzer and new solar/wind capacity.

Scale indicators11 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Enel Green Power: Global renewable IPP arm of Enel Group, with a large Iberian and Latin American solar/wind portfolio and integrated hydrogen ambitions. Comparable as a broad incumbent in the same geographies and end-markets as Alter Enersun, with a similar industrial PPA and hydrogen strategy.
• Statkraft: Norwegian state-owned renewable IPP with significant Iberian and European wind/solar operations and active involvement in green hydrogen projects. Comparable to Alter Enersun as a broad incumbent in European renewable generation with overlapping hydrogen ambitions.
• Acciona Energía: Global renewable IPP spun out of Acciona, with significant Iberian wind and solar generation and an industrial PPA franchise. Comparable as a broad incumbent Spanish renewable platform with overlapping solar/wind development and PPA capabilities.
• BayWa r.e. German-headquartered global renewable energy developer, IPP, and energy solutions provider with significant European solar and wind activity. Comparable to Alter Enersun in integrated development-EPC-IPP model and focus on industrial/C&I renewable supply.

Direct peers

• Sonnedix: European solar IPP owned by JP Morgan, with a multi-GW operating and development portfolio concentrated in Italy, Spain, Portugal, and other EU markets. Highly comparable to Alter Enersun in pure-play solar IPP model and Iberian/Italian footprint.
• Encavis AG: Frankfurt-listed European solar and wind IPP operating across multiple EU countries. Comparable to Alter Enersun in pure-play renewable IPP strategy, multi-country European footprint, and reliance on long-term PPAs and regulated revenues.
• Solaria Energía y Medio Ambiente: Madrid-listed Spanish utility-scale solar PV developer and IPP with multi-GW pipeline across Iberia — directly comparable to Alter Enersun in business model (development → EPC → IPP), customer base (industrial PPAs, public tenders), and Iberian market focus.
• EDP Renováveis: Iberian-headquartered (and partially Spanish-origin) wind and solar IPP operating globally. Closely comparable to Alter Enersun as an Iberian renewable IPP with multi-country presence, PPA origination capability, and integration with green hydrogen initiatives.

Others

• Iberdrola: Global Spanish-headquartered utility with one of the world's largest renewable generation fleets and an aggressive green hydrogen roadmap. Comparable as a broad incumbent operating across the same Spanish grid, industrial customers, and hydrogen ecosystem that Alter Enersun serves.

Emerging players

• Audax Renovables: Iberian renewable energy generator and energy retailer (electricity and gas to thousands of customers) — directly comparable to Alter Enersun/Max Energía's combined IPP-plus-retail model and to its Spanish SME/institutional customer base.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/alter-enersun-sa

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries5 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Alter Enersun