UK Solar Roadmap 2025: Key Government Actions & Solar Targets |Alternergy

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What Is the UK Solar Roadmap 2025?


The UK Government has published its long-awaited Solar Roadmap 2025, outlining how it plans to increase solar capacity to 45–47 GW by 2030, up from nearly 19 GW as of May 2025. This target forms part of the wider Clean Power Action Plan, which aims to fully decarbonise the electricity system by the end of the decade.

Solar is already on the rise, with over 1.5 million homes using rooftop panels and annual installations growing by 10% or more in recent years. Rooftop solar is now one of the most accessible and cost-effective clean energy options for UK households and businesses.

Produced in collaboration with industry, the roadmap provides a clear strategy to support solar deployment across domestic, commercial, and utility-scale projects.

The Roadmap sets out over 70 actions to tackle persistent barriers to solar deployment, such as planning, grid access, real estate constraints, and supply chain challenges. Key focus areas include:

  • Mandatory solar on new homes from 2025
  • £13.2 billion Warm Homes Plan to support domestic solar, heat pumps, and batteries
  • Grid and planning reform to speed up connections and approvals
  • Support for UK manufacturing, skills, and ethical supply chains
  • Incentives for commercial rooftop and public sector deployment

A newly created Solar Council will oversee delivery. While the roadmap is ambitious, with potential for up to 85 GW by 2035, many proposals still lack detail. Challenges like limited export revenues and regulatory complexity remain unresolved.

Nonetheless, the Roadmap signals that solar is central to the UK’s clean energy future, with the potential to cut energy bills, attract investment, and drive decarbonisation at scale.

 

Overview of the UK Solar Roadmap 2025 Action Areas

The UK Government’s Solar Roadmap sets out over 70 actions (*) to accelerate solar deployment and meet its target of 45 to 47 GW by 2030. These actions are grouped into seven key thematic areas, with a supporting set of annexed actions to address future opportunities:

  • Rooftop Solar (Actions 1 to 10): Focused on scaling rooftop solar across homes, commercial buildings, schools, and hospitals. Includes mandates for new builds and retrofit support.
  • UKWA / Industry (Actions 11 to 14): Tackles legal, financial, and leasing barriers to unlock solar on commercial and public sector buildings.
  • Grid & Networks (Actions 15 to 29): Aims to speed up grid connections, manage connection queues, and increase hosting capacity for solar projects.
  • Supply Chain & Innovation (Actions 30 to 37): Supports UK-based manufacturing, innovation, and ethical procurement to build a resilient solar supply chain.
  • Skills & Workforce (Actions 38 to 48): Addresses workforce shortages through training, apprenticeships, and fair work practices.
  • Planning & Land Use (Actions 49 to 54): Reforms planning rules for large-scale solar and promotes dual land use approaches like agrivoltaics.
  • Collaboration & Delivery (Actions 55 to 62): Ensures coordination between government, industry, and local authorities through the new Solar Council.
  • Annexed Actions (63 to 72) are not a separate theme but rather support and expand on the main areas. These often cover future plans or topics still under development.

(*) You can view the full action list in Appendix 1 of the Solar Roadmap 2025.


Short-Term Priorities: Rooftop Solar, Networks and Commercial Solar

Rooftop Solar, Networks, and UKWA/Industry contain the most critical short-term enablers in the roadmap. These areas combine regulatory reform, market facilitation, and direct investment to unblock solar deployment by 2025 to 2026.

Rooftop Solar in the UK Solar Roadmap

The UK Solar Roadmap prioritises rooftop solar as a cornerstone of clean energy expansion, with three key short-term actions set to drive rapid progress.

Future Homes Standard (Action 6)
From 2027, most new homes in England will be required to include rooftop solar, under the Future Homes Standard due for publication in autumn 2025. Systems must cover at least 40 percent of a building’s floor area where feasible. This is expected to save homeowners around £530 per year on energy bills and significantly cut emissions from day one.

Future Buildings Standard (Action 9)
A parallel standard for commercial buildings is also expected this autumn. The policy aims to mandate rooftop PV on new retail, warehouse, and office developments, supporting growth in commercial solar deployment.

Warm Homes Plan (Action 3)
As part of the £13.2 billion Warm Homes Plan, the UK Government will support solar PV installations for existing homes, including social housing, alongside heat pumps, batteries, and insulation. Full funding details and delivery guidance are expected in autumn 2025. A separate consultation will explore new Minimum Energy Efficiency Standards for social housing, where solar is expected to play a key role in compliance.

Together, these measures represent a major shift. They embed solar not only in new build requirements but also as a core part of retrofit and social housing upgrade programmes.

 

UKWA / Industry: Unlocking Public and Commercial Rooftop Solar

Action 13 commits to installing solar panels on around 200 schools by 2025 to 2026, co-funded by Great British Energy and the UK Government. This highly visible rollout will cut energy bills and emissions while demonstrating public sector leadership.

Actions 10 to 12 address the legal and financial barriers holding back commercial rooftop solar. These include complex leasing terms, Power Purchase Agreements (PPAs), and landlord–tenant responsibilities. Despite strong demand for clean energy, uptake on warehouses, offices, and retail buildings remains low.

To help solve this, the roadmap supports collaboration with the UK Warehousing Association (UKWA) to develop standardised contracts and guidance. UKWA research shows the top 20 percent of UK warehouses could host up to 15 GW of rooftop solar, nearly doubling the UK’s current installed capacity. Source: UKWA/Delta-EE Report

With rising energy costs and the potential for new revenue through battery storage and corporate PPAs, unlocking this space offers a major opportunity. These short-term actions could rapidly scale rooftop solar across the public and commercial sectors, supporting the UK’s 2030 clean energy targets.

 

Grid Connections: Addressing Connection Challenges

Grid access remains one of the biggest challenges to scaling solar in the UK. The Solar Roadmap outlines key reforms to speed up connections and unlock more capacity.

Action 15 introduces queue management reforms to prioritise ready-to-build projects and remove speculative applications. Action 16 supports this with an Ofgem-led End-to-End Review to streamline the entire grid connection process.

A new Fast Track G99 process allows small solar systems under 14.72 kW to get grid connections in just 10 days, significantly speeding up installs for homes and small businesses.

Larger commercial projects will benefit from Actions 23 and 24, which tighten regulation of Independent Distribution Network Operators (IDNOs) to ensure fair and consistent access.

Other important reforms include reviewing transformer charging rules to unlock capacity at transmission substations (Action 18), promoting flexible connection offers with storage or export limits (Action 19), and ensuring rooftop solar is factored into national and regional grid planning (Action 26). Action 27 will improve transparency around available grid capacity by clarifying what connection data is commercially sensitive.

 


High-Impact Long-Term Actions for UK Solar Growth

While the roadmap identifies several top-priority actions for immediate implementation, others, particularly those targeting grid reform, financing models, and supply chain resilience, are likely to have a greater impact over the medium to long term.

Grid Reform: Unlocking Capacity

Without faster, smarter grid access, solar deployment will stall. Key actions include:

  • Raising the TIA (Transmission Impact Assessment) threshold from 1 MW to 5 MW to fast-track mid-sized projects
  • Reforming the connection process to reduce delays and increase transparency
  • Easing planning for low-voltage upgrades like long wooden pole routes

 

Rooftop Solar on Commercial and Public Buildings

The top 20 percent of UK warehouses alone could host 15 GW of solar. Key actions include:

  • Standard leasing and PPA contracts for rooftop deployment
  • Co-funded solar on 200 schools and 200 hospitals
  • Planning reform to enable rooftop and solar carports

 

Future Homes Standard

By 2027, new homes will be required to include rooftop solar. This embeds clean energy into housing design and reduces bills from day one.

Supply Chain and Skills

Scaling solar requires skilled workers and resilient supply chains. Key actions include:

  • A national skills gap analysis and new training programmes
  • Support for UK manufacturing of solar components
  • Ethical sourcing standards to eliminate forced labour
  • New “fair contract” models to retain qualified installers

 


The Best of the Rest: Supporting and Strategic Actions

Beyond the headline reforms, the Roadmap includes a number of supportive and future-looking measures.

1. Consumer and Community Engagement
  • New financial products to lower upfront costs
  • Community benefits for those living near solar farms
  • MCS-led protections for consumers and quality assurance

 

2. Grid Flexibility and Market Design
  • Improved access to flexibility markets for solar and storage
  • A review of the Smart Export Guarantee to ensure fair payments
  • Ofgem review of IDNO rules to ensure consistent grid access

 

3. Smarter Land Use and Planning
  • Grey space solar on rooftops and car parks, especially in schools and hospitals
  • Planning changes so only projects over 100 MW need national consent
  • Support for agrivoltaics and dual land use strategies

 

4. Supply Chain and Industry Standards
  • A new UK supply directory to help installers source locally
  • Best practice guidelines for fair contracts and worker retention

 

5. Innovation and New Technologies
  • Floating solar projects supported through CfD (Contract for Difference) auctions
  • Consultation on mandatory solar carports for new outdoor parking
  • Safety review of plug-in solar systems for balconies and gardens

 

6. Public Investment and Social Housing
  • Over 200 schools and 200 hospitals to receive co-funded rooftop solar
  • Standards and incentives to bring solar to social housing tenants

 



Turning Plans into Delivery

The UK Solar Roadmap marks an important step forward in accelerating solar deployment. However, its success will depend on how well these actions are delivered on the ground.

While the Roadmap signals strong intent, the real test lies in translating these actions into delivery. Success will depend on sustained collaboration across government, industry, and local stakeholders, as well as a willingness to address the tougher, unresolved challenges facing developers. Solar is now firmly part of the UK’s energy future. What matters next is making it work.

 

➔ At Alternergy, we stock everything UK installers need to deliver solar projects aligned with the UK Solar Roadmap - from roof-integrated panels to high-efficiency solar modules, solar battery storage, and inverter solutions for commercial and domestic systems.

 

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Frequently Asked Questions
What is the UK Solar Roadmap 2025?

The UK Solar Roadmap 2025 is a government strategy outlining over 70 actions to increase solar capacity to 45–47 GW by 2030, including planning reform, rooftop mandates, grid upgrades, and supply chain support.

Will solar panels become mandatory on new homes in the UK?

Yes. From 2027, most new homes will need rooftop solar under the Future Homes Standard, covering at least 40% of a building’s floor area where feasible.

What support is available for solar panels in existing homes?

The £13.2 billion Warm Homes Plan will support solar PV alongside batteries and heat pumps for existing homes, including social housing. Full details are due in late 2025.

What are the grid reforms in the Solar Roadmap?

Key reforms include faster grid connections, queue management, flexible connection offers, and improved transparency on grid capacity.

How will the roadmap affect commercial buildings?

The roadmap supports rooftop solar on commercial properties through standardised leasing, Power Purchase Agreements (PPAs), and co-funding for public buildings like schools and hospitals.

Is the UK on track to meet its 2030 solar targets?

As of 2025, the UK has nearly 19 GW of installed capacity. Reaching 45–47 GW by 2030 will require rapid policy delivery and investment in rooftop, grid, and supply chain actions.