The government has written to clean energy developers and investors urging them to "build it in Britain" ahead of a major Future of Energy Security summit.
The two-day summit in London kicks off today, bringing together governments and energy industry leaders from around the world.
Ahead of it, Sir Keir Starmer has brought forward an initial £300million investment through GB Energy to help win global offshore wind investment for the UK.
And Energy Secretary Ed Miliband, Business Secretary Jonathan Reynolds, the Minister for Investment Baroness Poppy Gustafsson, National Wealth Fund CEO John Flint and Great British Energy Chair Juergen Maier have also written to clean energy developers and investors inviting them to invest here in Britain.
The open letter states: "We want to ensure you are aware of the steps the UK government is taking to make the UK one of the top global destinations for clean energy investment.
"As part of our Industrial Strategy, the UK government is taking a series of steps to break down the barriers to growth and investment.
"Today, we are fast tracking an initial £300million public investment in domestic offshore wind supply chains through Great British Energy. This will deploy grant funding to key supply chain projects across the fixed and floating offshore wind sector, supporting the domestic manufacture of critical and innovative components.
"A key goal will be to crowd in private sector investment to deliver maximum impact. This significant fund demonstrates our commitment to supporting UK supply chains: it is intended to provide industry with the confidence to boost UK investment and will support thousands of additional jobs."
It concludes: "In all of us, you will find the most willing partners, united in our belief that in this uncertain world, the UK represents the best place to do business and to capitalise on the enormous opportunities offered by the clean energy transition and our modern Industrial Strategy.
"As the key representatives of this country’s commitment to support investment in clean energy, we felt there was no more appropriate moment to invite private sector partners to come and invest in the UK. Our teams will be in touch about how we can work more together."
Announcing the bringing forward of the £300million investment, the prime minister said: "Delivering the Plan for Change means winning the race for the clean energy jobs of the future, which will drive growth and help us reach clean power by 2030.
"That is why I am bringing forward much-needed investment in our domestic offshore wind supply chains, strengthening our security and creating good jobs for our welders, electricians, and engineers.
"Let my message to the world go out: come and build the clean energy future in Britain."
Dan McGrail, interim CEO of Great British Energy, said: "Great British Energy will help the UK win the global race for clean energy jobs and growth by investing in homegrown supply chains and ensuring key infrastructure parts are made here in Britain.
"We will work closely with businesses across the clean energy sector to get funding out as fast as possible and get projects off the ground."
FTSE 100
The UK's flagship share index, the FTSE 100, was down 32-points at 8,403 shortly after opening this morning.
Brent crude oil futures were down 0.83%, trading at $65.58 a barrel.
Companies reporting today
Alphabet* - Q1 Results
AJ Bell - Q2 Trading Statement
Anglo American - Q1 Production Report
ASOS* - Half Year Results
Indivior - Q1 Results
Inchcape - Q1 Trading Statement
Jupiter Fund Management - Q1 Trading Statement
Molten Ventures - Full Year Trading Statement
Nestle* - Q1 Results
PepsiCo* - Q1 Results
RELX* - Q1 Trading Statement
St James's Place - Q1 New Business Announcement
Unilever* - Q1 Trading Statement
Weir Group - Q1 Results