Elon Musk says companies and governments might need to pay to use Twitter under his ownership, as the billionaire Tesla founder seeks more investors to cover the private financing of his $44 billion takeover deal. The US Fed gets set to hike interest rates, and soaring profits at oil companies spur a push for windfall taxes.

The UK's Electoral Commission says it has launched a formal investigation into the financing of a lavish makeover of Prime Minister Boris Johnson's Downing Street apartment.

Here is why you should pick up a copy of The Guardian on Sunday. Find these stories and much more when you grab a copy of The Guardian on the newsstands on Sunday.⁣⁣ ⁣⁣

The renewable energy company, Arnergy has raised $9million in a Series A round of financing. Femi Adeyemo, co-Founder of Arnergy joins CNBC Africa for more.

Saadia Madsbjerg, managing director at the Rockefeller Foundation, talks about sustainable financing.

A new study has found that many Germans think that there is widespread acceptance for financing government spending through taxes. People in Brazil and Montenegro are far more skeptical about their fellow citizens.