* Property firms count on rising student housing demand

* Shortage of 500,000 student housing beds in South Africa

* Growthpoint to up number of beds by 20% to nearly 9,000

JOHANNESBURG, Aug 16 (Reuters) - South Africa's largest property company Growthpoint will invest around 1.2 billion rand ($63 million) in student housing by 2026, as it counts on rising demand from the sector to partly offset a slump in other areas.

South Africa's student housing sector has a shortfall of up to 500,000 beds in the formal sector, according to a 2021 International Finance Corporation report, drawing interest from deep-pocketed real estate firms.

"I think what's important to understand is that it's a lack of institutional-type of accommodation," George Muchanya, head of the company's Growthpoint Investment Partners unit, told Reuters on Tuesday.

The investment comes at a time when the listed South African real estate sector, categorised as real estate investment trusts (REITs), is under pressure to maintain dividends as the trend towards home-working leaves acres of office space empty.

The impact was felt more in South Africa as hours of power blackouts every day forced REITs to funnel billions of rand into generators to keep the lights on.

Since the pandemic, 100 rand invested in South Africa's benchmark index would be worth 200 rand today, but only 143 rand if invested in the listed property sector.

Growthpoint, which launched a dedicated fund for student housing last year, will aim to increase the number of its beds by over 20% to 8,800 by the end of 2024, Muchanya said, adding a further increase would happen the following year.

The investment will expand the value of its portfolio to 4 billion rand in 2024, up from 3 billion rand at the end of June. It currently owns 10 student accommodations in Johannesburg, Pretoria and Cape Town. ($1 = 19.1292 rand)

(Reporting by Tannur Anders Editing by Promit Mukherjee and Mark Potter)