Opposition Leader Bill Shorten and the ALP are missing an opportunity to stamp out discrimination against LGBTI Australians by ruling out removing religious exemptions to the Sex Discrimination Act, the Greens say.

"It's disappointing that just days after Labor released plans for an LGBTI Commissioner, they are locking themselves into supporting discriminatory laws against LGBTI Australians," Greens sexuality spokesperson Senator Robert Simms said.

The Australian Greens urge the Labor party to join them in committing to removing religious exemptions to the Sex Discrimination Act, following Rainbow Labor's announcement to appoint an LGBTI discrimination commissioner.

"While Labor's plan to appoint a LGBTI discrimination commissioner would certainly be a welcome focus on advancing LGBTI rights, we still don't have a clear commitment from the ALP that they will end discrimination against LGBTI people under the law," Greens sexuality spokesperson Senator Robert Simms said.

The Australian Greens are urging Opposition Leader Bill Shorten to back the Greens' push to remove religious exemptions from anti-discrimination laws and protect the rights of LGBTI Australians.

"It seems that while Labor's legal affairs spokesperson Mark Dreyfus agrees with the Greens position that no-one should be discriminated against for their sexuality or gender identity, the jury is still out for Opposition Leader Bill Shorten," Greens sexuality spokesperson Senator Robert Simms said.

Former ALP Senator Don Farrell's return to politics shows now, more than ever, why South Australians needs strong progressive representation in the Senate, Greens marriage equality spokesperson Senator Robert Simms says.

"South Australian voters are faced with a predicament. High-profile candidates on both the ALP and Liberal senate tickets are vehemently against marriage equality. Together with Family First's Bob Day, Cory Bernardi and Don Farrell would work to stymie this progress in the parliament.

Transitioning to a renewable economy and building a solar thermal plant in the mid-north should be prioritised as Port Augusta's coal-fired power stations are today shut down for good, The Australian Greens say.

Greens Senator Robert Simms has said that the choice for voters in South Australia could come down to the Greens or Family First.

"In South Australia, the numbers in the Senate are pretty tight and it looks like it may come down to a race between myself and Family First's Bob Day for that final position," Greens sexuality spokesperson Senator Robert Simms said.

"So for South Australians it's a case of ‘Rob or Bob': the Greens agenda of equality for LGBTI people versus the homophobia and transphobia of Family First.

Greens Sexuality spokesperson Senator Robert Simms has welcomed the approval of PrEP (pre-exposure prophylaxis) by the Therapeutic Goods Administration and called on the Government to now list it under the PBS.

"This is positive development in HIV prevention in our country. The Greens have been advocating for some time for Australians to have access to this effective HIV prevention tool and I'm relieved to see it's finally been granted approval," said Senator Simms.

The Australian Greens are calling on the Government to apologise to Mr Marco Bulmer-Rizzi following revelations of more poor treatment by a government department.

"Mr Bulmer-Rizzi has had his grief compounded by the poor treatment from the government, starting with the failure to name him as next-of-kin on his late husband's death certificate in January," Greens sexuality spokesperson Senator Robert Simms said.

In senate estimates today Attorney-General George Brandis has ruled out seeking a temporary suspension of anti-discrimination laws during any marriage equality plebiscite, in response to questioning from Greens marriage equality spokesperson Senator Robert Simms. But, he left the door open to the Australian Christian Lobby receiving public funds to run a ‘no' campaign.

"The idea of public funds being given to an organisation like the ACL to campaign against marriage equality will horrify all Australians who believe in equality," Senator Simms said.