Stuart Evans: Green Cement and Vinod Khosla

Stuart Evans: Green Cement and Vinod Khosla

By Alison van Diggelen, host of Fresh DialoguesStuart Evans Fresh Dialogues interview

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Vinod Khosla, the green investment guru, was asked to name the company with the greatest chance of becoming the next Green Microsoft  while onstage at the GoingGreen Conference in Sausalito.  He declined to name his “favorite child” but did praise Calera, the green cement maker he’s backing; and spoke about the huge potential growth in this sector. Since cement production creates 2.5 billion tons of CO2 annually,  representing  5% of manmade sources, it offers great potential in both climate change impact and market opportunity.

I caught up with Stuart Evans, Chairman of Novacem, who shares Vinod’s bullishness about the market for green cement. This British entrepreneur has assembled a team from Imperial College, London (he dubs it the MIT of  the UK) and claims to have invented a carbon negative cement.


How does Novacem technology differ from Calera’s?

“The big play at Calera is that they want to go next to power stations to absorb the carbon dioxide there (carbon sequestration)… We’re making cement without a carbonate based feedstock. Vinod was talking about his materials being used in aggregate applications; we’re really replacing Portland Cement…we’re in the same space, we’re not head to head…we’re possibly even complementary. Besides, in a 2.5 billion (volume/ $150Billion) market, there are room for a couple of players…”

Fresh Dialogues Interviews at GoingGreen Conference 2009


Why is Novacem carbon negative?

“Our cement doesn’t emit carbon dioxide, it absorbs carbon dioxide. We start with the material magnesium silicate (not calcium carbonate)… they have no carbon in them,  so right there we’ve got a stunning advantage. We only work at 800 degrees centigrade (compared to Portland Cement which requires 1400 degrees) so the energy sources we can use include biomass fuels which have a much greener footprint. ..We add a magic sauce to it (a mineral additive) which means that the cement absorbs carbon dioxide rather rapidly.”

The importance of team

“The team is everything; money is important but the team is even more important.”

Vinod Khosla and Tony Perkins, at GoingGreen 09 -Fresh DialoguesOn Vinod Khosla’s expertise

“We are tremendously flattered that Vinod is following our lead and investing in green cement.” (A display of typical British humor here)

 For more Fresh Dialogues interviews and transcript with Vinod Khosla, click here




For other interviews recorded at the conference:

Tony Perkins of AlwaysOn

David Chen of Morgan Stanley







The interview was recorded at the GoingGreen Conference, Sausalito on September 15, 2009. The background Fresh Dialogues interviews at Cavallo Point, Sausalitosound you hear is nautical ‘music’ from buoys, as container ships make their way under the Golden Gate Bridge.

For more info on Green Cement, check out these links


The Next Big Future