0414 GMT March 22, 2019
Nicola Shaw, its executive director, said technological advances will reduce the need to build new conventional power stations in the UK, according to BBC.
An 'internet of energy' will allow fridges, washers and dishwashers to help balance energy demand.
Some commentators said the UK needs more gas-fired power to prevent blackouts.
Shaw agreed that more investment in gas-fired power was needed, but argued that between 30 percent and 50 percent of fluctuations on the electricity grid could be smoothed by households and businesses adjusting their demand at peak times.
"We are at a moment of real change in the energy industry. From an historic perspective we created energy in big generating organizations that sent power to houses and their businesses. Now we are producing energy in those places — mostly with solar power," she said.
London-listed National Grid runs electricity and gas networks in the UK and the northeastern US.
Shaw said, "More and more people and companies were adjusting their energy consumption to use more when power was at its cheapest.
"All of that is a real revolution … a smart energy revolution that's changing the way we think about energy across the country."
This change was being driven by people and firms generating energy, storing it and using it flexibly through new controls and online software.
The move toward flexible energy use is supported by the National Infrastructure Commission. And the advances in energy software are described by the World Energy Council as the biggest change in 21st Century energy — along with solar power.
Price signals to consumers will be key to the change, as the UK relies on increasing amounts of intermittent renewable energy.
Already some firms benefit from using extra power when it is cheaper off-peak.
That trend is spreading to households: A firm in Cornwall is offering a 'sunshine tariff' that aims to persuading households to use cheap solar power when the Sun is out, for example.
Energy experts said that in future consumers will be able to ask for their appliances to be connected online to the grid.
A signal could then turn on, said, a washing machine, when there was plentiful energy from wind power, or turn off a freezer for a few minutes to smooth out a spike in demand at teatime.
Phil Taylor, professor of energy systems at Newcastle University, said: "People are used to the idea that they pay more for using the trains at peak time, or they queue more if they use the roads at rush hour.
"Technology has enabled us to bring this price flexibility to energy consumers. No-one will be forced to link their home to the energy internet, but if they do choose to use it, it will save them money, save pollution and save power stations needing to be built."
The challenge for National Grid is to attract more companies to adopt what is known as 'demand-side response', or DSR.
Some firms are nervous, others have not heard of it — and business models are changing at breakneck speed.
Shaw acknowledged that some were anxious about the lights going out as the smart energy revolution progressed.
However, she said: "I don't think people should fret. There's an awareness of the issues. There's lots of activity on the market that will solve this problem. Be enthusiastic — it's a moment of change that should take us to a better place."
The big questions are how far smart technology can ease the burden on the grid and how quickly it can make its mark.
Deepa Venkateswaran, from Bernstein energy analysts, said: "The smart grid revolution is going to be exciting. However, there's a time frame — we need some time to get wired up and respond dynamically, but in the short term we need new gas stations to replace some of our aging coal stations which are going to close."
Shaw agrees with the need for new gas power, but is wary of committing to new power stations while technology is producing unexpected improvements at a sharp pace.
The issue is central to the UK's laws on cutting greenhouse gases. Under Venkateswaran's scenario, the UK will be locked into generating gas-fired electricity until well into the 2030s.
This would wreck the government's target of ending gas-fired generation in the early years of that decade.
Ministers are working on a long-term climate strategy, which was promised for last November but is now not expected until sometime before the end of this year.
The pressure is on the new Department for Business, Energy and Industrial Strategy to devise policies that will both keep the lights on, bills affordable — as well as carbon emissions down.