India Switches On a 2,500 MW Solar Grid Link, Australia's Rooftops Hit 17.5 GW, and

The week in 120 words

Australia's rooftop panels pushed a national record of 17,488 MW on 11 October. India's POWERGRID put a 2,500 MW transmission scheme for the Bidar solar zone into commercial operation on 5 October. A regulator in Chhattisgarh approved a ₹2.98 per kWh price for a 125 MW/500 MWh battery. China finished starting up a 700 MW salt-cavern air storage plant. The hard part this week: India's battery pipeline has a long record of tenders that never get built. Pakistan's solar plants generated 36.3 TWh in 2025, more than its record 22.5 TWh from nuclear, according to the World Nuclear Industry Status Report 2026. The report says the solar figure is probably an undercount because private rooftop systems are unregistered.

INDIA

A regulator signs off a battery price: ₹2.98 per kWh for 500 MWh

The Chhattisgarh State Electricity Regulatory Commission approved a tariff of ₹2.98 per kWh (about 3.1 US cents) for a 125 MW/500 MWh standalone battery. Shreyas Energy 1 won it in a reverse auction on 11 March 2026, one of 13 prospective bidders. The order is dated 1 October and was published on 6 October. Chhattisgarh qualifies for ₹90 crore ($9.4 million) of central viability gap funding. The plant must be commissioned within 18 months of contract signing on 7 May 2026, so the real test lands around late 2027. An approved tariff is a decision. A running battery is a result.

POWERGRID commissions the Bidar solar-zone transmission scheme

POWERGRID told stock exchanges that the 2,500 MW Bidar Solar Energy Zone scheme in Karnataka entered commercial operation on 5 October. It was built under the competitive tariff route. The filing does not state cost or voltage. For scale, India added 44.61 GW of solar in FY2025-26 (MNRE, April 2026), so this link can carry about 5.6% of one year's solar additions. Lines usually trail panels, which is why a finished evacuation route matters. This is a company disclosure and we have not seen independent confirmation.

UltraTech reports 2 GW of captive green power at its cement plants

UltraTech Cement says it now has 2,024 MW of captive green capacity: 1,580 MW of solar and wind plus 444 MW of waste-heat recovery. The company says this meets about 48% of its power needs and that nearly a third of its 76 Indian units run on more than 50% green electricity. Waste-heat recovery is efficiency rather than renewable generation, and "first Indian cement company" is the company's own claim. Cement's larger emissions problem sits in the kiln, from limestone chemistry and fuel, and electricity does not touch that.

A sodium-ion cell claims 1,500 cycles, unverified

Macsen Energy, an Indian startup, says a sodium-ion cell with a Prussian white cathode passed 1,500 charge cycles and kept 90% of its capacity after 1,000. The cathode material is quoted at over 150 mAh/g. These are company lab results. The company disclosed no test conditions, no energy density and no third-party verification, and most figures describe the cathode rather than a commercial cell. A cathode plant is planned to start construction in 2027, with the location undisclosed. Treat it as a promising lab claim until someone else repeats it.

Ionage raises $1.3 million to stitch India's EV chargers together

Ionage, an EV charging software firm, raised $1.3 million (about ₹12.4 crore) in pre-Series A funding on 7 October. It says it has onboarded more than 25,000 four-wheeler charge points and works with hardware making up over 70% of the installed base. Both figures are company claims. The round is small. The point is that the missing piece in Indian charging is interoperability, a software problem that cheap money can solve. One startup-funding tracker reports Indian cleantech raised a record $433 million in Q3 2026, about 69% of it in three EV rounds.

Number of the week: 88,397 rooftop installations in one quarter

Tata Power Solaroof completed 88,397 rooftop installations in July to September 2026, up 33% on a year earlier (about 66,500, derived from the stated growth). The quarter added 426 MWp, and the company's cumulative total is above 575,000 systems and 5.67 GWp. Industry body ISMA puts India's installed rooftop base at about 17 GW, so one installer accounts for roughly a third of it, though the two figures may not be counted the same way. Figures are company-reported.

The World

China finishes starting up a 700 MW salt-cavern air battery

China Huaneng and China Salt Group completed full-system startup of the Jintan compressed-air plant in Jiangsu on 12 September, reported this week. It has two 350 MW units and stores about 2.8 GWh across four salt caverns at roughly 1,000 metres, enough for four hours at full output. Project documents claim round-trip efficiency above 70% with no gas burned. Those are expected values, grid connection has not happened yet, and "largest salt-cavern plant" applies only to projects reported so far. Why it matters: it is long-duration storage that uses neither lithium nor a river.

China lists 5.5 GW of solar built to stop the desert moving

The Alxa League regulator in Inner Mongolia published an implementation list of five solar projects totalling 5.5 GW, covering about 14,667 hectares of sand control. Developers include CGN, POWERCHINA, China Huaneng and China Huadian. Panels shade and anchor soil while producing power. This is a list of planned projects under 2024 national rules, so it is an announcement. The test is whether the plants and the vegetation both survive five dry years.

US solar and storage spent about $19.5 billion in Q2

The Clean Air Task Force's analysis of Rhodium Group data, published 7 October, puts actual Q2 2026 spending at $11.94 billion on solar and $7.55 billion on storage, within $24.79 billion for clean electricity overall. EV battery manufacturing took about $4.8 billion. Part of the surge reflects a 4 July tax-credit begin-construction deadline that pulled spending forward, so Q3 may look quieter. These are modelled estimates, spread over construction periods.

Austria's last solar subsidy round drew 43,300 applications in 10 minutes

Austria's final 2026 funding round for rooftop solar and batteries opened on 8 October and the ministry reported about 43,300 applications within 10 minutes, against 24,900 in the summer round (preliminary figures). Officials call the first-come rush "absurd" and want to replace it with a year-round battery bonus tied to smart energy management and European-made inverters. Changes need a two-thirds parliamentary majority. Demand is real. The scheme design is the weak point.

Australia's rooftops set a 17.5 GW national record

Rooftop solar on Australia's main grid peaked at 17,488 MW at midday on 11 October, up 495 MW (2.9%) on the 20 September record. South Australia passed 2 GW for the first time (2,070 MW on 7 October). Figures come from an analyst's compilation of market data, as reported. The same sunny conditions set a Victorian renewable curtailment record of 5,709 MW, meaning generation switched off because the grid could not take it. Storage that can soak up midday output is the usual remedy.

The hard part

India: batteries get tendered faster than they get built. Industry body IESA data, reported this week, counts 24 GWh of battery projects cancelled or re-tendered between 2018 and 2026. In the past week alone, agencies floated roughly 20 GWh of new storage-linked procurement: SECI's 3,200 MWh standalone tender (1 October), NTPC REL's 12,000 MWh pumped hydro tender (5 October), and SECI's 4,800 MWh peak-supply tender (7 October). These differ in technology and timelines, but the pattern is plain. For a turnaround, awards would need to be backed by signed cell supply and financial closure before the letter of award, and agencies would need to publish how many awarded megawatt-hours reach commissioning. The ₹2.98 Chhattisgarh tariff will show whether low bids can be built.

India: a grid-cost rule slips again. CERC extended by six months a deviation settlement provision on allocating deficits in the pool account. Sub-clause (i) of Regulation 9(7) stays until 4 April 2027 and sub-clause (ii) applies from 5 April 2027. This is a reported summary of the order. Variable renewables raise imbalance costs, and someone must pay. Grid-India must finalise a recovery procedure before 4 April 2027, or the delay becomes permanent uncertainty.

World: US cancellations mount. In Q2, 26 solar projects worth $3.2 billion and 19 storage projects worth about $6.4 billion were cancelled, with Texas the worst hit. Air Products dropped a $7.1 billion Louisiana hydrogen complex. Developers handed back offshore wind leases in exchange for about $1.7 billion of reimbursements, partly redirected to fossil projects. SEIA counts 97 GW across 445 projects stuck in federal permitting. Reversal needs permits issued on a schedule, and Senate permitting text on wind and solar is still unresolved. Funding through 11 December is only a stopgap.

Worth watching

• 22 October and 3 November: NTPC REL's 2,000 MW/12,000 MWh pumped hydro tender holds its pre-bid meeting on 22 October, with bids due 3 November. Developers must start operating within 48 months of signing.

• 30 October: Bids close on SECI's ESS-IV standalone battery tender, carried over from last week's edition. Watch the winning tariffs against ₹2.98.

• 1 November: Austria's start date for systems invoiced or commissioned to qualify under the proposed 2027 battery bonus, which still needs a two-thirds parliamentary vote.

• 9 to 20 November: COP31 in Antalya, Türkiye, with a leaders' summit on 11 and 12 November (UNFCCC).

• 11 December: US government stopgap funding expires, a risk for energy programmes awaiting federal money.