a) Basis of preparation of Accounts
 
 The financial statements have been prepared to comply in all material
 respects with the accounting standards notified by the Companies
 Accounting Standards Rules, 2006 (as amended) and the relevant
 provisions of the Companies Act, 1956.  The financial statements have
 been prepared under the historical cost convention on an accrual basis,
 except for insurance and other claims which are accounted for on
 acceptance/actual receipt basis. The accounting policies adopted in the
 preparation of financial statements are consistent with those used in
 the previous year, except for ''b'' below.
 
 b) Change in accounting policy
 
 Presentation and disclosure of financial statements
 
 During the year ended 31 March 2012, the revised Schedule VI notified
 under the Companies Act 1956, has become applicable to the company, for
 preparation and presentation of its financial statements. The adoption
 of revised Schedule VI does not impact recognition and measurement
 principles followed for preparation of financial statements. However,
 it has significant impact on presentation and disclosures made in the
 financial statements. The company has also reclassified the previous
 year figures in accordance with the Revised Schedule VI requirements
 applicable in the current year.
 
 Change in Method of Valuation of Raw Material, Construction Material
 and Stores & Spares Parts During the year, the Company has implemented
 a new ERP system and thus changed its method of valuation of raw
 materials, construction materials and stores & spares parts inventories
 from First in First out to Weighted Average basis. Further, the
 management believes that such change in the method of valuation of
 inventories will result in a more appropriate presentation of these
 inventories and will give a systematic basis of charge for raw
 materials, construction materials and stores & spares parts consumption
 and would be more representative of the time pattern in which the
 economic benefits will be derived from the use of such inventories. Had
 the Company continued to use the earlier basis of valuation, the charge
 to statement of profit and loss for the year would have been lower by
 Rs 30.26 lacs and raw materials, construction materials and stores &
 spares parts inventories would have been higher by Rs 30.26 lacs.
 
 Foreign Currency Transactions
 
 Pursuant to the Companies (Accounting Standards) (Second Amendment)
 Rules, 2011 vide GSR 914(E) dated 29th December, 2011, the Company has
 exercised the option of capitalizing exchange differences, in respect
 of accounting periods commencing from 1st April, 2011, on long-term
 foreign currency monetary items which were hitherto recognized as
 income or expense in the period in which they arose. As a result, such
 exchange differences so far as they relate to the acquisition of a
 fixed asset are capitalized and depreciated over the remaining useful
 life of the asset. For this purpose, the company treats a foreign
 monetary item as long-term foreign currency monetary item, if it has
 a term of 12 months or more at the date of its origination.
 
 Exchange differences arising on other long-term foreign currency
 monetary items are accumulated in the Foreign Currency Monetary Item
 Translation Difference Account and amortized over the remaining life
 of the concerned monetary item
 
 Had the Company continued to use the earlier basis of recognizing
 exchange differences as income or as expenses in the period in which
 they arise, the charge to statement of profit and loss for the year on
 account of Foreign Exchange (Gain)/Loss would have been higher by
 Rs 43.62 lacs and Gross Block and Net Block of Tangible Fixed Assets
 would have been lower by Rs 43.62 lacs and Rs 39.06 lacs respectively.
 
 c) Use of estimates
 
 The preparation of financial statements in conformity with Indian GAAP
 requires the management to make judgments, estimates and assumptions
 that affect the reported amounts of revenues, expenses, assets and
 liabilities and disclosure of contingent liabilities, at the end of
 reporting period. Although these estimates are based upon the
 management''s best knowledge of current events and actions, uncertainty
 about these assumptions and estimates could result in the outcomes
 requiring a material adjustment to the carrying amounts of assets and
 liabilities in future periods.
 
 d) Tangible Fixed Assets
 
 Tangible Fixed assets are stated at cost of acquisition less
 accumulated depreciation and impairment loss, if any. Cost is inclusive
 of duties (net of CENVAT/VAT), taxes, incidental expenses,
 erection/commissioning expenses etc. incurred upto the date the asset
 is ready for its intended use.
 
 Machinery Spares which can be used only in connection with a particular
 item of Fixed Assets and whose use, as per the technical assessment, is
 expected to be irregular are capitalized and depreciated
 proportionately over the residual life of the respective assets
 
 From accounting periods commencing on or after 1st April, 2011, the
 company adjusts exchange differences arising on translation/settlement
 of long-term foreign currency monetary items pertaining to the
 acquisition of a depreciable asset to the cost of the asset and
 depreciates the same over the remaining life of the asset.
 
 e) Intangible Fixed Assets
 
 Intangible assets are carried at cost less accumulated amortization and
 impairment losses, if any.
 
 Computer softwares not being part of the hardware operating system are
 assessed to have a useful life of 3 years and are capitalized as
 intangible fixed assets.
 
 f) Depreciation & Amortization Tangible Fixed Assets
 
 i.  The classification of Plant and Machinery into continuous and
 non-continuous process is done as per technical certification and
 depreciation thereon is provided accordingly.
 
 ii.  Depreciation on tangible fixed assets except as mentioned below,
 is provided using the Straight Line Method at the rates and in the
 manner prescribed under Schedule XIV of the Companies Act, 1956 or at
 rates determined based on the useful life of Assets estimated by the
 management, whichever is higher.
 
 - Tangible fixed assets acquired up to March 31, 1991 and tangible
 fixed assets of the Wind Power Unit are depreciated at the rates
 specified in Schedule XIV of the Companies Act, 1956 using written down
 value method.
 
 - Steel Shutterings are depreciated over a period of five years on
 straight line method from the year of addition.
 
 iii. Depreciation on Insurance Spares/standby equipments is provided
 over the useful lives of the respective mother assets.
 
 iv.  Depreciation on fixed assets added/disposed off during the year,
 is provided on pro-rata basis with reference to the month of
 addition/disposal.
 
 Intangible Fixed Assets
 
 i.  Computer softwares capitalized as intangible fixed assets are
 amortized on a straight line basis over their useful life of 3 years.
 
 g) Impairment of tangible and intangible fixed assets
 
 The carrying amounts of assets are reviewed at each balance sheet date
 to determine if there is any indication of impairment based on
 internal/external factors. An impairment loss is recognized wherever
 the carrying amount of an asset exceeds its recoverable amount which is
 the greater of the asset''s net selling price and value in use. In
 assessing the value in use, the estimated future cash flows are
 discounted to their present value using a pre- tax discount rate that
 reflects current market assessments of the time value of money and
 risks specific to the assets.
 
 h) Leases
 
 Finance Leases, which effectively transfer to the Company,
 substantially, all the risks and benefits incidental to the ownership
 of the leased items, are capitalized at the lower of the fair value and
 present value of the minimum lease payment at the inception of lease
 term and disclosed as leased assets.
 
 Leases where the lessor effectively retains substantially all the risks
 and benefits of ownership of the leased assets, are classified as
 operating leases. Operating lease payments are recognized as an expense
 in the Statement of Profit and Loss on a straight-line basis over the
 lease term.
 
 i) Borrowing costs
 
 Borrowing cost includes interest, amortization of ancillary costs
 incurred in connection with the arrangement of borrowings and exchange
 differences arising from foreign currency borrowings to the extent they
 are regarded as an adjustment to the interest cost.
 
 Borrowing costs directly attributable to the acquisition, construction
 or production of an asset that necessarily takes a substantial period
 of time to get ready for its intended use or sale are capitalized as
 part of the cost of the respective asset.  All other borrowing costs
 are expensed in the period they occur.
 
 j) Investments
 
 Investments that are readily realisable and intended to be held for not
 more than a year from the date on which such investments are made are
 classified as current investments. All other investments are classified
 as long-term investments.  Long term investments are considered at
 cost, unless there is an other than temporary decline in value
 thereof, in which case, adequate provision for diminution is made in
 the financial statements. Current Investments are carried at lower of
 cost and fair value on an individual investment basis.
 
 k) Inventories
 
 (i) Closing stock of stores and spares and raw materials (except for
 those relating to construction activities) are valued at lower of cost
 computed on ''Weighted Average'' basis and net realizable value. However,
 materials and other supplies held for use in the production of
 inventories are not written down below cost if the finished products in
 which they will be incorporated are expected to be sold at or above
 cost. Cost includes expenses incidental to procurement thereof.
 
 (ii) Finished goods and work in progress (except for those relating to
 construction activities) are valued at the lower of cost (computed on
 weighted average basis) and net realizable value. Costs in respect of
 finished goods include direct material, labour and an appropriate
 portion of overhead costs and excise duty.
 
 (iii) Construction work in progress is valued at cost. However, in case
 of contracts where losses are likely to occur, the stock is considered
 at net ealized d value. Costs include materials, labour and an
 appropriate portion of construction overheads.
 
 (iv) Stores, components, etc. and construction materials at sites to be
 used in contracts are valued at cost which is ascertained on ''Weighted
 Average'' basis.
 
 (v) Net realizable value is the estimated selling price in the ordinary
 course of business, less estimated costs of completion and estimated
 costs necessary to make the sale.
 
 l) Revenue recognition
 
 (i) Construction contracts
 
 Revenue on contracts is recognised on percentage completion method
 based on the stage of completion of the contract. The stage of
 completion is determined as a proportion that contract costs incurred
 for work performed upto the reporting date bears to the estimated total
 costs. When it is probable that the total contract cost will exceed the
 total contract revenue, the expected loss is recognized immediately.
 For this purpose, total contract costs are ascertained on the basis of
 actual costs incurred and costs to be incurred for completion of
 contracts in progress, which is arrived at by the management based on
 current technical data, forecasts and estimate of expenditure to be
 incurred in future including contingencies, which being technical
 matters have been relied upon by the auditors.  Revisions in projected
 profit or loss arising from change in estimates are reflected in each
 accounting period which, however, cannot be disclosed separately in the
 financial statements as the effect thereof cannot be accurately
 determined.
 
 Overhead expenses representing indirect costs that cannot be directly
 aligned with the jobs, are distributed over the various contracts on a
 pro-rata basis.
 
 (ii) Sale of Goods
 
 Revenue from sale of goods is recognized on passage of title thereof to
 the customers, which generally coincides with delivery. Sales are net
 of taxes, returns, claims, trade discounts etc.
 
 Revenue is recognized when the significant risks and rewards of
 ownership of the goods get passed to the buyer.
 
 (iii) Income from Services
 
 Revenues from operation and maintenance contracts are recognised on
 rendering of services as per the terms of contract.
 
 (iv) Interest
 
 Interest is recognised on a time proportion basis taking into account
 the amount outstanding and the rate applicable.
 
 m) Foreign currency translations
 
 (i) Initial Recognition
 
 
 Foreign currency transactions are recorded in the reporting currency by
 applying to the foreign currency amount the exchange rate between the
 reporting currency and the foreign currency at the date of the
 transaction.
 
 (ii) Conversion
 
 Foreign currency monetary items are reported using the closing rate.
 Non-monetary items which are carried in terms of historical cost
 denominated in a foreign currency, are reported using the exchange rate
 at the date of the transaction and non-monetary items which are carried
 at fair value or other similar valuation denominated in a foreign
 currency are reported using the exchange rates that existed when the
 values were determined.
 
 (iii) Exchange Differences
 
 Exchange differences, in respect of accounting periods commencing from
 1st April 2011, arising on reporting of long- term foreign currency
 monetary items at rates different from those at which they were
 initially recorded during the period, or reported in previous financial
 statements, in so far as they relate to the acquisition of a
 depreciable capital asset, are added to or deducted from the cost of
 the asset (except for that part of exchange difference which is
 regarded as an adjustment to interest costs) and are depreciated over
 the balance life of the asset, and in other cases, such exchange
 differences are accumulated in a Foreign Currency Monetary Items
 Translation Difference Account and amortised over the balance period
 of such long-term asset/liability.
 
 Exchange differences arising on the settlement or reporting of monetary
 items, not covered above, at rates different from those at which they
 were initially recorded during the period, or reported in previous
 financial statements, are recognized as income or expenses in the
 period in which they arise.
 
 (iv) Forward Exchange Contracts not intended for trading or speculation
 purposes.
 
 The premium or discount arising at the inception of forward exchange
 contracts is amortized as expenses or income over the life of the
 respective contracts. Exchange differences on such contracts, except
 the contracts which are long term foreign currency monetary items, are
 recognized in the statement of profit and loss in the year in which the
 exchange rates change. Any profit or loss arising on cancellation or
 renewal of forward exchange contract is recognized as income or expense
 for the year. Any gain/loss arising on forward contracts which are long
 term foreign currency monetary items is recognized in accordance with
 paragraph 2 (m) (iii) above.
 
 (v) Derivatives Instruments:
 
 As per ICAI announcement, accounting for derivative contracts, other
 than those covered under AS-11, are marked to market on a portfolio
 basis, and the net loss after considering the offsetting effect on the
 underlying hedge item is charged to the statement of profit and loss.
 Net gains are ignored.
 
 (vi) Translation of Integral foreign operations
 
 The financial statements of an integral foreign operation are
 translated as if the transactions of the foreign operation have been
 those of the company itself.
 
 (vii) Translation of Non-integral foreign operations
 
 Exchange differences arising on a monetary item that, in substance,
 forms part of the company''s net investment in a non-integral foreign
 operation is accumulated in the foreign currency translation reserve
 until the disposal of the net investment. On the disposal of such net
 investment, the cumulative amount of the exchange differences which
 have been deferred and which relate to that investment is recognized as
 income or as expenses in the same period in which the gain or loss on
 disposal is recognized.
 
 n) Retirement and other employee benefits
 
 Retirement benefits in the form of Provident Fund being a defined
 contribution scheme, are charged to the Statement of Profit and Loss of
 the year when the contributions to the funds are due. There are no
 obligations other than the contribution payable to the fund.
 
 Gratuity (funded) being defined benefit obligations and long term
 compensated absences (unfunded) are provided for based on actuarial
 valuation made at the end of each financial year using the projected
 unit credit method.
 
 Actuarial gain and losses are recognized immediately in the Statement
 of Profit and Loss as income or expenses.  
 
 o) Income Taxes:
 
 Tax expense comprises of current and deferred income tax. Current
 income tax is measured at the amount expected to be paid to the tax
 authorities in accordance with the Indian Income Tax Act, 1961.
 Deferred taxes reflect the impact of current year timing differences
 between taxable income and accounting income for the year and reversal
 of timing differences of earlier years.
 
 Deferred tax is measured based on the tax rates and the tax laws
 enacted or substantively enacted at the balance sheet date. Deferred
 tax assets are recognised only to the extent that there is reasonable
 certainty that sufficient future taxable income will be available
 against which such deferred tax assets can be realised. In situations
 where the company has unabsorbed depreciation or carry forward tax
 losses, deferred tax assets are recognised only if there is virtual
 certainty supported by convincing evidence that such deferred tax
 assets can be realised against future taxable profits.
 
 The carrying amounts of deferred tax assets are reviewed at each
 Balance Sheet date. The company writes down the carrying amount of the
 deferred tax asset to the extent that it is no longer reasonably
 certain or virtually certain, as the case may be, that sufficient
 future taxable income will be available against which deferred tax
 assets can be realised. Any such write down is reversed to the extent
 it becomes reasonably certain or virtually certain, as the case may be,
 that sufficient future taxable income will be available.
 
 p) Employee Stock Compensation Cost
 
 Measurement and disclosure of the employee share-based payment plans is
 done in accordance with SEBI (Employee Stock Option Scheme and Employee
 Stock Purchase Scheme) Guidelines, 1999 and the Guidance Note on
 Accounting for Employee Share-based Payments, issued by the Institute
 of Chartered Accountants of India. The Company measures compensation
 cost relating to employee stock options using the intrinsic value
 method. Compensation expense is amortized over the vesting period of
 the option on a straight line basis.
 
 q) Segment Reporting
 
 Identification of Segments
 
 The Company has identified that its business segments are the primary
 segments. The Company''s businesses are organized and managed separately
 according to the nature of activity, with each segment representing a
 strategic business unit that offers different products and serves
 different markets. The analysis of geographical segments is based on
 the areas in which major operating divisions of the Company operate.
 
 Inter segment Transfers
 
 The Company generally accounts for intersegment sales and transfers as
 if the sales or transfers were to third parties at current market
 prices.
 
 Allocation of common costs
 
 Common allocable costs are allocated to each segment on case to case
 basis applying the ratio, appropriate to each relevant case. Revenue
 and expenses, which relate to the enterprise as a whole and are not
 allocable to segment on a reasonable basis, have been included under
 the head Unallocated - Common
 
 Segment Policies
 
 The accounting policies adopted for segment reporting are in line with
 those of the Company. 
 
 r) Earning Per Share
 
 Basic earning per share is calculated by dividing the net profit or
 loss for the period attributable to equity shareholders (after
 deducting preference dividends and attributable taxes) by the weighted
 average number of equity shares outstanding during the period.
 
 For the purpose of calculating diluted earnings per share, the net
 profit or loss for the period attributable to equity shareholders and
 the weighted average number of shares outstanding during the period are
 adjusted for the effects of all dilutive potential equity shares.
 
 s) Provisions
 
 A provision is recognized when an enterprise has a present obligation
 as a result of past event and it is probable that an outflow of
 resources will be required to settle the obligation, in respect of
 which a reliable estimate can be made.  Provisions made in terms of
 Accounting Standard 29 are not discounted to their present value and
 are determined based on management estimates required to settle the
 obligation at the balance sheet date. These are reviewed at each
 balance sheet date and appropriately adjusted to reflect the current
 management estimates.
 
 Provision for warranties cost is based on the claims received upto the
 year end as well as the management estimates of further liability to be
 incurred in this regard during the warranty period.
 
 t) Cash and Cash Equivalents
 
 Cash and cash equivalents as indicated in the Cash Flow Statement
 comprise of cash at bank and in hand and short-term investments with an
 original maturity of three months or less.
 
 u) Accounting for interests in joint ventures
 
 In respect of joint ventures entered into with other parties in the
 form of ''integrated joint ventures'', the accounting treatment is done
 as below in terms of Accounting Standard 27 notified by the Companies
 Accounting Standards Rules, 2006 (as amended) :
 
 (i) Company''s share in profits and losses is accounted for on
 determination of profits or losses by the Joint Ventures;
 
 (ii) Investments are carried at cost, net of the Company''s share of
 profits or losses, recognized in the accounts.  
 
 v) Measurement of EBIDTA
 
 As permitted by the Guidance Note on the Revised Schedule VI to the
 Companies Act, 1956, the company has elected to present earnings before
 finance costs, tax expenses, depreciation and amortization expenses
 (EBITDA) as a separate line item on the face of the statement of profit
 and loss. The company measures EBITDA on the basis of profit from
 continuing operations. In its measurement, the company does not include
 depreciation and amortization expenses, finance costs and tax expenses.
 
 * 200,000 (1,593,000) Compulsorily Convertible Preference shares of Rs
 140/- each have been converted in to 200,000 (1.593.000) Equity Shares
 of Rs 10/- each at a premium of Rs 130/- per equity share.
 
 ** Nil (200,000) Compulsorily Convertible Preference shares of Series A
 of Rs 160/- each have been converted in to Nil (200.000) Equity Shares
 of Rs 10/- each at a premium of Rs 150/- per equity share.
 
 *** 575,000 (1,775,000) convertible share warrants of Rs 140/- (600,000
 convertible share warrants of Rs 140/- and 1.175.000 convertible share
 warrants of Rs 160/-) each have been converted into 575,000 (1,775,000)
 equity shares of Rs 10/- each fully paid up at a premium of Rs 130/-
 per share (of Rs 130 on 600,000 equity shares and of Rs 150/- on
 1.175.000 equity shares) upon exercise of the option by the warrant
 holders.